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Karadag A, Ozkan K, Sagdic O. Development of microencapsulated grape juice powders using black 'Isabel' grape peel pectin and application in jelly formulation with enhanced in vitro bioaccessibility of anthocyanins. J Food Sci 2024; 89:2067-2083. [PMID: 38411308 DOI: 10.1111/1750-3841.16999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 01/30/2024] [Accepted: 02/08/2024] [Indexed: 02/28/2024]
Abstract
In this study, pigmented pectin (grape pectin, GP) was extracted from the peels of black Isabel grapes. This highly methoxylated GP was composed mainly of galacturonic acid, arabinose, and other neutral monosaccharides. Its red color was ascribed to the anthocyanin content, and the main contribution was from malvidin-3-O-glucoside. To improve the yield and color properties of spray-dried Isabel grape juice powders, maltodextrin (MD) was substituted with this colored GP. When 25% of MD was substituted with GP, the powder yield increased from 46.0% to 60.4%, but it decreased to 21% when the substitution was 40%. GP inclusion increased the encapsulation efficiency of total anthocyanin in powders from 55.70% to 88.66%. When this spray-dried grape juice powder containing GP was utilized in a jelly recipe (4%-10%), a higher level of inclusion yielded stronger and more brittle jellies. When the jellies containing varying amounts of GP were subjected to in vitro digestion, the formulation with a higher amount of GP yielded a higher recovery of anthocyanins. In addition to being utilized as a carrier agent for spray-drying applications, this pigmented GP can also be tailored for a variety of applications, such as the development of pH-sensitive edible films and functional beverage formulations.
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Affiliation(s)
- Ayse Karadag
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Kubra Ozkan
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Osman Sagdic
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
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Mergen Duymaz G, Duz G, Ozkan K, Karadag A, Yilmaz O, Karakus A, Cengiz O, Akyildiz IE, Basdogan G, Damarlı E, Sagdic O. The evaluation of L-arginine solution as a solvent for propolis extraction: The phenolic profile, antioxidant, antibacterial activity, and in vitro bioaccessibility. Food Sci Nutr 2024; 12:2724-2735. [PMID: 38628177 PMCID: PMC11016385 DOI: 10.1002/fsn3.3953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 12/27/2023] [Accepted: 12/29/2023] [Indexed: 04/19/2024] Open
Abstract
Ethanol has been widely used for the extraction of propolis. Due to its certain disadvantages, there has been an ongoing search to find alternative non-ethanolic extraction solvents. This study aimed to compare the phenolics, antioxidant, and antibacterial activity of propolis extracts prepared with 70% ethanol (EWE), propylene glycol (PGE), and L-arginine solution (BE). All extracts were subjected to an in vitro simulated digestion procedure, and the phenolic profile of non-digested and digested samples was determined by using LC-MS/MS. Additionally, the change in total phenolic (TPC), total flavonoid content (TFC), and antioxidant capacities were determined at each digestion phase. TPC and TFC of non-digested propolis extracts had similar values, although BE showed higher antioxidant capacity (p < .05). The amount of TPC reached or transformed at the intestinal stage was higher for BE and PG compared to EWE. BE also provided the highest antioxidant capacity assay in digested samples. The most common phenolics were pinocembrin, pinobanskin, galangin, and CAPE in non-digested extracts. However, their concentration was drastically reduced by digestion, and their recovery (R%) ranged from 0% to 9.38% of the initial amount detected in the non-digested extracts. Chrysin was the most bioaccessible flavonoid in all extracts. Among phenolic acids, the highest R% was determined for trans-cinnamic acid (22.14%) from BE. All extracts showed in vitro inhibitory activity against Escherichia coli and Staphylococcus aureus. This study suggests that an L-arginine solution could be used as an alternative solvent to ethanol and propylene glycol for propolis extraction.
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Affiliation(s)
- Gizem Mergen Duymaz
- Food Engineering DepartmentYildiz Technical UniversityIstanbulTurkey
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
| | - Gamze Duz
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
- Department of ChemistryIstanbul Technical UniversityIstanbulTurkey
| | - Kubra Ozkan
- Food Engineering DepartmentYildiz Technical UniversityIstanbulTurkey
| | - Ayse Karadag
- Food Engineering DepartmentYildiz Technical UniversityIstanbulTurkey
| | - Ozlem Yilmaz
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
| | - Ayca Karakus
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
| | - Ozlem Cengiz
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
| | - Ismail Emir Akyildiz
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
- Chemistry DepartmentMarmara UniversityIstanbulTurkey
| | - Gunay Basdogan
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
| | - Emel Damarlı
- Altiparmak Gıda San. ve Tic. A.S. Balparmak R&D CenterIstanbulTurkey
| | - Osman Sagdic
- Food Engineering DepartmentYildiz Technical UniversityIstanbulTurkey
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Yener E, Saroglu O, Sagdic O, Karadag A. The Effects of Different Drying Methods on the In Vitro Bioaccessibility of Phenolics, Antioxidant Capacity, and Morphology of European Plums ( Prunes domestica L.). ACS Omega 2024; 9:12711-12724. [PMID: 38524419 PMCID: PMC10955707 DOI: 10.1021/acsomega.3c08383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 02/15/2024] [Accepted: 02/19/2024] [Indexed: 03/26/2024]
Abstract
Four different drying methods, hot-air-drying (HAD), vacuum-drying (VD), ultrasound-assisted vacuum-drying (US-VD), and freeze-drying (FD), were used to obtain dried plums (Prunes domesticaL.). These prunes were evaluated for their physical properties (such as color, rehydration ratio, and microstructural properties), phenolic compounds, and antioxidant activities before and after being subjected to in vitro digestion. TPC (total phenolic content) of plums ranged from 196.84 to 919.58 mg of GAE (gallic acid equivalent)/100 g of dw, and neochlorogenic acid was the most abundant phenolic compound. FD prunes had the highest levels of phenolics, whereas US-VD caused the most significant loss. During in vitro digestion, the phenolics were present at higher levels at the gastric medium but failed to maintain their stability at the small intestinal stage. Among the samples, FD along with HAD prunes exhibited a higher bioaccessibility index for most of the phenolic compounds. The ratios of TPC, TFC (total flavonoid content), and individual phenolics determined in the digested residues to the initial values of the undigested samples ranged from 0.23 to 31.03%. It could be concluded that the majority of the phenolics were extracted during digestion. Our findings showed that the different drying methods would alter the microstructure, which would affect the extractability and release of phenolics in the simulated digestion model.
