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Du H, Li T, Xue Q, Tian Y, Hu Y. Optimization and validation of folate extraction from Moringa oleifera leaves powder. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2023. [DOI: 10.1007/s11694-023-01876-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
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2
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Agyenim-Boateng KG, Zhang S, Islam MS, Gu Y, Li B, Azam M, Abdelghany AM, Qi J, Ghosh S, Shaibu AS, Gebregziabher BS, Feng Y, Li J, Li Y, Zhang C, Qiu L, Liu Z, Liang Q, Sun J. Profiling of naturally occurring folates in a diverse soybean germplasm by HPLC-MS/MS. Food Chem 2022; 384:132520. [PMID: 35217465 DOI: 10.1016/j.foodchem.2022.132520] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/27/2022] [Accepted: 02/17/2022] [Indexed: 11/04/2022]
Abstract
Soybean is a rich source of folates. We optimised the extraction and detection of folates from soybean seeds by HPLC-MS/MS and analysed the folate content and composition of 1074 accessions. Total folate content ranged from 64.51 to 691.24 μg/100 g fresh weight, with 10-fold variation, and 60 elite accessions with over 400 μg/100 g of total folate were identified. The most abundant component was 5-CHO-H4folate, which accounted for an average of 60% of total folate content. Seed-coat colour, seed weight, ecoregion, and accession type significantly affected soybean folate content. Furthermore, 5-CH3-H4folate correlated positively with seed protein (r = 0.24***) and negatively with oil (r = -0.26***). The geographical distribution of folate according to accession origin revealed that accessions from Northeast China contain higher amounts of total folate and 5-CHO-H4folate. This study provides comprehensive and novel insights into the folate profile of soybean, which will benefit soybean breeding for folate enhancement.
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Affiliation(s)
- Kwadwo Gyapong Agyenim-Boateng
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Shengrui Zhang
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Md Shariful Islam
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yongzhe Gu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Germplasm and Biotechnology (MARA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Bin Li
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Muhammad Azam
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Ahmed M Abdelghany
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Crop Science Department, Faculty of Agriculture, Damanhour University, Damanhour 22516, Egypt
| | - Jie Qi
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Suprio Ghosh
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Bangladesh Agricultural Research Institute, Gazipur 1701, Bangladesh
| | - Abdulwahab S Shaibu
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Department of Agronomy, Bayero University, Kano 700001, Nigeria
| | - Berhane Sibhatu Gebregziabher
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China; Crop Sciences Research Department, Mehoni Agricultural Research Center, Maichew 7020, Ethiopia
| | - Yue Feng
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jing Li
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yinghui Li
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Germplasm and Biotechnology (MARA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Chunyi Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Lijuan Qiu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Germplasm and Biotechnology (MARA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Zhangxiong Liu
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Laboratory of Germplasm and Biotechnology (MARA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Qiuju Liang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Junming Sun
- The National Engineering Research Center of Crop Molecular Breeding, MARA Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
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Zan K, Hu X, Li Y, Wang Y, Jin H, Zuo T, Ma S. Simultaneous determination of eight pyrrolizidine alkaloids in various parts of Eupatorium lindleyanum by ultra high performance liquid chromatography tandem mass spectrometry and risk assessments based on a real-life exposure scenario. J Sep Sci 2021; 44:3237-3247. [PMID: 34240803 DOI: 10.1002/jssc.202100286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 07/05/2021] [Accepted: 07/06/2021] [Indexed: 02/02/2023]
Abstract
Pyrrolizidine alkaloids are toxins having hepatotoxic and carcinogenic effects on human health. A ultra high performance liquid chromatography tandem mass spectrometry technique was developed for the first time for the simultaneous determination of eight pyrrolizidine alkaloids, including four diastereoisomers (intermedine, lycopsamine, rinderine, and echinatine) and their respective N-oxide forms, in different parts of Eupatorium lindleyanum. The risk assessment method for pyrrolizidine alkaloids in Eupatorium lindleyanum was explored using the margin of exposure strategy for the first time based on a real-life exposure scenario. Differences were found in all eight pyrrolizidine alkaloids in various parts of Eupatorium lindleyanum. Besides, the total levels of pyrrolizidine alkaloids in Eupatorium lindleyanum followed the order of root > flower > stem > leaf. Moreover, the risk assessment data revealed that the deleterious effects on human health were unlikely at exposure times of less than 200, 37, and 12 days during the lifetimes of Eupatorium lindleyanum leaves, stems, and flowers, respectively. This study reported both the contents of and risk associated with Eupatorium lindleyanum pyrrolizidine alkaloids. The comprehensive application of the novel ultra high performance liquid chromatography tandem mass spectrometry technique alongside the risk assessment approach provided a scientific basis for quality evaluation and rational utilization of toxic pyrrolizidine alkaloids in Eupatorium lindleyanum to improve public health safety.
