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Leite MDMR, Bobrowski Rodrigues D, Brison R, Nepomuceno F, Bento ML, de Oliveira LDL. A Scoping Review on Carotenoid Profiling in Passiflora spp.: A Vast Avenue for Expanding the Knowledge on the Species. Molecules 2024; 29:1585. [PMID: 38611864 PMCID: PMC11013783 DOI: 10.3390/molecules29071585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 03/02/2024] [Accepted: 03/04/2024] [Indexed: 04/14/2024] Open
Abstract
The Passiflora genus is recognised for its ethnopharmacological, sensorial, and nutritional significance. Yet, the screening of its dietary and bioactive molecules has mainly targeted hydrophilic metabolites. Following the PRISMA-P protocol, this review assessed the current knowledge on carotenoid composition and analysis within Passiflora, examining 968 records from seven databases and including 17 studies focusing on carotenoid separation and identification in plant parts. Those publications originated in America and Asia. P. edulis was the most frequently examined species of a total of ten, while pulp was the most studied plant part (16 studies). Carotenoid analysis involved primarily high-performance liquid chromatography separation on C18 columns and detection using diode array detectors (64.71%). Most studies identified the provitamin A β-carotene and xanthophylls lutein and zeaxanthin, with their geometric configuration often neglected. Only one study described carotenoid esters. Besides the methodology's insufficient description, the lack of use of more accurate techniques and practices led to a high risk of bias in the carotenoid assignment in 17.65% of the articles. This review highlights the opportunity to broaden carotenoid studies to other species and parts within the diverse Passiflora genus, especially to wild, locally available fruits, which may have a strategic role in enhancing food diversity and security amidst climatic changes. Additionally, it urges the use of more accurate and efficient analytical methods based on green chemistry to better identify Passiflora carotenoids.
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Affiliation(s)
- Marina de Macedo Rodrigues Leite
- Department of Nutrition, University of Brasília (UnB), Campus Darcy Ribeiro, Brasilia 70910-900, DF, Brazil; (M.d.M.R.L.); (R.B.); (F.N.); (L.d.L.d.O.)
| | - Daniele Bobrowski Rodrigues
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
- Laboratório Associado para a Sustentabilidade e Tecnologia em Regiões de Montanha (SusTEC), Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
| | - Raquel Brison
- Department of Nutrition, University of Brasília (UnB), Campus Darcy Ribeiro, Brasilia 70910-900, DF, Brazil; (M.d.M.R.L.); (R.B.); (F.N.); (L.d.L.d.O.)
| | - Fernanda Nepomuceno
- Department of Nutrition, University of Brasília (UnB), Campus Darcy Ribeiro, Brasilia 70910-900, DF, Brazil; (M.d.M.R.L.); (R.B.); (F.N.); (L.d.L.d.O.)
| | - Maria Lua Bento
- Department of Pharmacy, University of Brasília (UnB), Campus de Ceilândia, Brasilia 72220-275, DF, Brazil;
| | - Lívia de Lacerda de Oliveira
- Department of Nutrition, University of Brasília (UnB), Campus Darcy Ribeiro, Brasilia 70910-900, DF, Brazil; (M.d.M.R.L.); (R.B.); (F.N.); (L.d.L.d.O.)
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López GD, Suesca E, Álvarez-Rivera G, Rosato AE, Ibáñez E, Cifuentes A, Leidy C, Carazzone C. Carotenogenesis of Staphylococcus aureus: New insights and impact on membrane biophysical properties. Biochim Biophys Acta Mol Cell Biol Lipids 2021; 1866:158941. [PMID: 33862238 DOI: 10.1016/j.bbalip.2021.158941] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/18/2021] [Accepted: 03/31/2021] [Indexed: 11/30/2022]
Abstract
Staphyloxanthin (STX) is a saccharolipid derived from a carotenoid in Staphylococcus aureus involved in oxidative-stress tolerance and antimicrobial peptide resistance. STX influences the biophysical properties of the bacterial membrane and has been associated to the formation of lipid domains in the regulation of methicillin-resistance. In this work, a targeted metabolomics and biophysical characterization study was carried out to investigate the biosynthetic pathways of carotenoids, and their impact on the membrane biophysical properties. Five different S. aureus strains were investigated, including three wild-type strains containing the crtM gene related to STX biosynthesis, a crtM-deletion mutant, and a crtMN plasmid-complemented variant. LC-DAD-MS/MS analysis of extracts allowed the identification of 34 metabolites related to carotenogenesis in S. aureus at different growth phases (8, 24 and 48 h), showing the progression of these metabolites as the bacteria advances into the stationary phase. For the first time, 22 members of a large family of carotenoids were identified, including STX and STX-homologues, as well as Dehydro-STX and Dehydro-STX-homologues. Moreover, thermotropic behavior of the CH2 stretch of lipid acyl chains in live cells by FTIR, show that the presence of STX increases acyl chain order at the bacterial growth temperature. Indeed, the cooperative melting event of the bacterial membrane, which occurs around 15 °C in the native strains, shifts with increased carotenoid content. These results show the diversity biosynthetic of carotenoids in S. aureus, and their influence on membrane biophysical properties.