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Affiliation(s)
- Elif Yener
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, 34210 Istanbul, Turkey
- Food
Institute, TUBITAK Marmara Research Center, Gebze 41470, Turkey
| | - Oznur Saroglu
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, 34210 Istanbul, Turkey
| | - Osman Sagdic
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, 34210 Istanbul, Turkey
| | - Ayse Karadag
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, 34210 Istanbul, Turkey
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Saroglu O, Karadag A. Propolis-loaded liposomes: characterization and evaluation of the in vitro bioaccessibility of phenolic compounds. ADMET DMPK 2024; 12:209-224. [PMID: 38560718 PMCID: PMC10974815 DOI: 10.5599/admet.2204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/29/2024] [Indexed: 04/04/2024] Open
Abstract
Background and purpose Propolis has low water solubility, poor stability, and limited bioaccessibility of phenolic constituents when subjected to in vitro digestion. To overcome these drawbacks, the liposomal encapsulation method can be employed. Experimental approach Soybean phosphatidylcholine lecithin mixed with Tween 80 (T80) and ammonium phosphatides (AMP) was used to produce propolis extract (PE)-loaded liposomes. The mean particle size, zeta potential, encapsulation efficiency values, and transmission electron microscopy analysis were used to characterize liposomes. Individual phenolics were determined for digested and nondigested propolis-loaded liposomes and propolis extract. Key results Tween 80 incorporation reduced the size of unloaded liposomes, whereas AMP inclusion yielded larger liposomes. In both formulations, PE loading significantly increased the size and reduced the zeta potential values and homogeneity of the size distribution. In free PE, the most bioaccessible polyphenols were phenolic acids (3.20 to 5.63 %), and flavonoids such as caffeic acid phenethyl ester, galangin, pinobanksin, and pinocembrin (0.03 to 2.12 %) were the least bioaccessible. Both liposomal propolis provided significantly higher bioaccessibility of phenolic compounds. The liposomes with T80 and AMP in their compositions recovered 52.43 and 185.90 % of the total amount of phenolic compounds in the nondigested samples, respectively. The liposomes containing AMP not only exhibited high solubility for PE but also provided protection to the phenolic compounds during in vitro digestion. Conclusion Liposomal encapsulation could be a promising approach to improving the solubility and stability of PE in digestive fluids, making it suitable for the delivery of propolis in oral formulations.
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Affiliation(s)
| | - Ayse Karadag
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
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Ozcan BE, Saroglu O, Karakas CY, Karadag A. Encapsulation of purple basil leaf extract by electrospraying in double emulsion (W/O/W) filled alginate-carrageenan beads to improve the bioaccessibility of anthocyanins. Int J Biol Macromol 2023; 250:126207. [PMID: 37567525 DOI: 10.1016/j.ijbiomac.2023.126207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 06/26/2023] [Accepted: 08/05/2023] [Indexed: 08/13/2023]
Abstract
The purple basil leaf extract (PBLE) was encapsulated in double emulsion (W1/O/W2)-loaded beads (emulgel) by electrospraying. The influence of κ-carrageenan (κ-CG) and cross-linking agents (Ca2+/K+) on the properties of alginate (SA) beads were assessed. In emulgel beads, κ-CG inclusion resulted in larger sizes and more distorted shapes, wrinkles on the surface, and lower gel strength. The encapsulation efficiency of anthocyanins (ACNs) in emulgel beads ranged from 70.73 to 87.89 %, whereas it ranged from 13.50 to 20.67 % in emulsion-free (hydrogel) beads. Fourier transforms infrared (FTIR) revealed the crosslinking of SA and κ-CG with Ca2+ and K+, thermogravimetric analysis (TGA), derivative thermogravimetric (DTG), and differential scanning calorimetry (DSC) thermograms showed emulgel beads yielded higher thermal stability. The emulgel beads elevated the in vitro bioaccessibility of ACNs under simulated digestion. At the gastric phase, 86 % of ACNs in PBLE, and 46 % of loaded ACNs in hydrogel beads were released, whereas no release was occurred in emulgel beads. At the intestinal phase, after 150 min of digestion, no ACNs were detected in PBLE and hydrogel beads, whereas all emulgel beads continued to release ACNs until 300 min. The incorporation of double emulsions in hydrogel beads can be utilized in the development of functional foods.
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Affiliation(s)
- Basak Ebru Ozcan
- Department of Food Engineering, Faculty of Engineering, Kirklareli University, Kırklareli 39000, Turkey; Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul 34210, Turkey
| | - Oznur Saroglu
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul 34210, Turkey
| | - Canan Yagmur Karakas
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul 34210, Turkey
| | - Ayse Karadag
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul 34210, Turkey.
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Karakaş CY, Yildirim RM, Karadag A. Encapsulation of Lactobacillus plantarum ELB90 by electrospraying in a double emulsion (W1/O/W2) loaded alginate beads to improve the gastrointestinal survival and thermal stability. J Sci Food Agric 2023; 103:3427-3436. [PMID: 36764922 DOI: 10.1002/jsfa.12494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 01/24/2023] [Accepted: 02/11/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND In the present study, the Lactobacillus plantarum ELB90 was encapsulated in double emulsion (W1/O/W2) loaded alginate beads (emulbeads) by electrospraying and compared with emulsion-free control beads. The viability of encapsulated and free cells was assessed by exposing them to thermal processing (65 °C for 30 min and 72 °C for 3 min) and simulated gastrointestinal conditions. The beads were characterized by optical, scanning electron, fluorescence, and confocal laser scanning microscopy, as well as Fourier transform infrared and gel strength analysis. RESULTS After the intestinal stage of digestion, the survival rate of free bacteria was 38% [3.70 log colony-forming units (CFU) g-1 ], only increased to 43% and 53% for bare and chitosan-coated control beads, and it elevated the survival rate to 75% and 84% (8.70 log CFU g-1 ) for bare and chitosan-coated emulbeads, respectively. The presence of inulin increased gastrointestinal viability only in uncoated emulbeads. The bacteria loaded in emulbeads retained greater viability (5.90-6.90 log CFU g-1 ) against thermal treatment, compared to control beads (2.07-4.10 log CFU g-1 ) and free bacteria (2.57-3.11 log CFU mL-1 ). Encapsulation of L. plantarum ELB90 only in emulsion-free beads may not be appropriate for providing thermal stability. Inulin addition and chitosan-coating of the beads increased the size, and emulbeads presented smoother surfaces compared to emulsion-free beads. CONCLUSION The contribution of a double emulsion into the gel matrix of electrosprayed alginate beads exhibited enhanced protection for probiotic bacteria that could be useful for the development of functional foods. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Canan Yağmur Karakaş
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Rusen Metin Yildirim
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Ayse Karadag
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
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Saroglu O, Tav B, Yildirim RM, Karadag A. Microencapsulation of olive mill wastewater in Saccharomyces cerevisiae cells by spray drying and in vitro bioaccessibility of phenolic compounds. Food Funct 2023; 14:3746-3759. [PMID: 36988278 DOI: 10.1039/d2fo03872b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
Olive-mill wastewater (OMW), a by-product with high biological value and rich in phenolic compounds, is converted into spray-dried powders by using baker's yeast cells (YCs) as the carrier material. The encapsulation of OMW into YCs was also confirmed by Fourier transform infrared spectroscopy (FT-IR) analysis. The encapsulation yield (%) of powders for OMW phenolics was determined as 5.42 ± 0.33 and 4.02 ± 0.01% in YC microparticles non-treated and treated with high-pressure homogenization (HPH), respectively. The distorted structure of YCs, observed in scanning electron microscopy images, reduced the retention of OMW phenolics by YCs. HPH application made water removal easier, and the moisture content of YC-OMW powders was reduced from 5.13 to 3.72%. Compared to free OMW, the bioaccessibility indices (BI%) of individual phenolics were increased through yeast encapsulation, at the end of the intestinal stage, hydroxytyrosol and oleuropein could still be detected in encapsulated samples (BI% of 14-25 and 124-189%), but not in free OMW. Thus, YCs could be considered suitable encapsulating agents and show promising characteristics for technological application.
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Affiliation(s)
- Oznur Saroglu
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
| | - Berkay Tav
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
- Döhler Food and Beverage Ingredients R&D Center, Karaman 70100, Turkey
| | - Rusen Metin Yildirim
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
| | - Ayse Karadag
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul 34210, Turkey.
