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Andhare MG, Shetty S, Vivekanandan G, Shetty RM, Rahman B, Shetty SR, Siddeshappa ST, Desai V. Clinical efficacy of green tea, aloe vera and chlorhexidine mouthwashes in the treatment of dental biofilm induced gingivitis: A multi-arm, double-blinded, randomized controlled clinical trial. Int J Dent Hyg 2024; 22:504-513. [PMID: 36583292 DOI: 10.1111/idh.12664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 12/23/2022] [Accepted: 12/28/2022] [Indexed: 12/31/2022]
Abstract
OBJECTIVE This multi-arm, randomized, double-blinded, controlled clinical trial was designed to evaluate the clinical efficacy of 0.5% green tea (GT), 0.2% chlorhexidine (CHX) and aloe vera (AV) mouthwash as compared to the control (CNT) group (scaling and polishing alone with no mouthwash) in the management of dental biofilm induced gingivitis among 18-40-year-old patients. MATERIAL AND METHODS Sixty patients with generalized dental biofilm-induced gingivitis were randomly allocated to four study groups (n = 15 each) for treatment, namely Group GT, Group CHX, Group AV and Group CNT after scaling and polishing were administered to all the patients. Plaque index (PI), gingival index (GI) and sulcular bleeding index (SBI) were recorded at baseline, 14th and 21st day. RESULTS PI, GI and SBI at various time intervals (baseline, 14th and 21st day) showed high statistically significant differences within the group (p < 0.01). Among these, the maximum percentage change was found in the CHX group followed by GT when evaluated from baseline to 21st day. The least percentage change was found in the AV group for PI and GI while the CNT group showed the least percentage change for sulcular index when evaluated from 14th to 21st day. Inter-group results showed high statistically significant differences (p < 0.01) for PI and GI when evaluated between baseline to 14th day and baseline to 21st day. SBI also showed statistically significant differences (p < 0.05) when evaluated between baselines to 14th day and baseline to 21st day. CONCLUSION Green tea mouthwash displayed a significant reduction in plaque index, gingival index and sulcular bleeding index. 0.5% green tea catechin has equivalent anti-plaque efficacy as 0.2% chlorhexidine gluconate and can be considered a potent alternative to prevent and treat gingival diseases.
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Affiliation(s)
- Mangesh G Andhare
- Department of Periodontology, Aditya Dental College, Beed, Maharashtra, India
| | - Sunaina Shetty
- Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | - Gopinath Vivekanandan
- Department of Periodontology, Vananchal Dental College and Hospital, Garhwa, Jharkhand, India
| | - Raghavendra M Shetty
- Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman, UAE
- Center of Medical and Bio-allied Health Sciences Research, Ajman University, Ajman, UAE
- Department of Pediatric and Preventive Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research (Declared as Deemed-to-be University), Wardha, Maharashtra, India
| | - Betul Rahman
- Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | - Shishir R Shetty
- Department of Oral and Craniofacial Health Sciences, College of Dental Medicine, University of Sharjah, Sharjah, UAE
| | | | - Vijay Desai
- Department of Clinical Sciences, College of Dentistry, Ajman University, Ajman, UAE
- Center of Medical and Bio-allied Health Sciences Research, Ajman University, Ajman, UAE
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Si X, Yang J, Zhang F, Zhu R, Liu C, Jiang W, Shen Q, He P, Tang S, Li Z, Liu Z, You J, Di Z. Determination and Difference Analysis of Phenolic Compounds in Smokers' Saliva and Mainstream Smoke. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2022; 2022:6788394. [PMID: 36213091 PMCID: PMC9536968 DOI: 10.1155/2022/6788394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 09/06/2022] [Accepted: 09/12/2022] [Indexed: 06/16/2023]
Abstract
To study the differences in phenolic compounds between tobacco smokers' saliva and mainstream smoke, a method was developed for the analysis of 12 phenolic compounds in saliva and mainstream smoke based on ultrahigh-performance liquid chromatography with fluorescence detection (UPLC-FLD). The contents and distributions of phenolic compounds in tobacco smokers' saliva and mainstream smoke were compared. The results were as follows: (1) Phenolic compounds were quantitatively analyzed by the internal standard method using 4-fluorophenol as an internal standard. For smokers' saliva samples, the limits of quantification (LOQs) ranged from 2.2 to 19.1 μg/L, and the recoveries were from 80.2% to 119.2% at the three spiked levels. For mainstream smoke samples, the LOQs ranged from 0.03 to 0.26 μg/cig, and the recoveries ranged from 84.9% to 107.0% at the three spiked levels. (2) The contents of phenolic compounds from 14 cigarettes in mainstream smoke and smokers' saliva were determined. In mainstream smoking, the main phenolic compounds were hydroquinone, catechol, phenol, meta- and para-Cresol, and o-methylhydroquinone. In smokers' saliva, the main phenolic compounds were phenol and meta- and para-Cresol and the contents of phenolic compounds in smokers' saliva from different cigarettes were significantly different. (3) The content distribution patterns of phenolic compounds in smokers' saliva differed from those in mainstream smoke. The predominant phenolic compound in mainstream smoke was dihydroxybenzene, while monophenols predominated in smokers' saliva. (4) The contents of phenolic compounds from five kinds of cigarettes were analyzed in the saliva of different smokers using principal component analysis, which indicated that cigarettes with different sensory effects were clearly distinguished by differences in the contents of phenolic compounds in saliva.
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Affiliation(s)
- Xiaoxi Si
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
- Faculty of Environmental Science & Engineering, Kunming University of Science and Technology, Kunming 650500, China
| | - Jianyun Yang
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Fengmei Zhang
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Ruizhi Zhu
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Chunbo Liu
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Wei Jiang
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Qingpeng Shen
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Pei He
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Shiyun Tang
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Zhenjie Li
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Zhihua Liu
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Junheng You
- Yunnan Key Laboratory of Tobacco Chemistry, R&D Center of China Tobacco Yunnan Industrial Co. Ltd., Kunming 650231, China
| | - Zhang Di
- Faculty of Environmental Science & Engineering, Kunming University of Science and Technology, Kunming 650500, China
- School of Resources and Environment, Linyi University, Linyi 276005, China
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Ishimoto K, Hatanaka N, Otani S, Maeda S, Xu B, Yasugi M, Moore JE, Suzuki M, Nakagawa S, Yamasaki S. Tea crude extracts effectively inactivate severe acute respiratory syndrome coronavirus 2. Lett Appl Microbiol 2021; 74:2-7. [PMID: 34695222 PMCID: PMC8661916 DOI: 10.1111/lam.13591] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/03/2021] [Accepted: 10/19/2021] [Indexed: 12/29/2022]
Abstract
It is well known that black and green tea extracts, particularly polyphenols, have antimicrobial activity against various pathogenic microbes including viruses. However, there is limited data on the antiviral activity against severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2), which emerged rapidly in China in late 2019 and which has been responsible for coronavirus disease 2019 (COVID‐19) pandemic globally. In this study, 20 compounds and three extracts were obtained from black and green tea and found that three tea extracts showed significant antiviral activity against SARS‐CoV‐2, whereby the viral titre decreased about 5 logs TCID50 per ml by 1·375 mg ml−1 black tea extract and two‐fold diluted tea bag infusion obtained from black tea when incubated at 25°C for 10 s. However, when concentrations of black and green tea extracts were equally adjusted to 344 µg ml−1, green tea extracts showed more antiviral activity against SARS‐CoV‐2. This simple and highly respected beverage may be a cheap and widely acceptable means to reduce SARS‐CoV‐2 viral burden in the mouth and upper gastrointestinal and respiratory tracts in developed as well as developing countries.