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Affiliation(s)
- Gerson-Dirceu López
- Laboratory of Advanced Analytical Techniques in Natural Products (LATNAP), Chemistry Department, Universidad de los Andes, Bogotá D.C., Colombia; Laboratory of Biophysics, Physics Department, Universidad de los Andes, Bogotá D.C., Colombia; Laboratory of Foodomics, Institute of Food Science Research, CIAL, CSIC, Madrid, Spain
| | - Elizabeth Suesca
- Laboratory of Biophysics, Physics Department, Universidad de los Andes, Bogotá D.C., Colombia
| | | | - Adriana E Rosato
- Molecular Microbiology Diagnostics-Research, Riverside University Health System, Professor Loma Linda University, Moreno Valley, CA, USA
| | - Elena Ibáñez
- Laboratory of Foodomics, Institute of Food Science Research, CIAL, CSIC, Madrid, Spain
| | - Alejandro Cifuentes
- Laboratory of Foodomics, Institute of Food Science Research, CIAL, CSIC, Madrid, Spain
| | - Chad Leidy
- Laboratory of Biophysics, Physics Department, Universidad de los Andes, Bogotá D.C., Colombia.
| | - Chiara Carazzone
- Laboratory of Advanced Analytical Techniques in Natural Products (LATNAP), Chemistry Department, Universidad de los Andes, Bogotá D.C., Colombia.
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Dini I, Laneri S. The New Challenge of Green Cosmetics: Natural Food Ingredients for Cosmetic Formulations. Molecules 2021; 26:molecules26133921. [PMID: 34206931 PMCID: PMC8271805 DOI: 10.3390/molecules26133921] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/21/2021] [Accepted: 06/25/2021] [Indexed: 01/18/2023] Open
Abstract
Nowadays, much attention is paid to issues such as ecology and sustainability. Many consumers choose “green cosmetics”, which are environmentally friendly creams, makeup, and beauty products, hoping that they are not harmful to health and reduce pollution. Moreover, the repeated mini-lock downs during the COVID-19 pandemic have fueled the awareness that body beauty is linked to well-being, both external and internal. As a result, consumer preferences for makeup have declined, while those for skincare products have increased. Nutricosmetics, which combines the benefits derived from food supplementation with the advantages of cosmetic treatments to improve the beauty of our body, respond to the new market demands. Food chemistry and cosmetic chemistry come together to promote both inside and outside well-being. A nutricosmetic optimizes the intake of nutritional microelements to meet the needs of the skin and skin appendages, improving their conditions and delaying aging, thus helping to protect the skin from the aging action of environmental factors. Numerous studies in the literature show a significant correlation between the adequate intake of these supplements, improved skin quality (both aesthetic and histological), and the acceleration of wound-healing. This review revised the main foods and bioactive molecules used in nutricosmetic formulations, their cosmetic effects, and the analytical techniques that allow the dosage of the active ingredients in the food.
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Alrifai O, Hao X, Liu R, Lu Z, Marcone MF, Tsao R. LED-Induced Carotenoid Synthesis and Related Gene Expression in Brassica Microgreens. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:4674-4685. [PMID: 33861063 DOI: 10.1021/acs.jafc.1c00200] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, various ratios of combined red, blue, and amber light-emitting diodes (rbaLEDs) were investigated for their effect on the expression of carotenoid biosynthetic genes and carotenoid accumulation in eight Brassica microgreens. Total and individual (β-carotene, lutein, α-carotene, neoxanthin, and violaxanthin) carotenoids were increased 20-44 and 10-55%, respectively, under dose-dependent increasing amber-blue light and decreasing red in most microgreens. Lipophilic 2,2-diphenyl-1-picrylhydrazyl and ferric reducing antioxidant power antioxidant activities were significantly increased under higher amber and blue light fractions, while oxygen radical absorbance capacity was generally decreased. Under rbaLED in mizuna (B. rapa) microgreens, the lycopene epsilon cyclase (LYCε) expression was 10-15-fold higher, which resulted in downstream accumulation of α-carotene and lutein. Lycopene beta cyclase (LYCβ) was not significantly changed, suggesting that β-carotene, violaxanthin and neoxanthin were mainly controlled by upstream phytoene synthase and branch-point LYCε. Increased beta-ring carotenoid hydroxylase (CHXβ) expression was also consistent with lutein accumulation. This study demonstrated for the first time that amber LED was involved in the regulatory mechanism of carotenoid biosynthesis, thus a potential novel approach to production of antioxidant-rich microgreens.