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Ozkan G, Günal-Köroğlu D, Karadag A, Capanoglu E, Cardoso SM, Al-Omari B, Calina D, Sharifi-Rad J, Cho WC. A mechanistic updated overview on lycopene as potential anticancer agent. Biomed Pharmacother 2023; 161:114428. [PMID: 36841029 DOI: 10.1016/j.biopha.2023.114428] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/15/2023] [Accepted: 02/20/2023] [Indexed: 02/27/2023] Open
Abstract
The potent relation between lycopene intake and reduced incidence of a variety of cancers has an increasing interest. This comprehensive review aims to highlight the in vivo and in vitro research evaluating the anticancer mechanisms of lycopene by underlining the experiment conditions. In addition to these, the general characterization of lycopene has been explained. A collection of relevant scientific pharmacological articles from the following databases PubMed/MedLine, Web of Science, Scopus, TRIP database, and Google Scholar on the mechanisms of anticancer molecular action and cellular effects of lycopene in various types of tumors was performed. The anticancer potential of lycopene has been described by various in vitro cells, animal studies, and some clinical trials. It has been revealed that the anticancer potential of lycopene is mainly due to its powerful singlet-oxygen quencher characteristics, simulation of detoxifying/antioxidant enzymes production, initiation of apoptosis, inhibition of cell proliferation and cell cycle progression as well as modulations of gap junctional communication, the growth factors, and signal transduction pathways. It has been highlighted that the anticancer properties of lycopene are primarily linked to factors including; dose, presence of drug delivery systems, type of cancer, tumor size, and treatment time.
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Affiliation(s)
- Gulay Ozkan
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey
| | - Deniz Günal-Köroğlu
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey
| | - Ayse Karadag
- Faculty of Chemical and Metallurgical Engineering, Department of Food Engineering, Yildiz Technical University, Davutpasa Campus, Istanbul, Turkey
| | - Esra Capanoglu
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey.
| | - Susana M Cardoso
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Basem Al-Omari
- Department of Epidemiology and Population Health, College of Medicine and Health Sciences, Khalifa University, Abu Dhabi, United Arab Emirates.
| | - Daniela Calina
- Department of Clinical Pharmacy, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania.
| | | | - William C Cho
- Department of Clinical Oncology, Queen Elizabeth Hospital, Kowloon, Hong Kong.
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Ozturk A, Agbektas T, Tas A, Gul MA, Karadag A, Silig Y. The relationship between serum prolidase activity and histone H3 protein levels and fibromyalgia. Eur Rev Med Pharmacol Sci 2022; 26:9098-9106. [PMID: 36591822 DOI: 10.26355/eurrev_202212_30659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
OBJECTIVE Fibromyalgia (FM) is a clinical syndrome characterized by prominent physical and psychological impairment and widespread pain on both sides of the body, above and below the waist, and along the axial skeleton. It often causes sleep difficulties, memory impairment, mood changes, irritable bowel syndrome, and fatigue. Our study aimed to investigate the relationship between FM and prolidase (peptidase D) and histone H3 protein levels by comparing a patient group with a healthy control group. PATIENTS AND METHODS In total, 176 people were examined in our study, 88 of whom were healthy and 88 of whom had FM. Serum level was measured by ELISA. Then the results were analyzed using SPSS. All p < 0.05 were considered statistically significant. RESULTS A significant increase in the levels of prolidase was observed in the patient group compared with the control group (6.28-4.68, p <0.001). Histone H3 protein values were not significantly different between the patient and control groups (p=0.184). The ROC analysis indicated that prolidase was statistically significant in disease prediction (p<0.001, AUC: 0.795 (0.697-0.893), while histone H3 protein was statistically insignificant in predicting disease. CONCLUSIONS The results of the study show that prolidase activity may play a role in diagnosing FM. In addition, since no study like ours has been performed before, it can bring a new perspective to the literature.
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Affiliation(s)
- A Ozturk
- Clinical Biochemistry, Health Sciences University, Etlik City Hospital, Ankara, Turkey.
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Saroglu O, Karadag A, Cakmak ZHT, Karasu S. The formulation and microstructural, rheological, and textural characterization of salep-xanthan gum-based liposomal gels. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04546-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Karadag A, Kayacan Cakmakoglu S, Metin Yildirim R, Karasu S, Avci E, Ozer H, Sagdic O. Enrichment of lecithin with phenolics from olive mill wastewater by cloud point extraction and its application in vegan salad dressing. J FOOD PROCESS PRES 2022. [DOI: 10.1111/jfpp.16645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ayse Karadag
- Department of Food Engineering Yildiz Technical University Istanbul Turkey
| | | | | | - Salih Karasu
- Department of Food Engineering Yildiz Technical University Istanbul Turkey
| | - Esra Avci
- Department of Food Engineering Yildiz Technical University Istanbul Turkey
| | - Hayrettin Ozer
- Food Institute TUBITAK Marmara Research Center Gebze Turkey
| | - Osman Sagdic
- Department of Food Engineering Yildiz Technical University Istanbul Turkey
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Ozkan K, Karadag A, Sagdic O. The effects of drying and fermentation on the bioaccessibility of phenolics and antioxidant capacity of Thymus vulgaris leaves. AAlim 2022. [DOI: 10.1556/066.2021.00140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
Fresh thyme leaves (Thymus vulgaris L.) were dried at 45 °C for 5 h and naturally fermented at 20 °C in a brine solution containing salt and vinegar for 18 days. The ethanolic extracts of fresh (FT), dried (DT), and fermented-pickled (PT) thyme leaves were assessed in terms of total phenolic content (TPC), total flavonoid content (TFC), antioxidant capacity values and subjected to in vitro gastrointestinal digestion. TPC, TFC, and antioxidant capacity values of fermented thyme leaves were found significantly higher than of dried and fresh samples. The bioaccessibility index (BI) value for TPC and TFC was highest for PT and lowest for DT, indicating that both processes had different effects on the structure of phenolic compounds present in the thyme leaves. Similarly both Recovery and BI values of DPPH antioxidant capacity were highest for PT, but lowest for fresh samples. When CUPRAC assay was applied, the recovery % for FT and PT was similar, and the BI was higher for FT. Results showed that compared to the results of fresh thyme leaves, drying and pickling had a considerable effect on the initial phenolic compounds extracted and their fate during in vitro digestion.
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Affiliation(s)
- K. Ozkan
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, 34210, Istanbul, Turkey
| | - A. Karadag
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, 34210, Istanbul, Turkey
| | - O. Sagdic
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, 34210, Istanbul, Turkey
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Ozkan K, Karadag A, Sagdic O. The effects of different drying methods on the in vitro bioaccessibility of phenolics, antioxidant capacity, minerals and morphology of black ‘Isabel’ grape. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bekiroglu H, Bozkurt F, Karadag A, Ahhmed AM, Sagdic O. The effects of different protease treatments on the techno-functional, structural, and bioactive properties of bovine casein. Prep Biochem Biotechnol 2022; 52:1097-1108. [PMID: 35171080 DOI: 10.1080/10826068.2022.2033988] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
In this study, bovine sodium caseinate (NaCas) was hydrolyzed with four proteases, alcalase, savinase, subtilisin A, and flavourzyme. In addition to the structural changes occurred through the enzymatic hydrolysis, the solubility, oil binding capacity, zeta potential, emulsification properties, and in vitro antioxidant capacity, anti-carcinogenic and antidiabetic properties of hydrolysates were determined. FTIR combined with hierarchical cluster analysis (HCA) made in Amide I region enable to classification of the samples based on the changes of the secondary structure depending on the enzyme type and degree of fragmentation. Technological properties of NaCas were enhanced through the enzymatic hydrolysis, and those were more prominent in serine-type enzymes, regardless of the enzyme type, all hydrolysates showed high antioxidant capacities. All hydrolysates, specifically those produced by savinase and alcalase, reduced the viability of the carcinogenic Caco-2 cells in a dose-dependent manner and showed a very low level of cytotoxicity against healthy HEK-293 cells. The hydrolysis treatment made a significant contribution to the antidiabetic activity of NaCas. Particularly alcalase and savinase hydrolysates suppressed the activity of α- amylase and α- glucosidase. Therefore, the generated milk protein hydrolysates could be used in functional food developments for specific dietary purposes.