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Affiliation(s)
- Ke Zan
- National Institutes for Food and Drug Control, Beijing, 102629, P. R. China
| | - Xiaowen Hu
- National Institutes for Food and Drug Control, Beijing, 102629, P. R. China
| | - Yaolei Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, 102488, P. R. China
| | - Ying Wang
- National Institutes for Food and Drug Control, Beijing, 102629, P. R. China
| | - Hongyu Jin
- National Institutes for Food and Drug Control, Beijing, 102629, P. R. China
| | - Tiantian Zuo
- National Institutes for Food and Drug Control, Beijing, 102629, P. R. China
| | - Shuangcheng Ma
- National Institutes for Food and Drug Control, Beijing, 102629, P. R. China
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Islam MS, Mehmood S, Zhang C, Liang Q. Identification of the prepared foods promising for dietary folate intake in Beijing, China. Food Sci Nutr 2020; 8:6557-6567. [PMID: 33312540 PMCID: PMC7723199 DOI: 10.1002/fsn3.1945] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/22/2020] [Accepted: 09/26/2020] [Indexed: 11/09/2022] Open
Abstract
The aim of the present study was to analyze folate content and composition in foods consumed daily by Chinese people. The concentration of seven folate derivatives in sixty-four selected foods was determined by a liquid-chromatography tandem-mass spectrometry method. The total folate levels ranged from 0.28 to 129 µg/100 g fresh weight, with an average of 21.18 μg/100 g. The highest folate content was found in boiled egg yolk and waxy corn (>120 µg/100 g), abundant folate levels in cooked vegetables such as hot pepper, spinach, soybean sprout, stem lettuce, coriander, and broccoli (44-72 µg/100 g), and lowest in Coca Cola (0.28 µg/100 g). 5-Methyl-tetrahydrofolate was the major folate derivative in various foods, accounting for 72% of the total folates on average, with the highest being 90% in egg yolk. These data will enable estimation of the daily folate intake and allow dietary recommendations to improve folate status in humans.
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Affiliation(s)
- Md Shariful Islam
- Biotechnology Research InstituteChinese Academy of Agricultural SciencesBeijingChina
| | - Shahid Mehmood
- Biotechnology Research InstituteChinese Academy of Agricultural SciencesBeijingChina
| | - Chunyi Zhang
- Biotechnology Research InstituteChinese Academy of Agricultural SciencesBeijingChina
| | - Qiuju Liang
- Biotechnology Research InstituteChinese Academy of Agricultural SciencesBeijingChina
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Shohag MJI, Wei Y, Zhang J, Feng Y, Rychlik M, He Z, Yang X. Genetic and physiological regulation of folate in pak choi (Brassica rapa subsp. Chinensis) germplasm. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:4914-4929. [PMID: 32639001 PMCID: PMC7410185 DOI: 10.1093/jxb/eraa218] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 07/07/2020] [Indexed: 05/21/2023]
Abstract
Folates are one of the essential micronutrients for all living organisms. Due to inadequate dietary intake, folate deficiency remains prevalent in humans. Genetically diverse germplasms can potentially be used as parents in breeding programs and also for understanding the folate regulatory network. Therefore, we investigated the natural genetic diversity of folates and their physiological regulation in pak choi (Brassica rapa subsp. Chinensis) germplasm. The total folate concentration ranged from 52.7 μg 100 gFW-1 to 166.9 μg 100 gFW-1, with 3.2-fold variation. The main folate vitamer was represented by 5-CH3-H4folate, with 4.5-fold variation. The activities of GTP cyclohydrolase I and aminodeoxy chorismate synthase, the first step of folate synthesis, were high in high folate accessions and low in low folate accessions. Analysis of the transcription levels of 11 genes associated with folate metabolism demonstrated that the difference in folate concentrations may be primarily controlled at the post-transcriptional level. A general correlation between total folate and their precursors was observed. Folate diversity and chlorophyll content were tightly regulated through the methyl cycle. The diverse genetic variation in pak choi germplasm indicated the great genetic potential to integrate breeding programs for folate biofortification and unravel the physiological basis of folate homeostasis in planta.