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Affiliation(s)
- Oday Alrifai
- Guelph Research & Development Center, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
- Department of Food Science, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Xiuming Hao
- Harrow Research & Development Center, Agriculture and Agri-Food Canada, 2585 County Road 20, Harrow, Ontario N0R 1G0, Canada
| | - Ronghua Liu
- Guelph Research & Development Center, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
| | - Zhanhui Lu
- Guelph Research & Development Center, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
| | - Massimo F Marcone
- Department of Food Science, Ontario Agricultural College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Rong Tsao
- Guelph Research & Development Center, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, Ontario N1G 5C9, Canada
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Xu Z, Xue T, He T. Investigation on the chiral recognition mechanism between verteporfin and cholate salts by capillary electrophoresis. J Sep Sci 2020; 43:2905-2913. [DOI: 10.1002/jssc.202000026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Revised: 04/04/2020] [Accepted: 04/14/2020] [Indexed: 01/08/2023]
Affiliation(s)
- Zhongqi Xu
- College of ChemistryChemical Engineering and BiotechnologyDonghua University Shanghai 201620 P. R. China
| | - Tianfeng Xue
- College of ChemistryChemical Engineering and BiotechnologyDonghua University Shanghai 201620 P. R. China
| | - Tao He
- College of ChemistryChemical Engineering and BiotechnologyDonghua University Shanghai 201620 P. R. China
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Cortés-Herrera C, Artavia G, Leiva A, Granados-Chinchilla F. Liquid Chromatography Analysis of Common Nutritional Components, in Feed and Food. Foods 2018; 8:E1. [PMID: 30577557 PMCID: PMC6352167 DOI: 10.3390/foods8010001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/28/2018] [Accepted: 11/05/2018] [Indexed: 12/20/2022] Open
Abstract
Food and feed laboratories share several similarities when facing the implementation of liquid-chromatographic analysis. Using the experience acquired over the years, through application chemistry in food and feed research, selected analytes of relevance for both areas were discussed. This review focused on the common obstacles and peculiarities that each analyte offers (during the sample treatment or the chromatographic separation) throughout the implementation of said methods. A brief description of the techniques which we considered to be more pertinent, commonly used to assay such analytes is provided, including approaches using commonly available detectors (especially in starter labs) as well as mass detection. This manuscript consists of three sections: feed analysis (as the start of the food chain); food destined for human consumption determinations (the end of the food chain); and finally, assays shared by either matrices or laboratories. Analytes discussed consist of both those considered undesirable substances, contaminants, additives, and those related to nutritional quality. Our review is comprised of the examination of polyphenols, capsaicinoids, theobromine and caffeine, cholesterol, mycotoxins, antibiotics, amino acids, triphenylmethane dyes, nitrates/nitrites, ethanol soluble carbohydrates/sugars, organic acids, carotenoids, hydro and liposoluble vitamins. All analytes are currently assayed in our laboratories.
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Affiliation(s)
- Carolina Cortés-Herrera
- Centro Nacional de Ciencia y Tecnología de Alimentos (CITA), Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio 11501-2060, Costa Rica.
| | - Graciela Artavia
- Centro Nacional de Ciencia y Tecnología de Alimentos (CITA), Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio 11501-2060, Costa Rica.
| | - Astrid Leiva
- Centro de Investigación en Nutrición Animal, Universidad de Costa Rica, Ciudad Universitaria Rodrigo 11501-2060, Costa Rica.
| | - Fabio Granados-Chinchilla
- Centro de Investigación en Nutrición Animal, Universidad de Costa Rica, Ciudad Universitaria Rodrigo 11501-2060, Costa Rica.
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An integrated approach combining HPLC, GC/MS, NIRS, and chemometrics for the geographical discrimination and commercial categorization of saffron. Food Chem 2018; 253:284-292. [DOI: 10.1016/j.foodchem.2018.01.140] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 01/22/2018] [Accepted: 01/22/2018] [Indexed: 11/17/2022]
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Kang EH, Choi TL. Coil-to-Rod Transition of Conjugated Polymers Prepared by Cyclopolymerization of 1,6-Heptadiynes. ACS Macro Lett 2013; 2:780-784. [PMID: 35606980 DOI: 10.1021/mz400338p] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the conformational change resulting from the coil-to-rod transition in conjugated polymers prepared by the cyclopolymerization of 1,6-heptadiyne derivatives (poly(cyclopentenylene-vinylene), PCPV). By aging a PCPV solution under various conditions, we observed dramatic changes in their absorption spectra (appearance of a 0-0 vibronic peak) and an increase in the Mark-Houwink-Sakurada shape parameter, thereby confirming the coil-to-rod transition of the polymer. Further studies using NMR spectroscopy and various control experiments demonstrated that the coil-to-rod transformation resulted from the cis-to-trans isomerization of the conjugated olefins by a radical mechanism.
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Affiliation(s)
- Eun-Hye Kang
- Department of Chemistry, Seoul National University, Seoul 151-747,
Korea
| | - Tae-Lim Choi
- Department of Chemistry, Seoul National University, Seoul 151-747,
Korea
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Cámara M, de Cortes Sánchez-Mata M, Fernández-Ruiz V, Cámara RM, Manzoor S, Caceres JO. Lycopene. STUDIES IN NATURAL PRODUCTS CHEMISTRY 2013. [DOI: 10.1016/b978-0-444-59603-1.00011-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Grune T, Lietz G, Palou A, Ross AC, Stahl W, Tang G, Thurnham D, Yin SA, Biesalski HK. Beta-carotene is an important vitamin A source for humans. J Nutr 2010; 140:2268S-2285S. [PMID: 20980645 PMCID: PMC3139236 DOI: 10.3945/jn.109.119024] [Citation(s) in RCA: 287] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Experts in the field of carotenoids met at the Hohenheim consensus conference in July 2009 to elucidate the current status of β-carotene research and to summarize the current knowledge with respect to the chemical properties, physiological function, and intake of β-carotene. The experts discussed 17 questions and reached an agreement formulated in a consensus answer in each case. These consensus answers are based on published valid data, which were carefully reviewed by the individual experts and are justified here by background statements. Ascertaining the impact of β-carotene on the total dietary intake of vitamin A is complicated, because the efficiency of conversion of β-carotene to retinol is not a single ratio and different conversion factors have been used in various surveys and following governmental recommendations within different countries. However, a role of β-carotene in fulfilling the recommended intake for vitamin A is apparent from a variety of studies. Thus, besides elucidating the various functions, distribution, and uptake of β-carotene, the consensus conference placed special emphasis on the provitamin A function of β-carotene and the role of β-carotene in the realization of the required/recommended total vitamin A intake in both developed and developing countries. There was consensus that β-carotene is a safe source of vitamin A and that the provitamin A function of β-carotene contributes to vitamin A intake.
