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Son J, Jeong KJ. Engineering of Leuconostoc citreum for Efficient Bioconversion of Soy Isoflavone Glycosides to Their Aglycone Forms. Int J Mol Sci 2022; 23:ijms23179568. [PMID: 36076965 PMCID: PMC9455899 DOI: 10.3390/ijms23179568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/19/2022] [Accepted: 08/22/2022] [Indexed: 11/16/2022] Open
Abstract
Soy isoflavones are phytochemicals that possess various beneficial physiological properties such as anti-aging, anti-tumor, and antioxidant properties. Since soy isoflavones exist in glycoside forms, their bioavailability requires initial hydrolysis of the sugar moieties bound to them to be efficiently absorbed through the gut epithelium. Instead of conventional chemical hydrolysis using acids or organic solvents, alternative strategies for enhancing the bioavailability of soy isoflavones using biological methods are gaining attention. Here, we engineered Leuconostoc citreum isolated from Korean kimchi for efficient bioconversion of soy isoflavone glycosides into their aglycone forms to enhance their bioavailability. We first constructed an expression module based on the isoflavone hydrolase (IH)-encoding gene of Bifidobacterium lactis, which mediates conversion of isoflavone glycosides to aglycone forms. Using a high copy number plasmid and bicistronic expression design, the IH was successfully synthesized in L. citreum. Additionally, we determined enzymatic activity of the IH using an in vivo β-glucosidase assay and confirmed its highly efficient bioconversion efficiency for various types of isoflavone glycosides. Finally, we successfully demonstrated that the engineered L. citreum could convert isoflavone glycosides present in fermented soymilk into aglycones.
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Affiliation(s)
- Jaewoo Son
- Department of Chemical and Biomolecular Engineering, BK21 Plus Program, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
| | - Ki Jun Jeong
- Department of Chemical and Biomolecular Engineering, BK21 Plus Program, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
- Institute for The BioCentury, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
- Correspondence: ; Tel.: +82-42-350-3934
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2
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Yang H, Li T, Cao W. Optimizing pre-treatment of alkaline hydrolysis RP-HPLC for enhancing accuracy of soy isoflavone determination. J Chromatogr B Analyt Technol Biomed Life Sci 2022; 1207:123382. [PMID: 35878432 DOI: 10.1016/j.jchromb.2022.123382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 06/11/2022] [Accepted: 07/18/2022] [Indexed: 11/18/2022]
Abstract
Isoflavones (IFs) are important bioactive compounds which offers several benefits to human health. Despite the importance of IFs content, there are still some deficiencies in the existing methods. The objective of this study is to optimize key parameters of alkaline hydrolysis method for enhancing both reliability and accuracy of quantitative analysis of IFs contents in soybeans and soy protein products. Solvent type, extraction temperature, heating mode, alkaline concentration, hydrolysis temperature, hydrolysis time and some details are key points to target analytes which yield determining parameters. The biggest IFs content was obtained by extraction using methanol (MeOH)/water (80:20, v/v) in a 75 ℃ oven for 2 h, and hydrolyzation with 3 M NaOH solution at a room temperature for 10 mins. The total IFs content obtained by the improved method has increased by 16.4% compared with AOAC Official Method 2001.10. The accuracy of the method was evaluated using the relative standard deviation (RSD). Intraday accuracies in the total amount of isoflavones of four samples were 0.03%-0.63% (n = 3). Interday accuracy in the total amount of isoflavones was 2.71% (n = 6). LOD of IFs ranged from 0.1μg/mL for aglycones to 0.2μg/mL for glucosides. LOQ of IFs ranged from 0.3μg/mL for aglycones to 0.5μg/mL for glucosides. The improved method was proven to be a more accurate way to determine IFs contents in soybeans and soy protein products and thus making it useful for quality control and systematic in-depth study of soybeans and soy products; even to further assess the dietary soy exposure and the soy-health association.
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Affiliation(s)
- Hong Yang
- Wilmar (Shanghai) Biotechnology Research & Development Center Co., Ltd. Shanghai 200137, China
| | - Tong Li
- Wilmar (Shanghai) Biotechnology Research & Development Center Co., Ltd. Shanghai 200137, China
| | - Wenming Cao
- Wilmar (Shanghai) Biotechnology Research & Development Center Co., Ltd. Shanghai 200137, China.