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Affiliation(s)
- K Ishimoto
- Laboratory of Innovative Food Science, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan.,Global Center for Medical Engineering and Informatic, Osaka University, Osaka, Japan
| | - N Hatanaka
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, Japan.,Asian Health Science Research Institute, Osaka Prefecture University, Izumisano, Osaka, Japan.,Osaka International Research Center for Infectious Diseases, Osaka Prefecture University, Izumisano, Osaka, Japan
| | - S Otani
- Laboratory of Innovative Food Science, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan.,R&D Group, Mitsui Norin Co. Ltd, Fujieda, Shizuoka, Japan
| | - S Maeda
- Laboratory of Innovative Food Science, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan.,R&D Group, Mitsui Norin Co. Ltd, Fujieda, Shizuoka, Japan
| | - B Xu
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, Japan
| | - M Yasugi
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, Japan.,Asian Health Science Research Institute, Osaka Prefecture University, Izumisano, Osaka, Japan.,Osaka International Research Center for Infectious Diseases, Osaka Prefecture University, Izumisano, Osaka, Japan
| | - J E Moore
- Northern Ireland Public Health Laboratory, Nightingale (Belfast City) Hospital, Belfast, UK
| | - M Suzuki
- Laboratory of Innovative Food Science, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan.,R&D Group, Mitsui Norin Co. Ltd, Fujieda, Shizuoka, Japan
| | - S Nakagawa
- Laboratory of Innovative Food Science, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan.,Global Center for Medical Engineering and Informatic, Osaka University, Osaka, Japan.,Laboratory of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
| | - S Yamasaki
- Department of Veterinary Science, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, Japan.,Asian Health Science Research Institute, Osaka Prefecture University, Izumisano, Osaka, Japan.,Osaka International Research Center for Infectious Diseases, Osaka Prefecture University, Izumisano, Osaka, Japan
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Abstract
Background Catechins, which are polyphenol compounds found in many plants and are an important component of tea leaves, are strong anti-oxidants. Research Many studies seek to enhance the effects of catechins on the human body and boost their protective power against UV radiation. There are many examples of the positive anti-microbial, anti-viral, anti-inflammatory, anti-allergenic, and anti-cancer effects of catechins. Catechins increase the penetration and absorption of healthy functional foods and bio cosmetics into the body and the skin, thus improving their utility. High value-added anti-oxidant substances have been extracted from food and plant sludge, and experiments have shown that catechins are safe when applied to the human body. The stability of catechins is very important for their absorption into the human body and the effectiveness of their anti-oxidant properties. Conclusion Continued research on the strong anti-oxidant effects of catechins is expected to result in many advances in the food, cosmetics, and pharmaceutical industries.
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Gul P, Akgul N, Seven N. Anticariogenic potential of white cheese, xylitol chewing gum, and black tea. Eur J Dent 2019; 12:199-203. [PMID: 29988210 PMCID: PMC6004802 DOI: 10.4103/ejd.ejd_4_18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Objective This study aimed to examine the effects of these foods on plaque pH and the potential development of tooth decay. Materials and Methods Plaque pH was measured using the sampling method before and after 1, 5, 10, 20, 30, 45, and 60 min following consumption of these foods individually and after rinsing with a 10% sucrose solution. Statistical analysis was performed using one-way ANOVA and Tukey honestly significant difference post hoc tests (α = 0.05). Results Although there were statistically significant differences in all test groups except the BT (P = 0.620) and sucrose + XCG (P = 0.550) groups in time, none of the participants chosen for this study were having a plaque pH value anywhere close to the critical value (pH = 5.5). Conclusion WC, BT, and XCG are advisable as anticariogenic foods because pH values are not below critical value.
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Affiliation(s)
- Pinar Gul
- Department of Restorative Dentistry, Faculty of Dentistry, Atatürk University, Erzurum, Turkye
| | - Nilgun Akgul
- Department of Restorative Dentistry, Faculty of Dentistry, Atatürk University, Erzurum, Turkye
| | - Nilgun Seven
- Department of Restorative Dentistry, Faculty of Dentistry, Atatürk University, Erzurum, Turkye
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6
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Fernando WMADB, Somaratne G, Goozee KG, Williams S, Singh H, Martins RN. Diabetes and Alzheimer's Disease: Can Tea Phytochemicals Play a Role in Prevention? J Alzheimers Dis 2018; 59:481-501. [PMID: 28582855 DOI: 10.3233/jad-161200] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Dementia and diabetes mellitus are prevalent disorders in the elderly population. While recognized as two distinct diseases, diabetes has more recently recognized as a significant contributor to risk for developing dementia, and some studies make reference to type 3 diabetes, a condition resulting from insulin resistance in the brain. Alzheimer's disease, the most common form of dementia, and diabetes, interestingly, share underlying pathological processes, commonality in risk factors, and, importantly, pathways for intervention. Tea has been suggested to possess potent antioxidant properties. It is rich in phytochemicals including, flavonoids, tannins, caffeine, polyphenols, boheic acid, theophylline, theobromine, anthocyanins, gallic acid, and finally epigallocatechin-3-gallate, which is considered to be the most potent active ingredient. Flavonoid phytochemicals, known as catechins, within tea offer potential benefits for reducing the risk of diabetes and Alzheimer's disease by targeting common risk factors, including obesity, hyperlipidemia, hypertension, cardiovascular disease, and stroke. Studies also show that catechins may prevent the formation of amyloid-β plaques and enhance cognitive functions, and thus may be useful in treating patients who have Alzheimer's disease or dementia. Furthermore, other phytochemicals found within tea offer important antioxidant properties along with innate properties capable of modulating intracellular neuronal signal transduction pathways and mitochondrial function.