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Affiliation(s)
- Tilman Grune
- Institute of Biological Chemistry and Nutrition, University of Hohenheim, Stuttgart 70593, Germany
| | - Georg Lietz
- School of Agriculture, Food and Rural Development, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
| | - Andreu Palou
- Universidad de las Islas Baleares and CIBER de Fisiopatología de la Obesidad y Nutrición, Palma de Mallorca 07112, Spain
| | - A. Catharine Ross
- Department of Nutritional Sciences, Pennsylvania State University, University Park, PA 16802
| | - Wilhelm Stahl
- Institute of Biochemistry and Molecular Biology I, Heinrich Heine University, Düsseldorf 40001, Germany
| | - Guangweng Tang
- USDA Human Nutrition Research Center on Aging, Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111
| | - David Thurnham
- Northern Ireland Centre for Food and Health, University of Ulster, Coleraine BT51 4LA, Co. Londonderry, UK
| | - Shi-an Yin
- National Institute for Nutrition and Food Safety, Chinese Centre for Disease Control and Prevention, Bejing, 100050 China
| | - Hans K. Biesalski
- Institute of Biological Chemistry and Nutrition, University of Hohenheim, Stuttgart 70593, Germany
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Dugo P, Giuffrida D, Herrero M, Donato P, Mondello L. Epoxycarotenoids esters analysis in intact orange juices using two-dimensional comprehensive liquid chromatography. J Sep Sci 2009; 32:973-80. [PMID: 19266547 DOI: 10.1002/jssc.200800696] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In this work, the native carotenoid pattern of different orange juices was studied by LC x LC-DAD/APCI-IT-TOF-MS for the first time. Special attention was given to the epoxycarotenoids components. It has been already proposed that the relative proportions and composition of these epoxycarotenoids can be used to estimate the age and freshness of an orange juice. Re-arrangements from 5,6- to 5,8-epoxides can occur with time, partially due to the natural acidity of the juices. Thus, the study of these carotenoids in their intact form, that is, esterified with fatty acids, is of great interest. Besides, other free carotenoid and carotenoids esters were identified in seven different monovarietal orange juices and a commercial orange juice. Moreover, the higher separation power of the present LC x LC approach allowed a clearer identification of the compounds contained in the sample compared to the more commonly used approach which uses C(30) stationary phases in conventional LC, thanks to the attainment of clearer MS spectra due to the higher resolution and separation degree obtained in LC x LC. This method could also be used to establish authenticity markers among orange varieties that could be potentially used to prevent or detect adulterations or to establish ripeness indexes.
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Affiliation(s)
- Paola Dugo
- Dipartimento di Scienze degli Alimenti e dell'Ambiente, Facoltà di Scienze, Messina, Italy
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Dugo P, Herrero M, Giuffrida D, Ragonese C, Dugo G, Mondello L. Analysis of native carotenoid composition in orange juice using C30columns in tandem. J Sep Sci 2008; 31:2151-60. [DOI: 10.1002/jssc.200800073] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Dugo P, Herrero M, Kumm T, Giuffrida D, Dugo G, Mondello L. Comprehensive normal-phase×reversed-phase liquid chromatography coupled to photodiode array and mass spectrometry detection for the analysis of free carotenoids and carotenoid esters from mandarin. J Chromatogr A 2008; 1189:196-206. [DOI: 10.1016/j.chroma.2007.11.116] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 10/15/2007] [Accepted: 11/20/2007] [Indexed: 11/25/2022]
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Herrero-Martínez JM, Eeltink S, Schoenmakers PJ, Kok WT, Ramis-Ramos G. Determination of major carotenoids in vegetables by capillary electrochromatography. J Sep Sci 2007; 29:660-5. [PMID: 16605085 DOI: 10.1002/jssc.200500427] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A simple and rapid method for the isocratic separation and determination of carotenoids (carotenes and xanthophylls) in vegetables by CEC is described. The capillary column (100 microm ID, 25 cm effective length) was packed with 3 microm Hypersil ODS particles. The optimized mobile phase contained 60% ACN, 35% THF and 5% of a 5 mM Tris aqueous buffer of pH 8. beta-Carotene, lycopene and lutein were separated with efficiencies of 66 000-128 000 plates/m within a short time (less than 12 min for the last peak eluted, 13/13'-cis-beta-carotene). An excellent resolution of the three carotenoids, as well as partial resolution of their geometrical isomers, was achieved. Application to the determination of the analytes in carrot, tomato, spinach and corn was demonstrated.