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3
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A UHPLC-PDA method for the quantitative analysis of total amino acids in infant formula with microwave-assisted acid hydrolysis. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02078-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kim DH, Yang WT, Cho KM, Lee JH. Comparative analysis of isoflavone aglycones using microwave-assisted acid hydrolysis from soybean organs at different growth times and screening for their digestive enzyme inhibition and antioxidant properties. Food Chem 2020; 305:125462. [PMID: 31618694 DOI: 10.1016/j.foodchem.2019.125462] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 08/10/2019] [Accepted: 09/03/2019] [Indexed: 12/20/2022]
Abstract
The objectives of this research were to demonstrate the changes in isoflavone-aglycones, total phenolics, and biological properties (digestive enzyme inhibition; antioxidant) from six organs including leaves, leafstalks, roots, stems, seeds, and pods at different growth times of soybean plant. Three isoflavone-aglycones in microwave-assisted acid hydrolysis extracts were elucidated using UHPLC-ESI-Q-TOF-MS/MS and their contents exhibited remarkable differences in leaves (245.93-2239.33 μg/g), roots (854.96-4425.34 μg/g), and seeds (ND-2339.62 μg/g). Specifically, the collected samples on 15-Oct (leaves: 2239.33; seeds: 2339.62 μg/g) and 31-Aug (roots: 4425.34 μg/g) showed the highest isoflavone-aglycones, and daidzein was observed the most abundant component, comprising approximately 70%. Moreover, the inhibitions against α-glucosidase and α-amylase displayed the predominant effects in roots (89;91%) and leaves (81;85%) of samples on 31-Aug and 15-Oct at 300 μg/ml. The antioxidant activities on ABTS, DPPH, and hydroxyl radicals increased considerably with the increases of growth times in leaves and seeds, especially, ABTS showed the highest scavenging abilities: leaves (15-Oct;83%) > roots (31-Aug;75%) > seeds (15-Oct;68%). Therefore, our results suggest that soybean leaves, roots and seeds may be considered as excellent natural sources for nutraceuticals.
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Affiliation(s)
- Du Hyun Kim
- Department of Life Resource Industry, Dong-A University, 37, Nakdong-daero 550 beon-gil, Saha-gu, Busan 49315, Republic of Korea
| | - Won Tae Yang
- Department of Life Resource Industry, Dong-A University, 37, Nakdong-daero 550 beon-gil, Saha-gu, Busan 49315, Republic of Korea
| | - Kye Man Cho
- Department of Food Science, Gyeongnam National University of Science and Technology, Jinju 34111, Republic of Korea.
| | - Jin Hwan Lee
- Department of Life Resource Industry, Dong-A University, 37, Nakdong-daero 550 beon-gil, Saha-gu, Busan 49315, Republic of Korea.
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Görgüç A, Özer P, Yılmaz FM. Microwave‐assisted enzymatic extraction of plant protein with antioxidant compounds from the food waste sesame bran: Comparative optimization study and identification of metabolomics using LC/Q‐TOF/MS. J FOOD PROCESS PRES 2019. [DOI: 10.1111/jfpp.14304] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Ahmet Görgüç
- Engineering Faculty, Food Engineering Department Aydın Adnan Menderes University Efeler Turkey
| | - Pınar Özer
- Engineering Faculty, Food Engineering Department Aydın Adnan Menderes University Efeler Turkey
| | - Fatih Mehmet Yılmaz
- Engineering Faculty, Food Engineering Department Aydın Adnan Menderes University Efeler Turkey
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Zhang H, Yu H. Enhanced biotransformation of soybean isoflavone from glycosides to aglycones using solid-state fermentation of soybean with effective microorganisms (EM) strains. J Food Biochem 2019; 43:e12804. [PMID: 31353590 DOI: 10.1111/jfbc.12804] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 01/04/2019] [Accepted: 01/05/2019] [Indexed: 11/29/2022]
Abstract
To improve the biotransformation efficacy (BE) of glycosides to aglycones in total soybean isoflavone (SIF), Taguchi experimental design has been used to study the most significant factors on BE of glycosides to aglycones using solid-state fermentation (SSF) of soybean with effective microorganisms (EM) strains. Physicochemical properties of optimized fermented dregs have also been analyzed to evaluate their probiotics count and mainly nutritional parameters. The results showed that identified optimal fermentation conditions are 30°C, 40% water content, 5% inoculation level, 6 d culture time, and 20 mesh number. BE of aglycones reached 85.30% with dry matter recoveries of 96.34% based on optimal fermentation conditions. Total bacterial and lactic acid bacteria count reached 17.98 and 9.34 × 108 CFU/g with decreasing pH (4.21) and an increasing acidity (8.62 g/kg), respectively. This study could provide the theoretical grounds for aglycones biotransformation in large-scale production applied in food and other fields. PRACTICAL APPLICATIONS: Isoflavones widely present in soy products possessing strong antioxidant capacity and estrogen-like activity. In human intestines, aglycone isoflavones after treatment/fermented are absorbed faster than their glucosides in untreated soybeans. The majority of glucoside isoflavones in soybean during fermentation were biologically converted to bioactive aglycone isoflavones via EM strains-fermented β-glucosidase. SSF of soybean with EM cocultures to ferment soymilk efficiently increased BE of glycosides to aglycones. Hence, EM cocultures as a new functional ingredient could improve the nutritional value of fermented soybean.