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Affiliation(s)
- Warnakulasuriya M A D B Fernando
- Centre of Excellence in Alzheimer's Disease Research and Care, School of Medical Sciences, Edith Cowan University, Joondalup, Australia
| | - Geeshani Somaratne
- Massey Institute of Food Science and Technology, Massey University, Palmerston North, New Zealand.,Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Kathryn G Goozee
- Centre of Excellence in Alzheimer's Disease Research and Care, School of Medical Sciences, Edith Cowan University, Joondalup, Australia.,School of Biomedical Science, Macquarie University, Sydney, NSW, Australia.,KARVIAH Research Centre, Anglicare, Castle Hill, NSW, Australia.,School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Nedlands, WA, Australia.,Department of Biomedical Sciences, Macquarie University, Sydney, NSW, Australia.,KaRa Institute of Neurological Diseases, Sydney, NSW, Australia
| | - Shehan Williams
- Faculty of Medicine, University of Kelaniya, Colombo, Sri Lanka
| | - Harjinder Singh
- Massey Institute of Food Science and Technology, Massey University, Palmerston North, New Zealand.,Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Ralph N Martins
- Centre of Excellence in Alzheimer's Disease Research and Care, School of Medical Sciences, Edith Cowan University, Joondalup, Australia.,School of Biomedical Science, Macquarie University, Sydney, NSW, Australia.,KARVIAH Research Centre, Anglicare, Castle Hill, NSW, Australia.,School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Nedlands, WA, Australia.,Department of Biomedical Sciences, Macquarie University, Sydney, NSW, Australia.,KaRa Institute of Neurological Diseases, Sydney, NSW, Australia
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7
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Lin C, Xia G, Liu S. Modeling and comparison of extraction kinetics of 8 catechins, gallic acid and caffeine from representative white teas. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2017.04.028] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Cires MJ, Wong X, Carrasco-Pozo C, Gotteland M. The Gastrointestinal Tract as a Key Target Organ for the Health-Promoting Effects of Dietary Proanthocyanidins. Front Nutr 2017; 3:57. [PMID: 28097121 PMCID: PMC5206694 DOI: 10.3389/fnut.2016.00057] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Accepted: 12/13/2016] [Indexed: 12/11/2022] Open
Abstract
Proanthocyanidins (PACs) are polymers of flavan-3-ols abundant in many vegetable foods and beverages widely consumed in the human diet. There is increasing evidence supporting the beneficial impact of dietary PACs in the prevention and nutritional management of non-communicable chronic diseases. It is considered that PACs with a degree of polymerization >3 remain unabsorbed in the gastrointestinal (GI) tract and accumulate in the colonic lumen. Accordingly, the GI tract may be considered as a key organ for the healthy-promoting effects of dietary PACs. PACs form non-specific complexes with salivary proteins in mouth, originating the sensation of astringency, and with dietary proteins, pancreatic enzymes, and nutrient transporters in the intestinal lumen, decreasing the digestion and absorption of carbohydrates, proteins, and lipids. They also exert antimicrobial activities, interfering with cariogenic or ulcerogenic pathogens in the mouth (Streptococcus mutans) and stomach (Helicobacter pylori), respectively. Through their antioxidant and antiinflammatory properties, PACs decrease inflammatory processes in animal model of gastric and colonic inflammation. Interestingly, they exert prebiotic activities, stimulating the growth of Lactobacillus spp. and Bifidobacterium spp. as well as some butyrate-producing bacteria in the colon. Finally, PACs are also metabolized by the gut microbiota, producing metabolites, mainly aromatic acids and valerolactones, which accumulate in the colon and/or are absorbed into the bloodstream. Accordingly, these compounds could display biological activities on the colonic epithelium or in extra-intestinal tissues and, therefore, contribute to part of the beneficial effects of dietary PACs.
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Affiliation(s)
- María José Cires
- Faculty of Medicine, Department of Nutrition, University of Chile , Santiago , Chile
| | - Ximena Wong
- Faculty of Medicine, Department of Nutrition, University of Chile , Santiago , Chile
| | | | - Martin Gotteland
- Faculty of Medicine, Department of Nutrition, University of Chile, Santiago, Chile; Institute of Nutrition and Food Technology (INTA), University of Chile, Santiago, Chile
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Membrane Interactions of Phytochemicals as Their Molecular Mechanism Applicable to the Discovery of Drug Leads from Plants. Molecules 2015; 20:18923-66. [PMID: 26501254 PMCID: PMC6332185 DOI: 10.3390/molecules201018923] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 10/11/2015] [Accepted: 10/14/2015] [Indexed: 02/02/2023] Open
Abstract
In addition to interacting with functional proteins such as receptors, ion channels, and enzymes, a variety of drugs mechanistically act on membrane lipids to change the physicochemical properties of biomembranes as reported for anesthetic, adrenergic, cholinergic, non-steroidal anti-inflammatory, analgesic, antitumor, antiplatelet, antimicrobial, and antioxidant drugs. As well as these membrane-acting drugs, bioactive plant components, phytochemicals, with amphiphilic or hydrophobic structures, are presumed to interact with biological membranes and biomimetic membranes prepared with phospholipids and cholesterol, resulting in the modification of membrane fluidity, microviscosity, order, elasticity, and permeability with the potencies being consistent with their pharmacological effects. A novel mechanistic point of view of phytochemicals would lead to a better understanding of their bioactivities, an insight into their medicinal benefits, and a strategic implication for discovering drug leads from plants. This article reviews the membrane interactions of different classes of phytochemicals by highlighting their induced changes in membrane property. The phytochemicals to be reviewed include membrane-interactive flavonoids, terpenoids, stilbenoids, capsaicinoids, phloroglucinols, naphthodianthrones, organosulfur compounds, alkaloids, anthraquinonoids, ginsenosides, pentacyclic triterpene acids, and curcuminoids. The membrane interaction’s applicability to the discovery of phytochemical drug leads is also discussed while referring to previous screening and isolating studies.
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10
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Ribeiro PRDS, Duarte RM. Development and validation of a simple spectrophotometric method for the determination of methyldopa in both bulk and marketed dosage formulations. BRAZ J PHARM SCI 2014. [DOI: 10.1590/s1984-82502014000300017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A simple, precise, sensitive, rapid, specific and economical spectrophotometric method was developed to determine methyldopa (MTD) content in bulk and pharmaceutical dosage formulations. The proposed method was based on the formation of a colored product from the nitrosation reaction of MTD with sodium nitrite in an acid medium. The resultant nitroso derivative species reacts further with sodium hydroxide and is converted it into a more stable compound. This yellow nitrosation product exhibited an absorption maximum at 430 nm. Beer's Law was obeyed in a concentration range of 6.37 to 82.81 μg mL-1 MTD with an excellent coefficient of determination (R2 = 0.9998). No interference was observed from common excipients in formulations. The results showed the method to be simple, accurate and readily applied for the determination of MTD in pure form and in pharmaceutical preparations. The analytical results obtained for these products using the proposed method are in agreement with those of the Brazilian Pharmacopoeia procedure at a 95% confidence level.
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11
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Ananingsih VK, Sharma A, Zhou W. Green tea catechins during food processing and storage: A review on stability and detection. Food Res Int 2013. [DOI: 10.1016/j.foodres.2011.03.004] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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12
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Zumdick S, Deters A, Hensel A. In vitro intestinal transport of oligomeric procyanidins (DP 2 to 4) across monolayers of Caco-2 cells. Fitoterapia 2012; 83:1210-7. [DOI: 10.1016/j.fitote.2012.06.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 06/28/2012] [Accepted: 06/30/2012] [Indexed: 02/04/2023]
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13
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Application of ionic liquid for extraction and separation of bioactive compounds from plants. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 904:1-21. [DOI: 10.1016/j.jchromb.2012.07.020] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 07/06/2012] [Accepted: 07/16/2012] [Indexed: 12/17/2022]
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14
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Neilson AP, Ferruzzi MG. Influence of formulation and processing on absorption and metabolism of flavan-3-ols from tea and cocoa. Annu Rev Food Sci Technol 2012; 2:125-51. [PMID: 22129378 DOI: 10.1146/annurev-food-022510-133725] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Flavan-3-ols are a major subclass of the class of plant phytochemicals known as flavonoids. Flavan-3-ols are commonly found in fruit, vegetable, and botanical products, including tea, cocoa, grapes, and apples. Both monomeric catechins and polymeric procyanidins are common in the diet, along with several derivatives produced by degradation of these species during processing. Both epidemiological and biological evidence suggests a health-protective role for dietary flavan-3-ols, leading to increased interest in the bioavailability of these compounds from foods. Flavan-3-ol bioavailability depends on numerous factors, including digestive release, absorption, metabolism, and elimination. In addition to these in vivo factors, the complexity of whole-food systems (physical form, flavan-3-ol form and dose, macronutrient and micronutrient profile, processing, etc.) influences the absorption efficiency and circulating profile of flavan-3-ols. An understanding of how food matrices may influence flavan-3-ol absorption will provide a framework to design and develop functional products that positively affect flavan-3-ol absorption and, by extension, potential bioactivity.