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Haghighi B, Feizy J, Kakhki AH. LC Determination of Adulterated Saffron Prepared by Adding Styles Colored with Some Natural Colorants. Chromatographia 2007. [DOI: 10.1365/s10337-007-0321-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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16
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Kale AV, Cheryan M. Rapid Analysis of Xanthophylls in Ethanol Extracts of Corn by HPLC. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070601128469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Aniket V. Kale
- a Agricultural Bioprocess Laboratory , University of Illinois , Urbana, Illinois, USA
| | - Munir Cheryan
- a Agricultural Bioprocess Laboratory , University of Illinois , Urbana, Illinois, USA
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18
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Hu P, Zhang M, Napoli JL. Ontogeny of rdh9 (Crad3) expression: ablation causes changes in retinoid and steroid metabolizing enzymes, but RXR and androgen signaling seem normal. Biochim Biophys Acta Gen Subj 2006; 1770:694-705. [PMID: 17270348 PMCID: PMC1847623 DOI: 10.1016/j.bbagen.2006.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2006] [Revised: 12/12/2006] [Accepted: 12/13/2006] [Indexed: 11/30/2022]
Abstract
Crad3 (cis-retinol/androgen dehydrogenase 3), a short-chain dehydrogenase/reductase, converts 9-cis-retinol into 9-cis-retinal and 3alpha-androstanediol into dihydrotestosterone. Crad3 may serve in biosynthesis of 9-cis-retinoic acid, a putative RXR ligand, and/or regeneration of potent androgens. RT-PCR showed that expression of the gene that encodes Crad3, rdh9, begins in liver by e11.5, and in kidney, testis, brain and intestine during e15.5-e16.5. In situ hybridization showed rdh9 expression in embryonic liver, ganglia, small intestine, lung, skin and vertebral cartilage. In adult, in situ hybridization revealed rdh9 expression intensely in hepatocytes, weakly in kidney glomerulus, and intensely in collecting tubules. In intestine, undifferentiated epithelia had greater expression than differentiated epithelia at the distal villus end. Testes expressed rdh9 in spermatogonia, and weakly in Leydig cells. Adult brain expressed rdh9 in the dentate gyrus and CA regions of the hippocampus, the cerebellum Purkinje cells, and the glomerular and mitral cell layers of the olfactory bulb. Rdh9-null mice, backcrossed against C57BL/6J mice, were born in Mendelian frequency, were healthy and fertile, and had normal tissue retinoid and serum dihydrotestosterone levels. Expression of rdh1, a gene that encodes an efficient retinol dehydrogenase, decreased 3- to 8-fold in rdh9-null mice, depending on dietary vitamin A. Microarray analysis and quantitative PCR revealed 2- to 4-fold increases in mRNA of enzymes that catalyze xenobiotic and steroid metabolism, including Cyp2, Cyp3, 11beta-hydroxysteroid dehydrogenase type 2, and 17beta-hydroxsteroid dehydrogenases types 4 and 5. These data indicate widespread Crad3 function(s) in steroid and/or retinoid metabolism starting mid embryogenesis.
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Affiliation(s)
| | | | - Joseph L. Napoli
- Address reprint requests to: Joseph L. Napoli, 119 Morgan Hall, MC#3104, University of California, Berkeley, CA 94720, Phone: 510-642-5202, FAX: 510-642-0535,
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Carroll MJ, Berenbaum MR. Lutein sequestration and furanocoumarin metabolism in parsnip webworms under different ultraviolet light regimes in the montane west. J Chem Ecol 2006; 32:277-305. [PMID: 16555136 DOI: 10.1007/s10886-005-9002-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2003] [Revised: 10/12/2005] [Accepted: 10/24/2005] [Indexed: 10/24/2022]
Abstract
Both biotic and abiotic selection pressures can contribute to geographic variation in allelochemical production in plants. We examined furanocoumarin production in western North American populations of Heracleum lanatum and Pastinaca sativa that, at different latitudes and altitudes, experience different ultraviolet (UV) light regimes. Total furanocoumarins and linear furanocoumarins of fruits were negatively correlated with UV irradiance, whereas amounts of angular furanocoumarins, which are generally less phototoxic, were not. Another factor potentially influencing furanocoumarin production is the presence of the parsnip webworm Depressaria pastinacella, (Lepidoptera: Oecophoridae), an herbivore that feeds on reproductive structures of both plant species. These insects sequester lutein from their host plants; this carotenoid acts to ameliorate furanocoumarin toxicity. Although the concentration of lutein in fruits did not vary with UV irradiance, lutein sequestration by sixth instars was positively correlated with UV irradiance. Webworm populations are variably infested with the polyembryonic webworm parasitoid Copidosoma sosares Walker (Hymenoptera: Encyrtidae). H. lanatum fruits from populations with webworms parasitized by C. sosares had lower concentrations of furanocoumarins, with the exception of sphondin, than fruits from plants infested with webworms free from parasitism. Lower levels of these furanocoumarins may reduce negative effects on the fitness of this parasitoid. In contrast with the variation in furanocoumarin content, the ability of webworms to metabolize furanocoumarins by cytochrome P450 did not differ significantly among populations from New Mexico to Alberta.