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Affiliation(s)
- Hongcai Zhang
- State Key Laboratory of Dairy Biotechnology, Shanghai Engineering Research Center of Dairy Biotechnology, Dairy Research Institute, Bright Dairy & Food Co., Ltd., Synergetic Innovation Center of Food Safety and Nutrition, Shanghai, China
- Department of Food Science and Technology, Shanghai Ocean University, Shanghai, China
- Laboratory of Aquatic Products Quality & Safety Risk Assessment (Shanghai), China Ministry of Agriculture, Shanghai Ocean University, Shanghai, China
| | - Huaning Yu
- State Key Laboratory of Dairy Biotechnology, Shanghai Engineering Research Center of Dairy Biotechnology, Dairy Research Institute, Bright Dairy & Food Co., Ltd., Synergetic Innovation Center of Food Safety and Nutrition, Shanghai, China
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7
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Central Composite Design-Desirability Function Approach for Optimum Ultrasound-Assisted Extraction of Daidzein and Genistein from Soybean and Their Antimycotoxigenic Potential. FOOD ANAL METHOD 2018. [DOI: 10.1007/s12161-018-1357-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Lee JH, Kim B, Hwang CE, Haque MA, Kim SC, Lee CS, Kang SS, Cho KM, Lee DH. Changes in conjugated linoleic acid and isoflavone contents from fermented soymilks using Lactobacillus plantarum P1201 and screening for their digestive enzyme inhibition and antioxidant properties. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.01.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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9
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Seo WD, Kang JE, Choi SW, Lee KS, Lee MJ, Park KD, Lee JH. Comparison of nutritional components (isoflavone, protein, oil, and fatty acid) and antioxidant properties at the growth stage of different parts of soybean [ Glycine max (L.) Merrill]. Food Sci Biotechnol 2017; 26:339-347. [PMID: 30263548 PMCID: PMC6049444 DOI: 10.1007/s10068-017-0046-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 12/07/2016] [Accepted: 12/14/2016] [Indexed: 10/19/2022] Open
Abstract
This is the first study to investigate antioxidant capacities of isoflavones prepared using microwave-assisted hydrolysis method from different parts (seeds, leaves, leafstalks, pods, stems and roots) of soybean at growth stages. In addition, the fluctuations in the isoflavone, protein, fatty acid, and oil contents in R6-R8 (R6: beginning; R7: beginning maturity; R8: full maturity) seeds were confirmed. The R7 seeds exhibited the most predominant contents of isoflavones (1218.1±7.3 μg/g) in the following order: daidzein (48%)>genistein (35%)>glycitein (17%). The second highest isoflavone content was found in the leaves (1052.1±10.4 μg/g), followed by R8 seeds>roots>R6 seeds>leafstalks> pods; the stems exhibited the lowest isoflavone content (57.2±1.7 μg/g). Interestingly, daidzein showed the highest individual isoflavone content with remarkable variations (57.2-766.8 μg/g), representing 46-100% of the total isoflavone content. R8 exhibited higher protein, fatty acid, and oil contents than R6 or R7. Moreover, the antioxidant capacities against two radicals in different parts of soybean plant showed considerable differences depending upon the isoflavone content. Our results suggested that soybean leaves and seeds might be useful materials for functional foods.