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Affiliation(s)
- Andrew P Neilson
- Department of Family Medicine, University of Michigan, Ann Arbor, Michigan 48109, USA
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15
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Awadalla HI, Ragab MH, Bassuoni MW, Fayed MT, Abbas MO. A pilot study of the role of green tea use on oral health. Int J Dent Hyg 2011; 9:110-6. [PMID: 21356006 DOI: 10.1111/j.1601-5037.2009.00440.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
UNLABELLED INTRODUCTION An increasing number of people all around the world are turning to the nature by using the natural herbal products in both prophylaxes and treatment of different diseases. Green tea with active chemical ingredients posses diverse pharmacological properties that include anti-inflammatory, anticariogenic, antioxidant and antibacterial effects. AIMS To assess the possible protective properties of green tea on oral health. METHODS The researchers used the following measurements: Streptococcus mutans count in saliva and plaque, Salivary and plaque pH values, Gingival Bleeding Index (GBI). The above-mentioned measurements were applied to a sample consists of 25 subjects before and after rinsing with green tea for 5 min (short-term study). While, S. mutans count for saliva and plaque and GBI measurements, this experimental intervention study was carried out in the El-Azhar University dental clinic. RESULTS The results of this study showed that there was a statistically significant difference among subjects pre- and post-rinsing with 2% green tea for 5 min concerning S. mutans count in saliva and plaque, salivary and plaque pH values and GBI. CONCLUSION This study supports the effectiveness of local application of green tea as antibacterial and anticariogenic material as it decreases the acidity of the saliva and plaque, so it is a cost-effective caries prevention measures especially in developing countries.
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Affiliation(s)
- H I Awadalla
- Institute of Environmental Studies and Research, Ain Shams University, Cairo, Egypt
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16
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Russo M, Cacciola F, Bonaccorsi I, Dugo P, Mondello L. Determination of flavanones in Citrus
juices by means of one- and two-dimensional liquid chromatography. J Sep Sci 2011; 34:681-7. [DOI: 10.1002/jssc.201000844] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 12/30/2010] [Accepted: 12/30/2010] [Indexed: 12/30/2022]
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17
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Grünhut M, Martins VL, Centurión ME, Ugulino Araújo MC, Band BSF. Flow-Batch Analyzer for the Chemiluminescence Determination of Catecholamines in Pharmaceutical Preparations. ANAL LETT 2011. [DOI: 10.1080/00032719.2010.500765] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Kahle K, Kempf M, Schreier P, Scheppach W, Schrenk D, Kautenburger T, Hecker D, Huemmer W, Ackermann M, Richling E. Intestinal transit and systemic metabolism of apple polyphenols. Eur J Nutr 2010; 50:507-22. [DOI: 10.1007/s00394-010-0157-0] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2010] [Accepted: 12/05/2010] [Indexed: 01/23/2023]
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19
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Dugo P, Kumm T, Cacciola F, Dugo G, Mondello L. Multidimensional Liquid Chromatographic Separations Applied to the Analysis of Food Samples. J LIQ CHROMATOGR R T 2010. [DOI: 10.1080/10826070802128888] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- P. Dugo
- a Dipartimento di Scienze degli Alimenti e dell'Ambiente, Facoltà di Scienze MM.FF.NN. , Università di Messina , Salita Sperone, 98166, Messina, Italy
| | - T. Kumm
- b Dipartimento Farmaco-chimico, Facoltà di Farmacia , Università di Messina , Messina, Italy
| | - F. Cacciola
- b Dipartimento Farmaco-chimico, Facoltà di Farmacia , Università di Messina , Messina, Italy
| | - G. Dugo
- b Dipartimento Farmaco-chimico, Facoltà di Farmacia , Università di Messina , Messina, Italy
| | - L. Mondello
- b Dipartimento Farmaco-chimico, Facoltà di Farmacia , Università di Messina , Messina, Italy
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20
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Kartsova LA, Alekseeva AV. Chromatographic and electrophoretic methods for determining polyphenol compounds. JOURNAL OF ANALYTICAL CHEMISTRY 2008. [DOI: 10.1134/s1061934808110026] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Hájek T, Škeříková V, Česla P, Vyňuchalová K, Jandera P. Multidimensional LC×LC analysis of phenolic and flavone natural antioxidants with UV-electrochemical coulometric and MS detection. J Sep Sci 2008; 31:3309-28. [DOI: 10.1002/jssc.200800249] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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22
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Shaikh SMT, Manjunatha DH, Harikrishna K, Ramesh KC, Kumar RS, Seetharamappa J. Diazocoupling reaction for the spectrophotometric determination of physiologically active catecholamines in bulk and pharmaceutical preparations. JOURNAL OF ANALYTICAL CHEMISTRY 2008. [DOI: 10.1134/s106193480807006x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Tsuchiya H, Tanaka T, Nagayama M. Antiproliferative Effects Associated with Membrane Lipid Interaction of Green Tea Catechins. ACTA ACUST UNITED AC 2008. [DOI: 10.1248/jhs.54.576] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hironori Tsuchiya
- Department of Dental Basic Education, Asahi University School of Dentistry
| | - Toshiyuki Tanaka
- Laboratory of Medicinal Resources, Gifu Pharmaceutical University
| | - Motohiko Nagayama
- Department of Dental Basic Education, Asahi University School of Dentistry
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24
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Cacciola F, Jandera P, Mondello L. Comparison of High-Temperature Gradient Heart-Cutting and Comprehensive LC × LC Systems for the Separation of Phenolic Antioxidants. Chromatographia 2007. [DOI: 10.1365/s10337-007-0379-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Cacciola F, Jandera P, Mondello L. Temperature effects on separation on zirconia columns: Applications to one- and two-dimensional LC separations of phenolic antioxidants. J Sep Sci 2007; 30:462-74. [PMID: 17444215 DOI: 10.1002/jssc.200600387] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The effects of temperature and mobile phase on LC chromatographic separation of phenolic antioxidants on zirconia-based columns were investigated. Unlike silica-based materials, zirconia columns show excellent thermal stability over a wide range of temperatures and enable high-temperature separations. Enthalpic and entropic contributions to the retention of phenolic compounds on ZR-Carbon and ZR-Carbon C18 columns were determined from retention versus temperature plots in order to elucidate the retention mechanism of sample compounds over the temperature range up to 14 degrees C. High-temperature liquid chromatography on ZR-Carbon columns was used for comprehensive LC x LC two-dimensional separation systems based on the different selectivity of a Zorbax SB micro-column used in the first dimension and a ZR-Carbon column used in the second dimension. Two-dimensional LC x LC systems employing a setup with two alternately operated parallel ZR-Carbon columns in the second dimension were used for the analysis of phenolic antioxidants in beer and wine samples.