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Affiliation(s)
- M J I Shohag
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, China
- Department of Agriculture, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, Bangladesh
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL, USA
| | - Yanyan Wei
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, China
- Cultivation Base of Guangxi Key Laboratory for Agro-Environment and Agro-Products Safety, College of Agriculture, Guangxi University, Nanning, China
| | - Jie Zhang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, China
- International Research Center for Environmental Membrane Biology, Department of Horticulture, Foshan University, Guangdong, China
| | - Ying Feng
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, China
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technische Universitat Munchen, Lise-Meitner-Str. 34, Freising, Germany
| | - Zhenli He
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, China
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL, USA
| | - Xiaoe Yang
- Ministry of Education (MOE) Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Hangzhou, China
- Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL, USA
- Correspondence:
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Folate monoglutamate in cereal grains: Evaluation of extraction techniques and determination by LC-MS/MS. J Food Compost Anal 2020. [DOI: 10.1016/j.jfca.2020.103510] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Gmelch L, Wirtz D, Witting M, Weber N, Striegel L, Schmitt-Kopplin P, Rychlik M. Comprehensive Vitamer Profiling of Folate Mono- and Polyglutamates in Baker's Yeast ( Saccharomyces cerevisiae) as a Function of Different Sample Preparation Procedures. Metabolites 2020; 10:E301. [PMID: 32717862 PMCID: PMC7464241 DOI: 10.3390/metabo10080301] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 07/13/2020] [Accepted: 07/16/2020] [Indexed: 11/22/2022] Open
Abstract
Folates are a group of B9 vitamins playing an important role in many metabolic processes such as methylation reactions, nucleotide synthesis or oxidation and reduction processes. However, humans are not able to synthesize folates de novo and thus rely on external sources thereof. Baker's yeast (Saccharomyces cerevisiae) has been shown to produce high amounts of this vitamin but extensive identification of its folate metabolism is still lacking. Therefore, we optimized and compared different sample preparation and purification procedures applying solid phase extraction (SPE). Strong anion exchange (SAX), C18 and hydrophilic-lipophilic-balanced (HLB) materials were tested for their applicability in future metabolomics studies. SAX turned out to be the preferred material for the quantitative purification of folates. Qualification of several folate vitamers was achieved by ultra-high pressure liquid chromatography quadrupole time of flight mass spectrometry (UHPLC-Q-ToF-MS) measurements and quantification was performed by liquid chromatography tandem mass spectrometry (LC-MS/MS) applying stable isotope dilution assays (SIDAs). The oxidation product s-pyrazino-triazine (MeFox) was included into the SIDA method for total folate determination and validation. Applying the best protocol (SAX) in regard to folate recovery, we analyzed 32 different vitamers in different polyglutamate states up to nonaglutamates, of which we could further identify 26 vitamers based on tandem-MS (MS2) spectra. Total folate quantification revealed differences in formyl folate contents depending on the cartridge chemistry used for purification. These are supposedly a result of interconversion reactions occurring during sample preparation due to variation in pH adjustments for the different purification protocols. The occurrence of interconversion and oxidation reactions should be taken into consideration in sample preparation procedures for metabolomics analyses with a focus on folates.
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Affiliation(s)
- Lena Gmelch
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
| | - Daniela Wirtz
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
| | - Michael Witting
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
- Research Unit BioGeoChemistry, Helmholtz Zentrum Munich, 85764 Neuherberg, Germany
| | - Nadine Weber
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
| | - Lisa Striegel
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
| | - Philippe Schmitt-Kopplin
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
- Research Unit BioGeoChemistry, Helmholtz Zentrum Munich, 85764 Neuherberg, Germany
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technical University of Munich, 85354 Freising-Weihenstephan, Germany; (L.G.); (D.W.); (M.W.); (N.W.); (L.S.)