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Affiliation(s)
- Mark J Carroll
- Center for Medical, Agricultural, and Veterinary Entomology, USDA/ARS/SAA, 1600/1700 SW 16th Drive, Gainesville, FL 32604, USA
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Lippa KA, Sander LC, Mountain RD. Molecular Dynamics Simulations of Alkylsilane Stationary-Phase Order and Disorder. 1. Effects of Surface Coverage and Bonding Chemistry. Anal Chem 2005; 77:7852-61. [PMID: 16351130 DOI: 10.1021/ac0510843] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
"Shape-selective" polymeric alkylsilane stationary phases are routinely employed over the more common monomeric phases in reversed-phase liquid chromatography (RPLC) to improve the separation of geometric isomers of shape-constrained solutes. We have investigated the molecular dynamics of chromatographic models that represent both monomeric and polymeric stationary phases with alkylsilane surface coverages and bonding chemistries typical of actual materials in an effort to elucidate the molecular-level structural features that control shape-selective separations. The structural characterization of these models is consistent with previous experimental observations of alkyl chain order and disorder: (1) alkyl chain order increases with increased surface coverage; and (2) monomeric and polymeric phases with similar surface coverages yield similar alkyl chain order (although subtle differences exist). In addition, a significant portion of the alkyl chain proximal to the silica surface is disordered (primarily gauche conformations) and the distal end is most ordered. Models that represent shape-selective RPLC phases possess a significant region of distal end chain order with primarily trans dihedral angle conformations. This is consistent with the view that the alkyl chains comprising polymeric stationary phases contain a series of well-defined and rigid voids in which shape-constrained solutes can penetrate and hence be selectively retained.
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Affiliation(s)
- Katrice A Lippa
- Analytical Chemistry Division and Physical and Chemical Properties Division, Chemical Sciences and Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
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21
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Lippa KA, Sander LC, Mountain RD. Molecular Dynamics Simulations of Alkylsilane Stationary-Phase Order and Disorder. 2. Effects of Temperature and Chain Length. Anal Chem 2005; 77:7862-71. [PMID: 16351131 DOI: 10.1021/ac051085v] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In an effort to elucidate the molecular-level structural features that control shape-selective separations, we have investigated the molecular dynamics of chromatographic models that represent both monomeric and polymeric stationary phases with alkylsilane length and temperature conditions analogous to actual materials of low to high shape selectivity. The structural characterization of these models is consistent with previous experimental observations of alkyl chain order and disorder: alkyl chain order increases both with alkyl chain length and with reduced temperature. Models that represent shape-selective reversed-phase liquid chromatography (RPLC) phases possess a significant region of distal end chain order with primarily trans dihedral angle conformations; the extension of these ordered regions into the phase increases with an increase in chain length. Models with extended chain length (C30) possess a higher degree of conformational order and are relatively insensitive to changes in surface coverage, bonding chemistry, and temperature. Chromatography models of various chain lengths and over a temperature range that represents highly shape-selective RPLC stationary phases all contain a series of well-defined and rigid cavities; the size and depth of these "slots" increase for the C30 models, which may promote the enhanced separations of larger size shape-constrained solutes, such as carotenoids.
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Affiliation(s)
- Katrice A Lippa
- Analytical Chemistry Division and Physical and Chemical Properties Division, Chemical Sciences and Technology Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.
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22
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Ishida BK, Ma J, Chan B. A simple, rapid method for HPLC analysis of lycopene isomers. PHYTOCHEMICAL ANALYSIS : PCA 2001; 12:194-198. [PMID: 11705025 DOI: 10.1002/pca.576] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A rapid method for the extraction, separation and quantification of the geometric isomers of lycopene and beta-carotene from tomato fruit is described. Carotenoids in tomato were separated and eluted using a reversed-phase HPLC with a C30 column and a mobile phase consisting of methyl-t-butyl ether, methanol and ethyl acetate. The system provided sharp resolution of cis- and trans-isomers of lycopene within approximately 23 min in contrast to the longer and more complex gradient procedures required by previously described methods. Experiments indicate that the stability of extracts of fresh tomato may be improved if stored at -20 degrees C, and that the presence of the antioxidant BHA has no apparent effect on stability.
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Affiliation(s)
- B K Ishida
- Western Regional Research Center, US Department of Agriculture, Agricultural Research Service, 800 Buchanan Street, Albany, CA 94710, USA.
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23
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Abstract
In recent years, there has been particular emphasis on obtaining more accurate data on the types and concentrations of carotenoids in foods for various health and nutrition activities. The analysis of carotenoids is complicated because of the diversity and the presence of cis-trans isomeric forms of this group of compounds. In addition, a wide variety of food products of vegetal and animal origin, vegetables and animal samples contain carotenoids, and a great range of carotenoids can be found in these samples. The characteristic conjugated double bond system of carotenoids produces the main problem associated with work and manipulation on carotenoids, that is their particular instability, especially towards light, heat, oxygen and acids. For this reason, several precautions are necessary when handling carotenoids. Another problem associated with analysis of carotenoids is the difficulty in obtaining standard compounds. High-performance liquid chromatographic methods for the determination of carotenoids in foods are reviewed. The sample extraction and treatment, carotenoid purification and standard manipulation are briefly commented on. We present a critical assessment of chromatographic methods developed for the determination of carotenoids in foods. Finally, some methods for carotenoid ester separation are reviewed.
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Affiliation(s)
- J Oliver
- Departament de Biologia Fonamental i Ciències de la Salut, Universitat de les Illes Balears, Palma de Mallorca, Spain.