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Affiliation(s)
- Francesco Cacciola
- Department of Analytical Chemistry, University of Pardubice, Pardubice, Czech Republic
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26
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Robb CS, Geldart SE, Seelenbinder JA, Brown PR. ANALYSIS OF GREEN TEA CONSTITUENTS BY HPLC-FTIR. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-120003036] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Christina. S. Robb
- a Department of Chemistry , University of Rhode Island , Kingston, RI, 02881, U.S.A
| | - Susan E. Geldart
- a Department of Chemistry , University of Rhode Island , Kingston, RI, 02881, U.S.A
| | | | - Phyllis R. Brown
- a Department of Chemistry , University of Rhode Island , Kingston, RI, 02881, U.S.A
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27
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Laurent C, Besançon P, Caporiccio B. Flavonoids from a grape seed extract interact with digestive secretions and intestinal cells as assessed in an in vitro digestion/Caco-2 cell culture model. Food Chem 2007. [DOI: 10.1016/j.foodchem.2005.10.016] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Cacciola F, Jandera P, Blahová E, Mondello L. Development of different comprehensive two dimensional systems for the separation of phenolic antioxidants. J Sep Sci 2006; 29:2500-13. [PMID: 17154131 DOI: 10.1002/jssc.200600213] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Three different comprehensive 2-D HPLC systems for the separation of phenolic antioxidants have been developed on the basis of different selectivities of a PEG-silica column in the first dimension and a packed or monolithic C18 or a ZR-CARBON column, respectively, in the second dimension. Two-dimensional comprehensive liquid chromatography using a serially connected short PEG-silica column and a conventional C18-silica or a ZR-CARBON column in the second dimension was tested to improve the resolution of the earlier eluting compounds in the first dimension. Various types of interface were used to connect the columns in the first and in the second dimension: i) two injection sampling loops of 100 microL in conventional arrangement; ii) a 10-port 2-position valve equipped with two trapping X-Terra columns instead of loops; and iii) two analytical D2 columns in parallel. The mobile phase in the first dimension has a lower elution strength than in the second dimension, allowing band compression of the solutes transferred from the first to the second dimension. This effect was enhanced using trapping columns instead of sampling loops as the interface between the two dimensions, thus allowing a decrease in the time of analysis. These systems were used for the analysis of beer samples. The relative location of the components in the 2-D retention plane varied in relation to their chemical structure in each instrumental set-up and allowed positive peak identification.
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Affiliation(s)
- Francesco Cacciola
- Department of Analytical Chemistry, University of Pardubice, Pardubice, Czech Republic
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29
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Long H, Zhu Y, Huang T, Coury LA, Kissinger PT. IDENTIFICATION AND DETERMINATION OF POLYPHENOLS IN TEA BY LIQUID CHROMATOGRAPHY WITH MULTI-CHANNEL ELECTROCHEMICAL DETECTION. J LIQ CHROMATOGR R T 2006. [DOI: 10.1081/jlc-100103434] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Hong Long
- a Bioanalytical Systems, Inc. , 2701 Kent Avenue, West Lafayette, IN, 47906, U.S.A
| | - Yongxin Zhu
- a Bioanalytical Systems, Inc. , 2701 Kent Avenue, West Lafayette, IN, 47906, U.S.A
| | - Tiehua Huang
- a Bioanalytical Systems, Inc. , 2701 Kent Avenue, West Lafayette, IN, 47906, U.S.A
| | - L. A. Coury
- a Bioanalytical Systems, Inc. , 2701 Kent Avenue, West Lafayette, IN, 47906, U.S.A
| | - Peter T. Kissinger
- b Bioanalytical Systems, Inc. , 2701 Kent Avenue, West Lafayette, IN, 47906, U.S.A
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30
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Blahová E, Jandera P, Cacciola F, Mondello L. Two-dimensional and serial column reversed-phase separation of phenolic antioxidants on octadecyl-, polyethyleneglycol-, and pentafluorophenylpropyl-silica columns. J Sep Sci 2006; 29:555-66. [PMID: 16583694 DOI: 10.1002/jssc.200500375] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The separation selectivity of octadecyl-silica (C18) and of bonded pentafluorophenylpropyl-silica (F5) and PEG-silica columns was compared for natural phenolic antioxidants. The separation selectivities for phenolic antioxidants on C18 and F5 columns are strongly correlated, but low selectivity correlation indicating strong differences in the retention mechanism was observed between the C18 and PEG columns. Hence, the combination of a C18 and a PEG column is useful for separation of phenolic antioxidants that are not fully separated on single columns. Two-dimensional comprehensive liquid chromatography using a short PEG-silica column in the first dimension and a conventional C18-silica in the second dimension has the advantage of on-column focusing of the fractions transferred onto the C18 column in the second dimension, as a weaker mobile phase is used in the first dimension than in the second dimension. However, a stop-flow set-up in the first dimension system is necessary after the transfer of each fraction to the second dimension. Peak capacity is considerably larger but the separation time is much longer than with serially coupled PEG and C18 columns, which were employed for separation of beer and hop extract samples in connection with coulometric detection.
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Affiliation(s)
- Eva Blahová
- Department of Analytical Chemistry, University of Pardubice, Pardubice, Czech Republic
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31
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Ribeiro PRS, Pezza L, Pezza HR. Spectrophotometric determination of methyldopa in pharmaceutical formulations. ECLÉTICA QUÍMICA 2005. [DOI: 10.1590/s0100-46702005000300003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new, simple, precise, rapid and low-cost spectrophotometric method for methyldopa determination in pharmaceutical preparations is described. This method is based on the complexation reaction of methyldopa with molybdate. Absorbance of the resulting yellow coloured product is measured at 410 nm. Beer's Law is obeyed in a concentration range of 50 - 200 µg ml-1 methyldopa with an excellent correlation coefficient (r = 0.9999). No interference was observed from common excipients in formulations. The results show a simple, accurate, fast and readily applied method to the determination of methyldopa in pharmaceutical products. The analytical results obtained for these products by the proposed method are in agreement with those of the Brazilian Pharmacopoeia procedure at 95% confidence level.
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32
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Jandera P, Skeifíková V, Rehová L, Hájek T, Baldriánová L, Skopová G, Kellner V, Horna A. RP-HPLC analysis of phenolic compounds and flavonoids in beverages and plant extracts using a CoulArray detector. J Sep Sci 2005; 28:1005-22. [PMID: 16013828 DOI: 10.1002/jssc.200500003] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Methods were developed for the analysis of natural antioxidants including phenolic compounds and flavonoids in beverages and plant extracts using gradient HPLC with multi-channel electrochemical coulometric detection. Suitability of various reversed-phase columns for this purpose was compared; pH and mobile phase gradients were optimized with respect to the separation selectivity and sensitivity of detection. Because of different target compounds in various sample types, the overlapping resolution maps and the normalized resolution product approaches described earlier were used to select optimum columns and gradients to suit the analysis of the individual sample types. The methods were applied to the analysis of phenolic compounds and flavonoids in beer, wine, tea, and yacon extracts. 32 phenolic compounds were identified and determined, including derivatives of benzoic and cinnamic acids, flavones, and a few related glycosides. Eight-channel CoulArray detection offers high selectivity and sensitivity with limits of detection in the low microg L(-1) range, at least an order of magnitude lower than single-channel coulometric detection using the Coulochem detector. No special sample pretreatment is necessary and, because of the compatibility of the CoulArray detector with gradient elution, phenolic antioxidants of different polarities can be determined in a single run. In addition to the retention times, the ratios of the areas of the pre-dominant and post-dominant peaks to the area of the dominant peak can be used for improved identification of natural antioxidants.