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Affiliation(s)
- Hatice Bekiroglu
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Fatih Bozkurt
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey.,Food Engineering Department, Mus Alparslan University, Mus, Turkey
| | - Ayse Karadag
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Abdulatef M Ahhmed
- Life Science Department, School of Basic Sciences, The Libyan Academy for Graduate Studies, Tripoli, Libya
| | - Osman Sagdic
- Food Engineering Department, Chemical, and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
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Karakas CY, Ordu HR, Bozkurt F, Karadag A. Electrosprayed chitosan-coated alginate-pectin beads as potential system for colon-targeted delivery of ellagic acid. J Sci Food Agric 2022; 102:965-975. [PMID: 34302363 DOI: 10.1002/jsfa.11430] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 06/11/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Ellagic acid (EA), a potent dietary antioxidant, has limited bioavailability owing to its rapid absorption in the stomach and small intestine, and EA is transformed to more bioavailable compounds - urolithins - in the colon. An encapsulation system that sustains the release of EA in the gastrointestinal system and delivers more EA into the colon could improve the oral bioavailability of EA. Electrosprayed EA-loaded alginate-pectin beads were produced and coated with low- (LC) and high-molecular-weight chitosan (HC). The EA release from uncoated and coated beads under simulated gastrointestinal conditions was evaluated. The samples were characterized by particle size, gel strength, scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) analysis. RESULTS The encapsulation efficiency (EE%) of EA ranged from 49.53% to 69.85% for uncoated beads, which was elevated up to 86.50% by coating, and LC coating provided higher EE%. Pectin addition to alginate and chitosan coating reduced the gel strength and changed the size depending on the molecular weight of chitosan. SEM images of pectin-added beads showed fewer cracks but more wrinkles, and chitosan coating presented more aggregated surfaces. The ionic interaction of alginate-pectin-chitosan and the entrapment of EA were confirmed by FTIR. In the gastric medium, EA release was very low from uncoated beads (15.2-19.8%), and totally restricted by chitosan coating. In the intestinal stage, EA release from LC-coated alginate-pectin beads was only 18%, and it was between 55% and 65% for uncoated or HC-coated counterparts. CONCLUSION The LC-coated alginate-pectin beads could be further explored as a potential system for colon-targeted delivery of EA. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Canan Y Karakas
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Hatice R Ordu
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
| | - Fatih Bozkurt
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
- Food Engineering Department, Engineering and Architecture Faculty, Muş Alparslan University, Muş, Turkey
| | - Ayse Karadag
- Food Engineering Department, Chemical and Metallurgical Engineering Faculty, Yildiz Technical University, Istanbul, Turkey
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Karadag A, Bozkurt F, Bekiroglu H, Sagdic O. Use of Principal Component Analysis and Cluster Analysis for Differentiation of Traditionally-Manufactured Vinegars Based on Phenolic and Volatile Profiles, and Antioxidant Activity. POL J FOOD NUTR SCI 2020. [DOI: 10.31883/pjfns/127399] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Duman D, Karadag A. Inulin added electrospun composite nanofibres by electrospinning for the encapsulation of probiotics: characterisation and assessment of viability during storage and simulated gastrointestinal digestion. Int J Food Sci Technol 2020. [DOI: 10.1111/ijfs.14744] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dilan Duman
- Food Engineering Department Yıldız Technical University 34210Esenler‐Istanbul Turkey
| | - Ayse Karadag
- Food Engineering Department Yıldız Technical University 34210Esenler‐Istanbul Turkey
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Akalın K, Ekiz AT, Karakaya F, Karadag A, Pelvan E, Doğan K, Alasalvar C, Aksu S. In vivo antidiabetic activities of green and black tea polysaccharides using streptozotocin- induced diabetic mice fed with a high-fat diet. ACTA ACUST UNITED AC 2019. [DOI: 10.31665/jfb.2019.8209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Type-2 diabetes (T2D) is the most common type of chronic disease in adults and accounts for around 90% of all cases of diabetes. Therefore, developing dietary supplements from natural sources, such as teas, is of great interest. Seven diet groups together with a parallel control group were used for three periods of 16 weeks in total [stabilization period (W-2-W0), model period (W0-W8), and treatment period (W8-W14)]. The primary aim of this study was to investigate the in vivo antidiabetic activities of green and black tea polysaccharides (GTPS and BTPS, respectively) using streptozotocin induced diabetic mice fed with either a high-fat diet (HFD) or normal diet (ND). Streptozotocin and HFD induced T2D in vivo model was developed during the model period (W0-W8) in C57BL/6J male mice. Both GTPS and BTPS groups were administrated for 6 weeks (daily 400 mg/kg body weight) by oral gavage throughout the treatment period (W8-W14). The results showed that BTPS group significantly (P < 0.05) decreased the fasting blood glucose level in diabetic mice even fed with a HFD and improved the insulin resistance. Similar effect was not obtained when GTPS group fed with a HFD. In addition, BTPS group fed with a HFD effectively suppressed the body weight gain despite high energy intake and was more successful than its GTPS counterpart group in healing pathologies of liver and affected plasma blood lipid levels due to streptozotocin and HFD-induced diabetes. The present work suggests that BTPS can be used as an antidiabetic dietary supplement without posing any potential health risk.
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Bagcivan G, Hoslar H, Karadag A. Taste changes and associated factors in patients receiving chemotherapy. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz276.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Karadag A, Pelvan E, Dogan K, Celik N, Ozturk D, Akalın K, Alasalvar C. Optimisation of green tea polysaccharides by ultrasound-assisted extraction and theirin vitroantidiabetic activities. Quality Assurance and Safety of Crops & Foods 2019. [DOI: 10.3920/qas2019.1579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- A. Karadag
- Department of Food Engineering, Yıldız Technical University, 34210, Esenler-Istanbul, Turkey
| | - E. Pelvan
- TÜBİTAK Marmara Research Center, Food Institute, P.O. Box 21, 41470 Gebze-Kocaeli, Turkey
| | - K. Dogan
- Department of Food Engineering, Yıldız Technical University, 34210, Esenler-Istanbul, Turkey
| | - N. Celik
- TÜBİTAK Marmara Research Center, Genetic Engineering and Biotechnology Institute, P.O. Box 21, 41470 Gebze-Kocaeli, Turkey
| | - D. Ozturk
- TÜBİTAK Marmara Research Center, Genetic Engineering and Biotechnology Institute, P.O. Box 21, 41470 Gebze-Kocaeli, Turkey
| | - K. Akalın
- TÜBİTAK Marmara Research Center, Genetic Engineering and Biotechnology Institute, P.O. Box 21, 41470 Gebze-Kocaeli, Turkey
| | - C. Alasalvar
- TÜBİTAK Marmara Research Center, Food Institute, P.O. Box 21, 41470 Gebze-Kocaeli, Turkey
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Karadag A, Dogan K, Pelvan E, Tas A, Eklioglu OA, Aksu S, Alasalvar C. α-Glucosidase inhibitory activities, functional properties, and safety of green tea polysaccharides as a potential source of dietary supplement. ACTA ACUST UNITED AC 2018. [DOI: 10.31665/jfb.2018.3155] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Procuring valuable bioactive compounds from low quality green tea is of great interest. Green tea polysaccharides (GTPS), obtained from low quality tea leaves, were examined for their yield, monosaccharide composition, total phenolic content, antioxidant potential, and structures as well as molecular weight distribution and in vitro anti-diabetic activities. GTPS were also evaluated for their toxicity by performing cytotoxicity and genotoxicity. Additionally, 50% lethal dose (LD50) for GTPS was determined using an acute toxicity test to assess the safe use of it as a dietary supplement. Monosaccharides of GTPS were mainly composed of xylose, glucose, ribose, galactose, arabinose, and glucuronic acid. GTPS exhibited 91.86% α-glucosidase inhibition at 0.5 mg/mL concentration. The α-glucosidase inhibitory activity of GTPS was higher than that of pharmacological glucosidase inhibitor, acarbose, which exhibited only 47.86% inhibition at 2.5 mg/mL concentration. Neither cytotoxic nor no mutagenic effects were found for GTPS. The acute toxicity also showed that LD50 of GTPS was greater than 5,000 mg/kg. The present work suggests that GTPS can be considered as an anti-diabetic dietary supplement without posing any potential health risk.