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24
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Su J, Chai X, Kahn B, Napoli JL. cDNA cloning, tissue distribution, and substrate characteristics of a cis-Retinol/3alpha-hydroxysterol short-chain dehydrogenase isozyme. J Biol Chem 1998; 273:17910-6. [PMID: 9651397 DOI: 10.1074/jbc.273.28.17910] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We report here a mouse cDNA that encodes a 316-amino acid short-chain dehydrogenase that prefers NAD+ as its cofactor and recognizes as substrates androgens and retinols, i.e. has steroid 3alpha- and 17beta-dehydrogenase and cis/trans-retinol catalytic activities. This cis-retinol/androgen dehydrogenase type 2 (CRAD2) shares close amino acid similarity with mouse retinol dehydrogenase isozyme types 1 and 2 and CRAD1 (86, 84, and 87%, respectively). CRAD2 exhibits cooperative kinetics with 3alpha-adiol (3alpha-hydroxysteroid dehydrogenase activity) and testosterone (17beta-hydroxysteroid dehydrogenase activity), but Michaelis-Menten kinetics with androsterone (3alpha-hydroxysteroid dehydrogenase activity), 11-cis-retinol, all-trans-retinol, and 9-cis-retinol, with V/K0.5 values of 1.6, 0.2, 0.1, 0.04, 0.005, and not saturated, respectively. Carbenoxolone (IC50 = 2 microM) and 4-methylpyrazole (IC50 = 5 mM) inhibited CRAD2, but neither ethanol nor phosphatidylcholine had marked effects on its activity. Liver expressed CRAD2 mRNA intensely, with expression in lung, eye, kidney, and brain (2.9, 2, 1.6, and 0.6% of liver mRNA, respectively). CRAD2 represents the fifth isozyme in a group of short-chain dehydrogenase/reductase isozymes (retinol dehydrogenases 1-3 and CRAD1), closely related in primary amino acid sequence (approximately 85%), that are expressed in different quantities in various tissues, have different substrate specificities, and may serve different physiological functions. CRAD2 may alter the amounts of active and inactive androgens and/or convert retinols into retinals. These data expand insight into the multifunctional nature of short-chain dehydrogenases/reductases and into the enzymology of steroid and retinoid metabolism.
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Affiliation(s)
- J Su
- Department of Biochemistry, School of Medicine and Biomedical Sciences, State University of New York, Buffalo, New York 14214, USA
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26
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Henry LK, Catignani GL, Schwartz SJ. Oxidative degradation kinetics of lycopene, lutein, and 9-cis
and all-trans
β-carotene. J AM OIL CHEM SOC 1998. [DOI: 10.1007/s11746-998-0232-3] [Citation(s) in RCA: 152] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- L. K. Henry
- ; Department of Food Science; North Carolina State University; Raleigh North Carolina 27695-7624
| | - G. L. Catignani
- ; Department of Food Science; North Carolina State University; Raleigh North Carolina 27695-7624
| | - S. J. Schwartz
- ; Department of Food Science and Technology; The Ohio State University; Columbus Ohio 43210-1097
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27
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Pinheiro Sant’Ana HM, Stringheta PC, Cardoso Brandão SC, Cordeiro de Azeredo RM. Carotenoid retention and vitamin A value in carrot (Daucus carota L.) prepared by food service. Food Chem 1998. [DOI: 10.1016/s0308-8146(97)00084-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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28
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Chai X, Zhai Y, Napoli JL. cDNA cloning and characterization of a cis-retinol/3alpha-hydroxysterol short-chain dehydrogenase. J Biol Chem 1997; 272:33125-31. [PMID: 9407098 DOI: 10.1074/jbc.272.52.33125] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
We report a mouse cDNA that encodes a 317-amino acid short-chain dehydrogenase which recognizes as substrates 9-cis-retinol, 11-cis-retinol, 5alpha-androstan-3alpha,17beta-diol, and 5alpha-androstan-3alpha-ol-17-one. This cis-retinol/androgen dehydrogenase (CRAD) shares closest amino acid similarity with mouse retinol dehydrogenase isozymes types 1 and 2 (86 and 91%, respectively). Recombinant CRAD uses NAD+ as its preferred cofactor and exhibits cooperative kinetics for cis-retinoids, but Michaelis-Menten kinetics for 3alpha-hydroxysterols. Unlike recombinant retinol dehydrogenase isozymes, recombinant CRAD was inhibited by 4-methylpyrazole, was not stimulated by ethanol, and did not require phosphatidylcholine for optimal activity. CRAD mRNA was expressed intensely in kidney and liver, in contrast to retinol dehydrogenase isozymes, which show strong mRNA expression only in liver. CRAD mRNA expression was widespread (relative abundance): kidney (100) > liver (92) > small intestine (9) = heart (9) > retinal pigment epithelium and sclera (4.5) > brain (2) > retina and vitreous (1.6) > spleen (0.7) > testis (0.6) > lung (0.4). CRAD may catalyze the first step in an enzymatic pathway from 9-cis-retinol to generate the retinoid X receptor ligand 9-cis-retinoic acid and/or may regenerate dihydrotestosterone from its catabolite 5alpha-androstan-3alpha,17beta-diol. These data also illustrate the multifunctional nature of short-chain dehydrogenases and provide a potential mechanism for androgen-retinoid interactions.