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Affiliation(s)
- Pavel Jandera
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, nám. Cs. Legií 565, CZ-532 10 Pardubice, Czech Republic.
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33
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Sladkovský R, Solich P, Urbánek M. High-performance liquid chromatography determination of phenolic components in wine using off-line isotachophoretic pretreatment. J Chromatogr A 2005; 1040:179-84. [PMID: 15230524 DOI: 10.1016/j.chroma.2004.04.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The off-line combination of isotachophoresis (ITP) and high-performance liquid chromatography (HPLC) to improve sample pretreatment and determination of phenolic compounds in wine was investigated. The ITP system provided an enhanced sample load capacity and served as a sample clean-up technique, HPLC performed a final separation of the analytes presented in samples. The phenolic components were separated by Discovery RP Amid C16 chromatography column using water-methanol-acetonitrile-orthophosphoric acid gradient. The identification of phenolic compounds was made by comparison of the retention data obtained for the standard mixture, pretreated sample and the sample spiked standard additions. Satisfactory recoveries for all components analysed were observed between 86.1 and 109.2%.
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Affiliation(s)
- Radek Sladkovský
- Department of Analytical Chemistry, Faculty of Pharmacy, Charles University, Heyrovského 1203, 50005 Hradec Králové, Czech Republic
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34
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Simultaneous Derivative Spectrophotometric Determination of Levodopa and Carbidopa in Pharmaceutical Preparations. B KOREAN CHEM SOC 2004. [DOI: 10.5012/bkcs.2004.25.12.1764] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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35
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Rehová L, Skeríková V, Jandera P. Optimisation of gradient HPLC analysis of phenolic compounds and flavonoids in beer using a CoulArray detector. J Sep Sci 2004; 27:1345-59. [PMID: 15587285 DOI: 10.1002/jssc.200401916] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A method was developed for simultaneous analysis of natural antioxidants in beer using multichannel electrochemical detection with a CoulArray detector, which enables selective and sensitive antioxidant detection in gradient HPLC and facilitates the identification of analytes based on the ratios of signals recorded at different potentials applied to the detection cells arranged in series. The separation conditions were optimised for 27 phenolic compounds including derivatives of benzoic and cinnamic acids, flavones, and a few related glycosides identified in beer samples. Separation selectivities of 11 columns with different stationary phase chemistries were compared, and the pH and gradient programs were optimised for the individual columns to provide best resolution and high number of resolved peaks, using the window-diagram approach. The effects of pH on the sensitivity of electrochemical coulometric detection were considered in the optimisation approach. The optimised conditions were applied to the analysis of real beer samples.
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Affiliation(s)
- Lucie Rehová
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Department of Analytical Chemistry, CZ-162 06 Prague 6, Czech Republic
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36
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Talebpour Z, Haghgoo S, Shamsipur M. 1H nuclear magnetic resonance spectroscopy analysis for simultaneous determination of levodopa, carbidopa and methyldopa in human serum and pharmaceutical formulations. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2003.10.081] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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37
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Abstract
There is considerable interest in the bioavailability of flavan-3-ols such as tea catechins and their bioactivity in vivo. Although flavanols such as catechin and epicatechin have long been characterized as powerful antioxidants in vitro, evidence suggests that these compounds undergo significant metabolism and conjugation during absorption in the small intestine and in the colon. In the small intestine these modifications lead primarily to the formation of glucuronide conjugates that are more polar than the parent flavanol and are marked for renal excretion. Other phase II processes lead to the production of O-methylated forms that have reduced antioxidant potential via the methylation of the B-ring catechol. Significant modification of flavanols also occurs in the colon where the resident microflora degrade them to smaller phenolic acids, some of which may be absorbed. Cell, animal and human studies have confirmed such metabolism by the detection of flavanol metabolites in the circulation and tissues. This review will highlight the major sites of flavanol metabolism in the gastrointestinal tract and the processes that give rise to potential bioactive forms of flavan-3-ols in vivo.
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Affiliation(s)
- Jeremy P E Spencer
- olfson Centre for Age-Related Disease, GKT School of Biomedical Science, King's College London, London, SE1 9RT, UK.
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38
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Sato M, Tanaka H, Fujiwara S, Hirata M, Yamaguchi R, Etoh H, Tokuda C. Antibacterial property of isoflavonoids isolated from Erythrina variegata against cariogenic oral bacteria. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2003; 10:427-433. [PMID: 12834009 DOI: 10.1078/0944-7113-00225] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The antibacterial property of 7 compounds, isolated from Erythrina variegata (Leguminosae) by repeated silica gel column chromatography, against cariogenic oral bacteria was investigated. Extensive spectroscopic study revealed that all were isoflavonoids. Among them, 3,9-dihydroxy-2,10-di(gamma,gamma-dimethylallyl)-6a,11a-dehydropterocarpan (erycristagallin) showed the highest antibacterial activity against mutans streptococci, other oral streptococci, Actinomyces and Lactobacillus species with a minimum inhibitory concentration (MIC) range of 1.56-6.25 microg/ml, followed by 3,6a-dihydroxy-9-methoxy-2,10-di(gamma,gamma-dimethylallyl)pterocarpan (erystagallinA) and 9-hydroxy-3-methoxy-2-gamma,gamma-dimethylallylpterocarpan (orientanol B) (MIC range: 3.13-12.5 microg/ml). The antibacterial effect of erycristagallin to mutans streptococci was based on a bactericidal action. Erycristagallin (6.25 microg/ml: MIC) completely inhibited incorporation of radio-labelled thymidine into Streptococcus mutans cells. Incorporation of radio-labelled glucose into bacterial cells was also strongly inhibited at MIC, and 1/2 MIC of the compound reduced the incorporation approximately by half. The findings indicate that erycristagallin has a potential as potent phytochemical agent for prevention of dental caries by inhibiting the growth of cariogenic bacteria and by interfering with incorporation of glucose responsible for production of organic acids.
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Affiliation(s)
- M Sato
- Department of Oral Pathology, Asahi University School of Dentistry, Gifu, Japan.