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Beeckman D, Van den Bussche K, Alves P, Arnold Long M, Beelev H, Ciprandi G, Coyer F, de Groot T, De Meyer D, Deschepper E, Dunk A, Fourie A, García-Molina P, Gray M, Iblasi A, Jelnes R, Johansen E, Karadag A, Leblanc K, Kis Dadara Z, Meaume S, Pokorna A, Romanelli M, Ruppert S, Schoonhoven L, Smet S, Smith C, Steininger A, Stockmayr M, Van Damme N, Voegeli D, Van Hecke A, Verhaeghe S, Woo K, Kottner J. 建立失禁相关性皮炎(IAD)相关国际通用术语:在30个国家/地区进行根特全球(IAD)分类工具(GLOBIAD)心理测量特性的设计和评估. Br J Dermatol 2018. [DOI: 10.1111/bjd.16766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Sirenomelia, also known as “mermaid malformation/syndrome,” is a rare, serious congenital anomaly characterized by variable degrees of fusion of the lower limbs and associated with severe malformations of vertebral, genitourinary, cardiovascular system and single umbilical artery. The first pregnancy of a 25-year-old woman resulted in one twin born by Cesarian section at 32 weeks’ gestation, who was referred to our hospital with cyanosis, a congenital anomaly and respiratory distress. On physical examination, there was no urogenital region and anal fissure and gender was indeterminate. The arms were in adduction and wrist in flexion position with four fingers on the right hand and two fingers on the left hand. There was a single lower extremity with a webbed single foot and two toes consistent with sirenomelia type IV radiologically. Abdominal ultrasonography showed urogenital system agenesis and echocardiography detected hypoplastic left heart. However, the patient died 4 hours after birth. The other twin was followed for 1 week for nutrition and respiratory support and was then discharged without any problems.
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Affiliation(s)
- H Turgut
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
| | - R Ozdemir
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
| | - I K Gokce
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
| | - C Karakurt
- Department of Pediatric Cardiology, Inonu University School of Medicine, Malatya, Turkey
| | - A Karadag
- Division of Neonatology, Department of Pediatrics, Inonu University School of Medicine, Malatya, Turkey
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Orem A, Alasalvar C, Vanizor Kural B, Yaman S, Orem C, Karadag A, Pelvan E, Zawistowski J. Cardio-protective effects of phytosterol-enriched functional black tea in mild hypercholesterolemia subjects. J Funct Foods 2017. [DOI: 10.1016/j.jff.2017.01.048] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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Soyletir G, Altinkanat G, Gur D, Altun B, Tunger A, Aydemir S, Kayacan C, Aktas Z, Gunaydin M, Karadag A, Gorur H, Morrissey I, Torumkuney D. Results from the Survey of Antibiotic Resistance (SOAR) 2011-13 in Turkey. J Antimicrob Chemother 2016; 71 Suppl 1:i71-83. [PMID: 27048584 DOI: 10.1093/jac/dkw075] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES Data are presented from the Survey of Antibiotic Resistance (SOAR) for respiratory tract infection pathogens collected in 2011-13 from Turkey. METHODS MICs were determined using Etest(®). Susceptibility was assessed using CLSI, EUCAST and pharmacokinetic/pharmacodynamic (PK/PD) interpretive criteria. RESULTS Rates of antibiotic susceptibility were very low among 333 isolates of Streptococcus pneumoniae tested: penicillin 38% using CLSI (oral) and EUCAST breakpoints; erythromycin 51% using CLSI and EUCAST criteria; and cefuroxime 64.6% using CLSI and PK/PD and 46.9% using EUCAST. Of the isolates, >90% were susceptible to amoxicillin/clavulanic acid, ceftriaxone (except using EUCAST criteria: 76%), levofloxacin and high-dose intravenous penicillin. Among 339 Haemophilus influenzae isolates, 6.8% were β-lactamase positive while 9.1% were β-lactamase negative but ampicillin resistant (BLNAR) by CLSI (14.7% by EUCAST) criteria. Amoxicillin/clavulanic acid susceptibility was ∼90% by CLSI (with or without BLNAR adjustment, EUCAST and high-dose PK/PD) but lower, at 82.9%, by EUCAST with BLNAR adjustment. Levofloxacin susceptibility was 96% using all three breakpoints. Dramatic differences in rates of susceptibility, depending on the breakpoints used, were seen for cefaclor [94% by CLSI (86.4% BLNAR adjusted), 23% by PK/PD] and cefuroxime [97% by CLSI (89.1% BLNAR adjusted), 85% by PK/PD, 15% by EUCAST (13.0% BLNAR adjusted)]. Streptococcus pyogenes (n = 222) and Moraxella catarrhalis (n = 40) isolates remained highly susceptible to amoxicillin/clavulanic acid, cephalosporins and levofloxacin, with only erythromycin susceptibility dropping below 95% for S. pyogenes. CONCLUSIONS Overall, amoxicillin/clavulanic acid and levofloxacin were the most active antibiotics based on all three breakpoints against these pathogens. Although susceptibility was not universally low in Turkey, high resistance rates were found in S. pneumoniae and, when using PK/PD and EUCAST breakpoints, in other respiratory pathogens.