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Affiliation(s)
- X Chai
- Department of Biochemistry, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, New York 14214, USA
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29
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Po ES, Ho JW, Gong BY. Simultaneous chromatographic analysis of eight fat-soluble vitamins in plasma. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1997; 34:99-106. [PMID: 9178086 DOI: 10.1016/s0165-022x(97)01210-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A high-performance liquid chromatographic (HPLC) method for the simultaneous analysis of eight fat-soluble vitamins including A acid, retinol and retinal, vitamins D2 and D3 together with menadione (vitamin K3) is described. The eight vitamins extracted from plasma were analyzed by reversed-phase HPLC with UV detection at 245 nm. The mobile phase was composed of methanol and ethanol (85:15, v/v) with 0.1% triethylamine. The extraction efficiency of different solvents, namely, dichloromethane, benzene, methanol, ethanol, chloroform and hexane, with or without the addition of detergents was studied. There is no single solvent system that could extract all eight vitamins in one step. A recovery study of the vitamins was performed using rabbit plasma. An average recovery for individual vitamins was about 40% or more with the described extraction methods. The absorbance response was linear at the nanogram level. The present method may be broadly applied with alternative extraction methods for the eight vitamins from different sources.
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Affiliation(s)
- E S Po
- Department of Biochemistry, Chinese University of Hong Kong, Shatin, Hong Kong
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30
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Strohschein S, Schlotterbeck G, Richter J, Pursch M, Tseng LH, Händel H, Albert K. Comparison of the separation of cis/trans isomers of tretinoin with different stationary phases by liquid chromatography-nuclear magnetic resonance coupling. J Chromatogr A 1997. [DOI: 10.1016/s0021-9673(96)00946-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Gao G, Wei CC, Jeevarajan AS, Kispert LD. Geometrical Isomerization of Carotenoids Mediated by Cation Radical/Dication Formation. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9529230] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Emenhiser C, Sander LC, Schwartz SJ. Capability of a polymeric C30 stationary phase to resolve cis-trans carotenoid isomers in reversed-phase liquid chromatography. J Chromatogr A 1995. [DOI: 10.1016/0021-9673(95)00336-l] [Citation(s) in RCA: 147] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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33
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Tarantilis PA, Tsoupras G, Polissiou M. Determination of saffron (Crocus sativus L.) components in crude plant extract using high-performance liquid chromatography-UV-visible photodiode-array detection-mass spectrometry. J Chromatogr A 1995; 699:107-18. [PMID: 7757208 DOI: 10.1016/0021-9673(95)00044-n] [Citation(s) in RCA: 195] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The determination of saffron components in crude plant extracts by high-performance liquid chromatography-UV-visible photodiode-array detection on-line with mass spectrometry is described. The method is shown to be suitable for the determination of picrocrocin, the glycosidic precursor of safranal, safranal and flavonoids; it is the technique of choice for the analysis of crocetin glycosides (crocins) carrying one up to five glucoses and differentiation of their trans and cis isomers.
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Affiliation(s)
- P A Tarantilis
- Department of General Sciences, Agricultural University of Athens, Greece
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34
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35
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Gennaro MC, Abrigo C, Cipolla G. High-performance liquid chromatography of food colours and its relevance in forensic chemistry. J Chromatogr A 1994; 674:281-99. [PMID: 8075774 DOI: 10.1016/0021-9673(94)85234-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The forensic interest in the use of food colours is related to health rights and safeguard of the consumer, as established in national legislations. The regulations related to food dyes consider the health of human beings and the adulteration of foodstuffs and economic needs connected with quantitative restrictions on imports. Efficient analytical methods are required for evaluating toxicity and authenticity or adulteration, in order (a) to determine whether there are synthetic dyes present in foods and whether they are permitted, (b) to determine the levels, (c) to confirm the absence of added dyes in foods where they are not declared and (d) to check on the stability of dyes during processing and storage. Recent HPLC methods for the identification and determination of natural and synthetic dyes and of carcinogenic amines contained as impurities in synthetic dyes are reviewed.
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Affiliation(s)
- M C Gennaro
- Dipartimento di Chimica Analitica, Università di Torino, Turin, Italy
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36
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Tarantilis PA, Polissiou M, Manfait M. Separation of picrocrocin, cis-trans-crocins and safranal of saffron using high-performance liquid chromatography with photodiode-array detection. J Chromatogr A 1994; 664:55-61. [PMID: 8012549 DOI: 10.1016/0021-9673(94)80628-4] [Citation(s) in RCA: 119] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
High-performance liquid chromatography with photodiode-array detection was used to separate picrocrocin (bitter-tasting component, glucoside of safranal), cis/trans-crocins (carotenoids, glucosyl esters of crocetin) and safranal (flavour, monoterpene aldehyde) of saffron. All components of pure red Greek saffron were extracted from dried stigma with 50% methanol. These compounds were detected, separated collected and identified simultaneously using a Merck LiChroCART 125-4 Superspher 100 RP-18 (4 microns) column and as mobile phase a linear gradient from 20% to 100% acetonitrile in water in 20 min with a detection wavelength at 308 nm.
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Affiliation(s)
- P A Tarantilis
- Department of General Sciences, Agricultural University of Athens, Greece
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37
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Fraser PD, Albrecht M, Sandmann G. Development of high-performance liquid chromatographic systems for the separation of radiolabelled carotenes and precursors formed in specific enzymatic reactions. J Chromatogr A 1993. [DOI: 10.1016/0021-9673(93)83386-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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