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39
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Analytical performance of commercially available and unavailable phenolic compounds using real samples by high-performance liquid chromatography–diode-array detection. Anal Chim Acta 2002. [DOI: 10.1016/s0003-2670(02)00140-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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40
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Mochizuki M, Yamazaki SI, Kano K, Ikeda T. Kinetic analysis and mechanistic aspects of autoxidation of catechins. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1569:35-44. [PMID: 11853955 DOI: 10.1016/s0304-4165(01)00230-6] [Citation(s) in RCA: 237] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A peroxidase-based bioelectrochemical sensor of hydrogen peroxide (H(2)O(2)) and a Clark-type oxygen electrode were applied to continuous monitoring and kinetic analysis of the autoxidation of catechins. Four major catechins in green tea, (-)-epicatechin, (-)-epicatechin gallate, (-)-epigallocatechin, and (-)-epigallocatechin gallate, were used as model compounds. It was found that dioxygen (O(2)) is quantitatively reduced to H(2)O(2). The initial rate of autoxidation is suppressed by superoxide dismutase and H(+), but is independent of buffer capacity. Based on these results, a mechanism of autoxidation is proposed; the initial step is the one-electron oxidation of the B ring of catechins by O(2) to generate a superoxide anion (O(2)(*-)) and a semiquinone radical, as supported in part by electron spin resonance measurements. O(2)(*-) works as a stronger one-electron oxidant than O(2) against catechins and is reduced to H(2)O(2). The semiquinone radical is more susceptible to oxidation with O(2) than fully reduced catechins. The autoxidation rate increases with pH. This behavior can be interpreted in terms of the increase in the stability of O(2)(*-) and the semiquinone radical with increasing pH, rather than the acid dissociation of phenolic groups. Cupric ion enhances autoxidation; most probably it functions as a catalyst of the initial oxidation step of catechins. The product cuprous ion can trigger a Fenton reaction to generate hydroxyl radical. On the other hand, borate ion suppresses autoxidation drastically, due to the strong complex formation with catechins. The biological significance of autoxidation and its effectors are also discussed.
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Affiliation(s)
- Manabu Mochizuki
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
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41
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Determination of green-tea catechins in cosmetic formulations and in in-vitro skin extracts by high-performance liquid chromatography coupled with electrospray ionization mass spectrometry. Chromatographia 2002. [DOI: 10.1007/bf02492313] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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42
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Spencer JP, Schroeter H, Rechner AR, Rice-Evans C. Bioavailability of flavan-3-ols and procyanidins: gastrointestinal tract influences and their relevance to bioactive forms in vivo. Antioxid Redox Signal 2001; 3:1023-39. [PMID: 11813978 DOI: 10.1089/152308601317203558] [Citation(s) in RCA: 125] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
There is considerable interest in the bioavailability of flavan-3-ols such as tea catechins and cocoa-derived procyanidin components of the diet and their bioactivity in vivo. Their hydrogen-donating abilities and their propensity for nitration make these compounds powerful scavengers of reactive oxygen and nitrogen species. In addition, recent evidence has suggested that these compounds may interact with redox-sensitive cell signaling pathways. However, their bioactivity in vivo will be dependent on the absorption and metabolism of these compounds after ingestion and the reducing properties of resulting metabolites. Many cell, animal, and human studies have shown that flavanol monomers, such as epicatechin, are extensively metabolised to O-methylated forms and/or conjugated to glucuronides and sulphates during absorption into the circulation. The cleavage of higher procyanidin oligomers to mixtures of monomer and dimer in the stomach may act to enhance the potential for their absorption in the small intestine as higher oligomers have very limited absorption. Studies suggest that the major bioactive forms of flavanol monomers and procyanidins in vivo are likely to be metabolites and/or conjugates of epicatechin. One such metabolite, 3'-O-methylepicatechin, has been shown to exert protective effects against oxidative stress-induced cell death. Future studies will continue to concentrate on the exact mechanism of action of the bioactive forms of flavan-3-ols in vivo.
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Affiliation(s)
- J P Spencer
- Antioxidant Research Group, Wolfson Centre for Age-Related Diseases, GKT School of Biomedical Sciences, King's College London, UK
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43
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Long H, Zhu Y, Cregor M, Tian F, Coury L, Kissinger CB, Kissinger PT. Liquid chromatography with multi-channel electrochemical detection for the determination of epigallocatechin gallate in rat plasma utilizing an automated blood sampling device. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 763:47-51. [PMID: 11710582 DOI: 10.1016/s0378-4347(01)00365-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A liquid chromatography method with multi-channel electrochemical detection was developed for the determination of epigallocatechin gallate (EGCG) in rat plasma. After administration of EGCG, blood samples were periodically collected by Culex (an automated blood sampling robot). EGCG was extracted from 50 microl of diluted blood (blood and saline at a ratio of 1:1) with ethyl acetate. Chromatographic separation was achieved within 10 min using a C8 (150x4.6 mm) 5 microm column with a mobile phase containing 20 mM sodium monochloroacetate, pH 2.8 and 12% acetonitrile at a flow-rate of 1.2 ml/min. A four-channel detector with glassy carbon electrodes was used with applied potentials of +700, 600, 500, 400 mV vs. Ag/AgCl. The limit of detection was 2 ng/ml at a signal-to-noise ratio of 3:1 and the limit of quantitation was 5 ng/ml. The calibration curve was linear over the range of 5-800 ng/ml. The intra- and inter-assay precisions were in the range of 1.3-4.5% and 2.2-4.4%, respectively. Using this method it was possible to determine plasma concentration following a single dose of EGCG to rats with good accuracy and precision. Thus the pharmacokinetic properties of EGCG in rats can be examined for intravenous, intraperitoneal and oral dosing.
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Affiliation(s)
- H Long
- Bioanalytical Systems, Inc., West Lafayette, IN 47906, USA
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44
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Yanes EG, Gratz SR, Baldwin MJ, Robison SE, Stalcup AM. Capillary electrophoretic application of 1-alkyl-3-methylimidazolium-based ionic liquids. Anal Chem 2001; 73:3838-44. [PMID: 11534705 DOI: 10.1021/ac010263r] [Citation(s) in RCA: 275] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ionic substances with melting points at or close to room temperature are referred to as ionic liquids. Interest in ionic liquids for their potential in different chemical processes is increasing, because they are environmentally benign and are good solvents for a wide range of both organic and inorganic materials. In this study, a capillary electrophoretic method for resolving phenolic compounds found in grape seed extracts is reported. The method, in which 1-alkyl-3-methylimidazolium-based ionic liquids are used as the running electrolytes, is simple and reproducible. The separation mechanism seems to involve association between the imidazolium cations and the polyphenols. The role of the alkyl substituents on the imidazolium cations was investigated and will be discussed.
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Affiliation(s)
- E G Yanes
- Department of Chemistry, University of Cincinnati, Ohio 45221-0172, USA
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45
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Nagaraja P, Vasantha RA, Sunitha KR. A new sensitive and selective spectrophotometric method for the determination of catechol derivatives and its pharmaceutical preparations. J Pharm Biomed Anal 2001; 25:417-24. [PMID: 11377021 DOI: 10.1016/s0731-7085(00)00504-5] [Citation(s) in RCA: 142] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A sensitive and simple spectrophotometric method for the estimation of certain catechol derivatives like pyrocatechol (PCL), dopamine hydrochloride (DPH), levodopa (LDP), methyl dopa (MDP) and adrenaline (ADH) in either pure form or in its pharmaceutical formulation is described. The method is based on the interaction of diazotised p-nitro aniline (DPNA) with catechol derivatives in presence of molybdate ions in acidic medium. Absorbance of the resulting red complex is measured at 500-510 nm, respectively, and is stable for 2-10 h. The method is highly reproducible and specific for these selected catechol derivatives. The common excipients used as additives in pharmaceuticals and phenol, hydroquinone, resorcinol, pyrogallol and phloroglucinol do not interfere in the proposed method. Analytical data for determination of the pure compound is presented together with the application of the proposed method to the analysis of some pharmaceutical formulations. The results compare favourably with those of official and reported methods.