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Affiliation(s)
- G Soyletir
- Marmara University Medical Faculty, Department of Medical Microbiology, Istanbul, Turkey
| | - G Altinkanat
- Marmara University Medical Faculty, Department of Medical Microbiology, Istanbul, Turkey
| | - D Gur
- Hacettepe University Medical Faculty, Department of Medical Microbiology, Ankara, Turkey
| | - B Altun
- Hacettepe University Medical Faculty, Department of Medical Microbiology, Ankara, Turkey
| | - A Tunger
- Ege University Medical Faculty, Department of Medical Microbiology, Izmir, Turkey
| | - S Aydemir
- Ege University Medical Faculty, Department of Medical Microbiology, Izmir, Turkey
| | - C Kayacan
- Istanbul University, Istanbul Medical Faculty, Department of Medical Microbiology, Istanbul, Turkey
| | - Z Aktas
- Istanbul University, Istanbul Medical Faculty, Department of Medical Microbiology, Istanbul, Turkey
| | - M Gunaydin
- Ondokuz Mayıs University Medical Faculty, Department of Medical Microbiology, Samsun, Turkey
| | - A Karadag
- Ondokuz Mayıs University Medical Faculty, Department of Medical Microbiology, Samsun, Turkey
| | - H Gorur
- GlaxoSmithKline Turkey, Buyukdere Cad. 1. Levent Plaza, No. 173, B Blok, 34394, Istanbul, Turkey
| | - I Morrissey
- IHMA Europe Sàrl, 9A route de la Corniche, Epalinges 1066, Switzerland
| | - D Torumkuney
- GlaxoSmithKline, 980 Great West Road, Brentford, Middlesex TW8 9GS, UK
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Elmas AT, Karadag A, Tabel Y, Ozdemir R, Otlu G. Analysis of urine biomarkers for early determination of acute kidney injury in non-septic and non-asphyxiated critically ill preterm neonates. J Matern Fetal Neonatal Med 2016; 30:302-308. [PMID: 27020372 DOI: 10.3109/14767058.2016.1171311] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE We designed the present study to test the hypothesis that urinary biomarkers might predict acute kidney injury (AKI) development in non-septic and non-asphyxiated critically ill preterm infants. We evaluated urine (u) sistatin-C (uCys-C), kidney injury molecule-1 (uKIM-1) and neutrophil gelatinase associate lipocaline (uNGAL) as markers of AKI. METHODS Sixty-four preterm infants with gestational age between 28 and 32 weeks were included in this study. Biomarkers were measured on day of life (DOL) 1, 3, and 7. RESULTS uNGAL levels in the AKI group were significantly higher than in no-AKI group on DOL 1, 3 and 7 (p = 0.016, p = 0.007 and p = 0.0014, respectively). CONCLUSIONS uNGAL is sensitive, early, and noninvasive AKI biomarkers, increasing significantly in non-septic and non-asphyxiated critically ill preterm neonates.
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Affiliation(s)
- A T Elmas
- a Department of Pediatric Nephrology
| | | | - Y Tabel
- a Department of Pediatric Nephrology
| | | | - G Otlu
- c Department of Biochemistry , İnönü University Medical Faculty , Malatya , Turkey
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Yanik K, Tanriverdi Cayci Y, Karadag A, Esen S, Gunaydin M. Evaluation of the antibiotic resistance of Pseudomonas aeruginosa isolates according to the changing guidelines. Indian J Med Microbiol 2016; 34:123-4. [DOI: 10.4103/0255-0857.174107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Karadag A. Application of peak nasal inspiratory flow reference values in the treatment of allergic rhinitis. Comment. Rhinology 2014; 52:444. [PMID: 25638823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
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Yildirim M, Amanvermez R, Polat C, Karadag A, Karayigit MO, Erzurumlu K. The olive leaf extract attenuates bacterial translocation and liver damage in obstructive jaundice. ACTA ACUST UNITED AC 2014; 115:357-61. [PMID: 25023426 DOI: 10.4149/bll_2014_070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVES The olive leaf extract (OLext) is known to possess many biological properties including a powerful antioxidant. This study aimed to investigate the protective effects of postoperative nutrition with OLext and glutamine on bacterial translocation (BT) and liver damage in obstructive jaundice. MATERIALS AND METHODS Totally, 50 rats were randomly divided into the five groups of 10 each. The common bile duct was ligated in all animals, excepting in the group 1. Postoperative nutrition was given to all groups for ten days. The rats in the Group 1 and 2 were fed a normal diet, Group 3 rats were fed an additional glutamine (1 g/kg/day), and Group 4 and 5 rats were fed an additional OLext (1 ml of 1/2 diluted and pure form/kg/day). Biochemical, microbiological and liver histopathological changes were evaluated. RESULTS BT in the Groups 3, 4, and 5 was significantly lower than in the Group 2. The values of aspartate transaminase (AST), alanine transaminase (ALT), γ-glutamyl transferase (γ-GT) and alkalen phosphatase (ALP) in blood were increased in obstructive jaundice, but the levels of these tests were statistically lower in glutamine and OLext groups when compared to the Group 2. Histopathological changes were observed low in the liver in OLext and glutamine groups. CONCLUSIONS The present data has demonstrated that the supplementation of olive leaf extract and glutamine reduce the incidence of BT and liver damage in obstructive jaundiced rats (Tab. 4, Fig. 1, Ref. 23).
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Abstract
High-pressure homogenization (HPH) was used to increase the water solubility of quercetin crystals, which exhibit antioxidant, anti-inflammatory, and anticancer properties but poor water solubility and oral bioavailability. The improved water solubility of quercetin by HPH treatment could be attributed to very fine suspensions produced in the nanometric range (~400 nm) and loss of crystallinity caused by mechanical friction and stresses, which were verified by particle size measurements, differential scanning calorimetry (DSC), atomic force microscopy (AFM), and scanning electron microscopy (SEM) results. Easily water redispersible powders were fabricated by the combination of HPH treatment and spray-drying process when maltodextrin was used as a carrier agent. HPH-treated spray-dried powders exhibited higher antioxidant activities than nontreated samples through increased water dispersity in terms of radical scavenging activity, reducing ability, and oxygen radical absorbance capacity determinations. This study suggests that the combination of HPH treatment with spray-drying would be an excellent processing method for the development of quercetin-based functional food products.
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Affiliation(s)
- Ayse Karadag
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University , 34469 Maslak, Istanbul, Turkey
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Musial K, Zwolinska D, Pruthi R, Sinha M, Casula A, Lewis M, Tse Y, Maxwell H, O'Brien C, Inward C, Sharaf E, Fadel F, Bazaraa H, Hegazy R, Essam R, Manickavasagar B, Shroff R, McArdle A, Ledermann S, Shaw V, Van't Hoff W, Paudyal B, Prado G, Schoeneman M, Nepal MK, Feygina V, Bansilal V, Tawadrous H, Mongia AK, Melk A, Kracht D, Doyon A, Zeller R, Litwin M, Duzowa A, Sozeri B, Bayzit A, Caliskan S, Querfeld U, Wuhl E, Schaefer F, Schmidt B, Canpolat N, Caliskan S, Kara Acar M, Pehlivan S, Tasdemir M, Sever L, Nusken E, Taylan C, von Gersdorff G, Schaller M, Barth C, Dotsch J, Roomizadeh P, Gheissari A, Abedini A, Garzotto F, Zanella M, Kim J, Cena R, Neri M, Nalesso F, Brendolan A, Ronco C, Canpolat N, Sever L, Celkan T, Lacinel S, Tasdemir M, Keser A, Caliskan S, Taner Elmas A, Tabel Y, Ipek S, Karadag A, Elmas O, Ozyalin F, Hoxha (Qosja) A, Gjyzari A, Tushe E, Said RM, Abdel Fattah MA, Soliman DA, Mahmoud SY, Hattori M, Uemura O, Hataya H, Ito S, Hisano M, Ohta T, Fujinaga S, Kise T, Goto Y, Matsunaga A, Hashimoto T, Tsutsumi Y, Ito N, Akizawa T, Maher S, Cho BS, Choi YM, Suh JS, Farid F, El-Hakim I, Salman M, Rajnochova Bloudickova S, Viklicky O, Seeman T, Yuksel S, Caglar M, Becerir T, Tepeli E, Calli Demirkan N, Yalcin N, Ergin A, Hladik M, Sigutova R, Vsiansky F, Safarcik K, Svagera Z, Abd El Monem Soliman N, Bazaraa HM, Nabhan MM, Badr AM, Abd El Latif Shahin M, Skrzypczyk P, Panczyk-Tomaszewska M, Roszkowska-Blaim M, Wawer Z, Bienias B, Zajaczkowska M, Szczepaniak M, Pawlak-Bratkowska M, Tkaczyk M, Kilis-Pstrusinska K, Jakubowska A, Prikhodina L, Ryzhkova O, Poltavets N, Polyakov V. Paediatric nephrology II. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Karadag A, Yang X, Ozcelik B, Huang Q. Optimization of preparation conditions for quercetin nanoemulsions using response surface methodology. J Agric Food Chem 2013; 61:2130-2139. [PMID: 23330985 DOI: 10.1021/jf3040463] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Response surface methodology was used to optimize the conditions for quercetin (QT) nanoemulsion preparations. The parameters to produce stable coarse emulsion formulations, which contain limonene oil, emulsifiers consisting of a Tween 80 and Span 20 mixture (1:1 weight ratio), and a water phase, using high-speed homogenization were identified by using the pseudoternary phase diagram. Subsequently, QT loading was kept constant (0.25%, w/w), and the effects of the oil (10-20%, w/w) and emulsifier (5-15%, w/w) concentrations as well as the homogenization pressure (52-187 MPa) on the particle sizes and emulsion stability were investigated. Experimental data could be adequately fit into a second-order polynomial model with a multiple regression coefficient (R(2)) of 0.9171 for the particle size. R(2) values were found to be 0.8545 for the droplet growth ratio during storage and 0.7795 for QT stability. According to the model, major factors affecting particle sizes include the pressure, emulsifier and oil concentrations, and interaction between pressure and oil concentration. The pressure, oil concentration, and interaction terms between the emulsifier and oil concentrations as well as between the pressure and emulsifier concentration had a significant impact on the droplet growth ratio. Regarding the quercetin stability in nanoemulsions, only the oil concentration and interaction term between the oil and emulsifier concentrations had a significant effect. Optimum formulation and conditions for minimum particle size and the highest stability were found at 13% mixed emulsifiers, 17% oil content, and 70 MPa homogenization pressure. This study also suggested that the loading of QT in nanoemulsions could significantly affect the particle sizes and the stability of emulsions depending on the oil:emulsifier ratio in the system.