- Research Unit BioGeoChemistry, Helmholtz Zentrum Munich, 85764 Neuherberg, Germany
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Zhang H, Jha AB, De Silva D, Purves RW, Warkentin TD, Vandenberg A. Improved folate monoglutamate extraction and application to folate quantification from wild lentil seeds by ultra-performance liquid chromatography-selective reaction monitoring mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2019; 1121:39-47. [DOI: 10.1016/j.jchromb.2019.05.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2018] [Revised: 04/23/2019] [Accepted: 05/07/2019] [Indexed: 10/26/2022]
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Fatima Z, Jin X, Zou Y, Kaw HY, Quinto M, Li D. Recent trends in analytical methods for water-soluble vitamins. J Chromatogr A 2019; 1606:360245. [PMID: 31122728 DOI: 10.1016/j.chroma.2019.05.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 04/30/2019] [Accepted: 05/13/2019] [Indexed: 12/28/2022]
Abstract
In this review, recent advances in the analysis of water-soluble vitamins (WSVs) have been reported considering the advantages and disadvantages of various extraction, separation and detection techniques, commonly used for their quantification. Acid hydrolysis, enzyme treatment, SPE based methods and some other extraction methods have been discussed. Particular attention has been devoted to the analytical techniques based on liquid chromatography and electrophoresis. Furthermore, suitability and selectivity of hydrophilic interaction liquid chromatography (HILIC) for WSVs has been discussed in detail. Problems related to these techniques and their possible solutions have also been considered. Special focus has been given to the applications of liquid chromatography (since 2014-2019) for the simultaneous analysis of WSVs and their homologous in complex food samples.
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Affiliation(s)
- Zakia Fatima
- Department of Chemistry, MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional Molecules, Yanbian University, Park Road 977, Yanji 133002, Jilin Province, PR China
| | - Xiangzi Jin
- Department of Chemistry, MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional Molecules, Yanbian University, Park Road 977, Yanji 133002, Jilin Province, PR China
| | - Yilin Zou
- Department of Chemistry, MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional Molecules, Yanbian University, Park Road 977, Yanji 133002, Jilin Province, PR China
| | - Han Yeong Kaw
- Department of Chemistry, MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional Molecules, Yanbian University, Park Road 977, Yanji 133002, Jilin Province, PR China
| | - Maurizio Quinto
- Department of Chemistry, MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional Molecules, Yanbian University, Park Road 977, Yanji 133002, Jilin Province, PR China; SAFE - Department of Science of Agriculture, Food and Environment, University of Foggia, via Napoli 25, I-71100 Foggia, Italy
| | - Donghao Li
- Department of Chemistry, MOE Key Laboratory of Natural Resources of the Changbai Mountain and Functional Molecules, Yanbian University, Park Road 977, Yanji 133002, Jilin Province, PR China.
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The use of a plant enzyme for rapid and sensitive analysis of naturally-occurring folates in food by liquid chromatography-tandem mass spectrometry. J Chromatogr A 2019; 1594:34-44. [PMID: 30799066 DOI: 10.1016/j.chroma.2019.02.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 02/12/2019] [Accepted: 02/16/2019] [Indexed: 11/27/2022]
Abstract
A rapid, sensitive and reproducible method for analysis of naturally-occurring folates and folic acid in food has been developed and validated. A single-enzyme extraction step, in which a pure recombinant enzyme of plant origin (Arabidopsis thaliana) was used, enabled fast and reproducible deglutamylation during folate extraction within the incubation time of 1 h. Six commonly occurring folate forms (tetrahydrofolate, 5,10-methenyltetrahydrofolate, 10-formylfolic acid, 5-formyltetrahydrofolate, folic acid and 5-methyltetrahydrofolate) were detected and quantified in 9 min using liquid chromatography-tandem mass spectrometry (LC-MS/MS). 13C5-labeled 5-formyltetrahydrofolate, 13C5-labeled folic acid and 13C5-labeled 5-methyltetrahydrofolate were used as internal standards for the quantification. The method is described by a calibration curve (R2>0.99 and trueness 85-115%), a limit of quantification at 0.1 μg/100 g, trueness at 80-120% in spiked samples and certified reference materials, and a precision <10%. However, the precision in quantification of tetrahydrofolate was not within the acceptable limits due to the lack of use of the corresponding internal standard. An interconversion study of unstable formyl forms was performed which showed that 50% of 5,10-methenyltetrahydrofolate is converted to 5-formyltetrahydrofolate during the analysis. The developed LC-MS/MS method is a candidate for a future standard method for folate analysis in food.
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12
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Folate stability and method optimization for folate extraction from seeds of pulse crops using LC-SRM MS. J Food Compost Anal 2018. [DOI: 10.1016/j.jfca.2018.04.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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