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Affiliation(s)
- P Nagaraja
- Department of Studies in Chemistry, Mysore University, Manasagangothri, 570 006, Mysore, India.
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46
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Abstract
Green tea catechins consisting of catechin stereoisomers and their derivatives have been suggested to show biological activities through the interactions with cellular membranes. Their effects on membrane fluidity were comparatively studied by measuring fluorescence polarization of liposomal membranes prepared with phospholipids and cholesterol. All catechin stereoisomers reduced membrane fluidity by acting on the hydrophilic and hydrophobic regions of membrane bilayers at 20-500 microM. Both epicatechins in a cis form were more effective for reducing membrane fluidity than both catechins in a trans form. (-)-Epicatechin, (+)-epicatechin, (-)-catechin and (+)-catechin reduced membrane fluidity in increasing order of intensity. Such difference between optical isomers was increased by chiral cholesterol added to membrane lipids. In reversed-phase chromatographic evaluation, (-)-epicatechin and (+)-epicatechin were more hydrophobic than (-)-catechin and (+)-catechin, although hydrophobicity was not distinguishable between optical isomers. Stereospecificity in the membrane effects of catechin stereoisomers may be induced by the different hydrophobicity of geometrical isomers and the chirality of membrane lipid components. At lower concentrations (5-100 microM), (-)-epigallocatechin gallate and (-)-epicatechin gallate reduced membrane fluidity more significantly than (-)-epicatechin, suggesting that the intensive membrane effect contributes to the potent medicinal utility of (-)-epigallocatechin gallate.
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Affiliation(s)
- H Tsuchiya
- Department of Dental Pharmacology, Asahi University School of Dentistry, 1851 Hozumi, Hozumi-cho, Motosu-gun, 501-0296, Gifu, Japan.
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47
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Escarpa A, González MC. Optimization strategy and validation of one chromatographic method as approach to determine the phenolic compounds from different sources. J Chromatogr A 2000; 897:161-70. [PMID: 11128199 DOI: 10.1016/s0021-9673(00)00817-7] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We have designed a novel working strategy to optimize a unique chromatographic method consisting of diode array detection for the analysis of the most representative phenolic compounds from different food sources. The simultaneous inclusion of standard phenolic compounds, phenolic compounds isolated from food sources and representative real extracts as an ultimate test in analysis has allowed to establish, for the first time, a unique liquid gradient to serve as an excellent medium for the investigation of phenolics in samples from different food sources. Under the optimized conditions, 21 commercially available phenolic compounds and 25 commercially unavailable phenolic structures were analyzed in less than 30 min. The chromatographic method was designed as an alternative for the provisional identification of these compounds before their full characterization. The optimized chromatographic method was carefully validated for precision and accuracy. A high reproducibility in the retention time (<2%), peak area and calibration slope (<5%) as well as recoveries higher than 95% were obtained in all cases. Consequently, the currently described method was successfully employed to study the phenolic compounds in the most representative food samples.
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Affiliation(s)
- A Escarpa
- Departamento de Química Analítica, Facultad de Ciencias, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain.
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48
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Abstract
An overview of analytical methods for the measurement of biologically important tea catechins is presented. Liquid chromatography and capillary electrophoresis are the most cited techniques for catechin separation, identification and quantitation. Liquid chromatography with ultraviolet detection is frequently used; however, mass spectrometry, electrochemical, fluorescence and chemiluminescence detection are also utilized in cases where more sensitive or selective detection is needed. Two modes of capillary electrophoresis, capillary zone electrophoresis and micellar electrokinetic capillary chromatography, have been employed for the determination of catechins. Both modes of capillary electrophoresis are based on ultraviolet detection. Additional analytical techniques, such as gas chromatography, thin-layer chromatography, paper chromatography, spectrophotometry, biosensing, chemiluminescence and nuclear magnetic resonance spectroscopy have also been utilized for the determination of catechins and are reviewed herein.
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Affiliation(s)
- J J Dalluge
- National Institute of Standards and Technology, Analytical Chemistry Division, Gaithersburg, MD 20899-0001, USA.
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Tsuchiya H, Iinuma M. Reduction of membrane fluidity by antibacterial sophoraflavanone G isolated from Sophora exigua. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2000; 7:161-165. [PMID: 10839220 DOI: 10.1016/s0944-7113(00)80089-6] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Sophoraflavanone G (5,7,2',4'-tetrahydroxy-8-lavandulylflavanone) has been referred as a phytochemical with the intensive antibacterial activity. To elucidate the pharmacological mechanism underlying an antibacterial action, sophoraflavanone G was isolated from Sophora exigua, thereafter its effect on membrane fluidity was studied using model membranes and compared with less active naringenin lacking 8-lavandulyl and 2'-hydroxyl groups. Highly purified sophoraflavanone G of 0.05-5 microg/ml, corresponding to the minimum growth inhibitory concentrations against various bacteria, significantly increased fluorescence polarization of the liposomes prepared from 1,2-dipalmitoyl-L-alpha-phosphatidylcholine and 1-palmitoyl-2-oleoyl-L-alpha-phosphatidylcholine. Such increases were found in both liposomes measured with two fluorescent probes to indicate an alteration of membrane fluidity in hydrophilic and hydrophobic regions, suggesting that sophoraflavanone G reduces the fluidity of outer and inner layers of membranes. Although naringenin also showed the membrane effect, it needed concentrations over 2.5 microg/ml to induce a significant reduction of membrane fluidity. Sophoraflavanone G is considered to exert an antibacterial effect by reducing the fluidity of cellular membranes.
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Affiliation(s)
- H Tsuchiya
- Department of Dental Pharmacology, Asahi University School of Dentistry, Gifu, Japan.
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Lee MJ, Prabhu S, Meng X, Li C, Yang CS. An improved method for the determination of green and black tea polyphenols in biomatrices by high-performance liquid chromatography with coulometric array detection. Anal Biochem 2000; 279:164-9. [PMID: 10706785 DOI: 10.1006/abio.2000.4487] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Tea polyphenols are strong antioxidants and are believed to have beneficial health effects. However, the blood and tissue levels of these compounds are not well characterized because of a lack of suitable analytical methods for the biological resolution of these compounds. Previously, we developed methods for the analysis of three green tea catechins. Now we report an improved method for the measurement of the levels of the different catechins and theaflavins in biological fluids and tissues. The method includes digestion of the plasma, urine, or tissue samples with beta-d-glucuronidase and sulfatase, followed by extraction with ethyl acetate and subsequent separation by reversed-phase high-performance liquid chromatography (HPLC). The polyphenols are identified on the basis of their retention times, spectral analysis, and electrochemical behavior across an array of electrodes. In a single HPLC run, it is possible to determine the major catechins and theaflavins as well as some of the catechin metabolites. The detection limits for catechins and theaflavins are from 5 to 10 ng/ml of saliva, plasma, or urine.
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Affiliation(s)
- M J Lee
- Laboratory for Cancer Research, Rutgers, The State University of New Jersey, Piscataway, New Jersey, 08854, USA
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