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Affiliation(s)
- Ayse Karadag
- Department of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University , 34469 Maslak, Istanbul, Turkey
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Karadag A, Özçelik B, Sramek M, Gibis M, Kohlus R, Weiss J. Presence of Electrostatically Adsorbed Polysaccharides Improves Spray Drying of Liposomes. J Food Sci 2013; 78:E206-21. [DOI: 10.1111/1750-3841.12023] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 11/14/2012] [Indexed: 12/01/2022]
Affiliation(s)
- Ayse Karadag
- Dept. of Food Engineering, Faculty of Chemical and Metallurgical Engineering; Istanbul Technical Univ.; 34469; Maslak; Istanbul; Turkey
| | - Beraat Özçelik
- Dept. of Food Engineering, Faculty of Chemical and Metallurgical Engineering; Istanbul Technical Univ.; 34469; Maslak; Istanbul; Turkey
| | - Martin Sramek
- Dept. of Food Processing, Inst. of Food Science and Biotechnology; Univ. of Hohenheim; Garbenstrasse 25; 70599; Stuttgart; Germany
| | - Monika Gibis
- Dept. of Food Physics and Meat Science, Inst. of Food Science and Biotechnology; Univ. of Hohenheim; Garbenstrasse 25; 70599; Stuttgart; Germany
| | - Reinhard Kohlus
- Dept. of Food Processing, Inst. of Food Science and Biotechnology; Univ. of Hohenheim; Garbenstrasse 25; 70599; Stuttgart; Germany
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Simsek N, Bulut ET, Yalcin M, Karadag A. A new finding in glutaric acidemia type II: dental anomalies. Genet Couns 2013; 24:251-252. [PMID: 24032299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
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Gumus Dogan D, Aslan M, Ozkurt D, Karadag A. Oropharyngeal CPAP: a new CPAP technique for newborns with nasal anomaly. Minerva Anestesiol 2010; 76:1097. [PMID: 21102399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Cikrikcioglu MA, Erkal H, Hursitoglu M, Karadag A, Gundogan E, Kayacan SM, Tukek T. Idiopathic portal hypertension during a catastrophic attack in a patient with primary antiphospholipid syndrome. Acta Gastroenterol Belg 2010; 73:521-526. [PMID: 21299166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A 43-year old male patient with hyponatremic hypertensive syndrome was diagnosed as catastrophic primary antiphospholipid syndrome (PAPS). He subsequently developed hepatosplenomegaly. The patient also carried thrombophilia- and haemochromatosis-associated gene mutations. Further investigations upon persistence of splenomegaly indicated development of idiopathic portal hypertension.
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Affiliation(s)
- M A Cikrikcioglu
- Vakif Gureba Training and Research Hospital, Fatih, Istanbul, Turkey.
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Arslan C, Koz M, Gür E, Karadag A. Examination of relationship between 30 second wingate test performance and spirometric respiratory functions in young adults. Biol Sport 2009. [DOI: 10.5604/20831862.890236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Özcelik B, Karadag A, Cinbas T, Yolci P. Influence of Extraction Time and Different Sage Varieties on Sensory Characteristics of a Novel Functional Beverage by RSM. FOOD SCI TECHNOL INT 2009. [DOI: 10.1177/1082013208105989] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
An optimized formulation was developed for the preparation of an `ice-sage tea' which might be considered to be a new healthy functional product and designed as an alternative to other cold-served drinks in the market. A central composite design was used for modeling of the experiment with two independent variables (extraction time and blending ratios of two different sage varieties: Salvia officinalis (SO) and Salvia sclarea (SC)). Flavor profile of this novel product was developed using descriptive sensory analysis techniques; consumer acceptability of the product was also tested. Blending SO with SC was expected to increase the positive health effects of this novel product, while there was a limit for its concentration at increased extraction times. According to the evaluation of experienced panelists, blending common sage SO with SC did not reduce the overall likeability of this novel product at low extraction times. Statistically, just two models for astringency and overall impression were found to be acceptable by taking into consideration their regression coefficient and probability values. On the other hand, consumer test results showed that the samples prepared by blending SO with SC up to 25% might increase the likeability scores of the product when compared to the product without SC.
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Affiliation(s)
- B. Özcelik
- Department of Food Engineering, Faculty of Chemical and Metallurgical Istanbul Technical University, Maslak 34469, Istanbul, Turkey,
| | - A. Karadag
- Department of Food Engineering, Faculty of Chemical and Metallurgical Istanbul Technical University, Maslak 34469, Istanbul, Turkey
| | - T. Cinbas
- Department of Food Engineering, Faculty of Chemical and Metallurgical Istanbul Technical University, Maslak 34469, Istanbul, Turkey
| | - P. Yolci
- Department of Food Engineering, Faculty of Chemical and Metallurgical Istanbul Technical University, Maslak 34469, Istanbul, Turkey
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Gumus-akay G, Rustemoglu A, Karadag A, Sunguroglu A. Genotype and allele frequencies of MDR1 gene C1236T polymorphism in a Turkish population. Genet Mol Res 2008. [DOI: 10.4238/vol7-4gmr496] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Uras N, Karadag A, Odemis E, Mete E, Degirmencioglu H, Turkay S, Tatli MM. Aortic and pulmonary valve stenosis in a neonate: a new finding of prune belly syndrome? Genet Couns 2007; 18:125-7. [PMID: 17515309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
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Karadag A, Odemis E, Uras N, Gunlemez A. Soy formulas and hypothyroidism. Arch Dis Child 2004; 89:1077. [PMID: 15499073 PMCID: PMC1719703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
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Avci Z, Koktener A, Uras N, Catal F, Karadag A, Tekin O, Degirmencioglu H, Baskin E. Nephrolithiasis associated with ceftriaxone therapy: a prospective study in 51 children. Arch Dis Child 2004; 89:1069-72. [PMID: 15499067 PMCID: PMC1719698 DOI: 10.1136/adc.2003.044156] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Ceftriaxone, a third generation cephalosporin, is widely used for treating infection during childhood. The kidneys eliminate approximately 33-67% of this agent, and the remainder is eliminated via the biliary system. Ceftriaxone may bind with calcium ions and form insoluble precipitate leading to biliary pseudolithiasis. The aim of this study was to assess whether ceftriaxone associated nephrolithiasis develops by the same mechanism, and whether this condition is dose related. METHODS The study involved 51 children with various infections. Of these, 24 were hospitalized with severe infection and received 100 mg/kg/day ceftriaxone divided into two equal intravenous doses. The other 27 patients received a single daily intramuscular injection of 50 mg/kg/day. Serum and urine parameters were evaluated before and after treatment, and abdominal ultrasonographic examinations were also carried out before and after treatment. RESULTS Serum urea, creatinine, and calcium levels were normal in all patients before and after treatment. Post-treatment ultrasound identified nephrolithiasis in four (7.8%) of the 51 subjects. The stones were all of small size (2 mm). Comparison of the groups with and without nephrolithiasis revealed no significant differences with respect to age, sex distribution, duration of treatment, or dose/route of administration of ceftriaxone. The renal stones disappeared spontaneously in three of the four cases, but were still present in one patient 7 months after ceftriaxone treatment. CONCLUSIONS Conclusions: The study showed that children taking a 7 day course of normal or high dose ceftriaxone may develop small sized asymptomatic renal stones. The overall incidence of nephrolithiasis in this study was 7.8%.
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Affiliation(s)
- Z Avci
- Department of Pediatrics, Faculty of Medicine, Bakent University, Ankara, Turkey
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Fedarko NS, Jain A, Karadag A, Van Eman MR, Fisher LW. Elevated serum bone sialoprotein and osteopontin in colon, breast, prostate, and lung cancer. Clin Cancer Res 2001; 7:4060-6. [PMID: 11751502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
PURPOSE Histological studies have shown that the two sialoproteins, bone sialoprotein (BSP) and osteopontin (OPN), are induced in multiple types of cancer. We have recently found that these proteins are bound in serum to complement factor H and that the complex must be disrupted to generate free protein to measure their total levels. We hypothesized that measuring total BSP and OPN levels would provide informative markers for the detection of cancer. EXPERIMENTAL DESIGN As a proof of concept study, serum from patients with diagnosed breast, colon, lung, or prostate cancer (n = 20 for each type) as well as normal serum (n = 77) were analyzed using competitive ELISAs developed for BSP and OPN. Sensitivity, specificity, as well as positive and negative predictive values were determined for each sialoprotein and cancer type. The relationship between sensitivity and specificity was profiled by receiver operating characteristic curves. RESULTS AND CONCLUSIONS Determined values for serum BSP in ng/ml were 285 +/- 19 for prostate, 373 +/- 19 for colon, 318 +/- 18 for breast, 155 +/- 11 for lung cancer sera, and 154 +/- 13 for normal sera. Values of OPN in ng/ml were 653 +/- 39 for prostate, 449 +/- 22 for colon, 814 +/- 53 for breast, 724 +/- 33 for lung, and 439 +/- 30 for normal sera. The assays provide a high degree of sensitivity and specificity that enables the detection of colon, breast, prostate, and lung cancer.
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Affiliation(s)
- N S Fedarko
- Division of Geriatrics, Department of Medicine, The Johns Hopkins University School of Medicine, 5501 Hopkins Bayview Circle, Baltimore, MD 21224, USA.
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Karadag A, Scutt AM, Croucher PI. Human myeloma cells promote the recruitment of osteoblast precursors: mediation by interleukin-6 and soluble interleukin-6 receptor. J Bone Miner Res 2000; 15:1935-43. [PMID: 11028445 DOI: 10.1359/jbmr.2000.15.10.1935] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Multiple myeloma is associated with the development of osteolytic bone disease characterized by a disruption to normal bone resorption and bone formation. Although studies have shown that myeloma cells produce factors that promote bone resorption little data are available examining the mechanism of decreased bone formation or the factors that mediate this effect. In the present study we describe a novel in vitro coculture system in which to investigate the effect of myeloma cells on osteoblast recruitment and differentiation. Under appropriate conditions mesenchymal stem cells were shown to differentiate into colonies of cells, a proportion of which show characteristics of osteoblasts, in that they express alkaline phosphatase activity and stain positively for collagen and calcium. The addition of the human myeloma cells JJN-3, RPMI-8226, or NCI-H929 to these cultures stimulated a significant increase in the total number of colonies (p < 0.005) and the proportion of osteoblastic colonies (p < 0.005). Media conditioned by these cells also were able to promote the formation of both total and osteoblastic colonies (p < 0.005). The addition of an antibody against the interleukin-6 receptor (IL-6R) blocked myeloma cell and myeloma cell-conditioned media induced osteoblast recruitment (p < 0.01). Furthermore, media conditioned by myeloma cells incubated with phorbol ester, which promotes IL-6R shedding, or a metalloproteinase inhibitor, which inhibits IL-6R shedding, were able to stimulate (p < 0.005) and inhibit osteoblast recruitment (p < 0.005), respectively. In addition, soluble IL-6R (sIL-6R) and IL-6 together, but not alone, were able to promote osteoblastic colony formation (p < 0.01). Taken together these data show that myeloma cells promote osteoblast recruitment by release of sIL-6R from myeloma cells.
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Affiliation(s)
- A Karadag
- Division of Biochemical and Musculoskeletal Medicine, University of Sheffield Medical School, United Kingdom
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Abstract
Interleukin-6 (IL-6) is an important growth and survival factor for myeloma cells. However, the identity of the cells producing IL-6 in vivo remains unclear. Myeloma cells are found closely associated with sites of active bone turnover, and cells of the osteogenic lineage, including bone marrow osteoprogenitors, osteoblasts and bone lining cells, may therefore be ideally placed to synthesize IL-6. We have examined the possibility that human osteogenic cells may produce IL-6 in response to stimulation by myeloma cells. Primary human osteoblasts (hOBs) were isolated from normal donors, co-cultured with the human myeloma cell lines, JJN-3, RPMI-8226 and NCI-H929, and the amount of IL-6 released was determined by enzyme-linked immunosorbent assay (ELISA). All myeloma cells stimulated a significant increase in the production of IL-6 when cultured with hOBs (P < 0.05). Prior fixation of hOBs completely abrogated release of IL-6 in the co-cultures. In contrast, fixed myeloma cells retained the ability to induce IL-6 production, suggesting that hOBs were the principal source of IL-6. Physical separation of myeloma cells from hOBs using transwell inserts caused a partial inhibition of IL-6 release (P < 0.05), whereas the addition of media conditioned by myeloma cells to cultures of hOBs stimulated a significant increase in IL-6 production (P < 0.05). hOBs secreted greater amounts of IL-6 than human bone marrow stromal cells (hBMSCs) (2.2- to 3.5-fold, P < 0.05), but incubating hBMSCs with dexamethasone to stimulate osteoblastic differentiation resulted in an increase in their ability to produce IL-6 (1.7- to 4. 8-fold, P < 0.05) and to respond to myeloma cells (P < 0.05). These data clearly indicate that cells of the osteoblast lineage release significant amounts of IL-6 in response to stimulation by myeloma cells and may contribute to the IL-6 that promotes the proliferation and survival of myeloma cells in vivo.
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Affiliation(s)
- A Karadag
- Division of Biochemical and Musculoskeletal Medicine, University of Sheffield Medical School, Sheffield, UK
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