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Affiliation(s)
- Woo Duck Seo
- Division of Crop Foundation, National Institute of Crop Science, Rural Development Administration, Wanju, Jeonbuk, 55365 Korea
| | - Jae Eun Kang
- Division of Research Development and Education, National Institute of Chemical Safety (NICS), Ministry of Environment, Daejeon, 34111 Korea
| | - Sik-Won Choi
- Division of Crop Foundation, National Institute of Crop Science, Rural Development Administration, Wanju, Jeonbuk, 55365 Korea
| | - Kwang-Sik Lee
- Division of Crop Foundation, National Institute of Crop Science, Rural Development Administration, Wanju, Jeonbuk, 55365 Korea
| | - Mi-Ja Lee
- Division of Crop Foundation, National Institute of Crop Science, Rural Development Administration, Wanju, Jeonbuk, 55365 Korea
| | - Ki-Do Park
- Division of Crop Foundation, National Institute of Crop Science, Rural Development Administration, Wanju, Jeonbuk, 55365 Korea
| | - Jin Hwan Lee
- Division of Research Development and Education, National Institute of Chemical Safety (NICS), Ministry of Environment, Daejeon, 34111 Korea
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10
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Lee J, Hwang YS, Kim ST, Yoon WB, Han WY, Kang IK, Choung MG. Seed coat color and seed weight contribute differential responses of targeted metabolites in soybean seeds. Food Chem 2017; 214:248-258. [PMID: 27507473 DOI: 10.1016/j.foodchem.2016.07.066] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Revised: 07/06/2016] [Accepted: 07/10/2016] [Indexed: 10/21/2022]
Abstract
The distribution and variation of targeted metabolites in soybean seeds are affected by genetic and environmental factors. In this study, we used 192 soybean germplasm accessions collected from two provinces of Korea to elucidate the effects of seed coat color and seeds dry weight on the metabolic variation and responses of targeted metabolites. The effects of seed coat color and seeds dry weight were present in sucrose, total oligosaccharides, total carbohydrates and all measured fatty acids. The targeted metabolites were clustered within three groups. These metabolites were not only differently related to seeds dry weight, but also responded differentially to seed coat color. The inter-relationship between the targeted metabolites was highly present in the result of correlation analysis. Overall, results revealed that the targeted metabolites were diverged in relation to seed coat color and seeds dry weight within locally collected soybean seed germplasm accessions.
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Affiliation(s)
- Jinwook Lee
- Department of Horticultural Science, Mokpo National University, Muan 58554, Republic of Korea
| | - Young-Sun Hwang
- Department of Herbal Medicine Resource, Kangwon National University, Samcheok 25949, Republic of Korea; Department of Biology, University of Texas-Arlington, Arlington, TX 76019, USA
| | - Sun Tae Kim
- Department of Plant Bioscience, Pusan National University, Miryang 50463, Republic of Korea
| | - Won-Byong Yoon
- Department of Food Science and Biotechnology, Kangwon National University, Chuncheon 24341, Republic of Korea
| | - Won Young Han
- Department of Functional Crop, National Institute of Crop Science, Miryang 50424, Republic of Korea
| | - In-Kyu Kang
- Department of Horticultural Science, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Myoung-Gun Choung
- Department of Herbal Medicine Resource, Kangwon National University, Samcheok 25949, Republic of Korea.
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11
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Azizul Haque M, Hwang CE, Lee HY, Ahn MJ, Sin EC, Nam SH, Joo OS, Kim HJ, Lee SW, Kim YG, Ko KH, Goo YM, Cho KM. Comparison of Isoflavone Contents and Antioxidant Effect in Cheonggukjang with Black Soybean Cultivars by Bacillus subtilis CSY191. ACTA ACUST UNITED AC 2016. [DOI: 10.5338/kjea.2016.35.1.11] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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12
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Effects of roasting on the phytochemical contents and antioxidant activities of Korean soybean (Glycine max L. Merrill) cultivars. Food Sci Biotechnol 2015. [DOI: 10.1007/s10068-015-0203-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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13
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Hwang CE, An MJ, Lee HY, Lee BW, Kim HT, Ko JM, Baek IY, Seo WT, Cho KM. Potential Probiotic Lactobacillus plantarum P1201 to Produce Soy-yogurt with Enhanced Antioxidant Activity. ACTA ACUST UNITED AC 2014. [DOI: 10.9721/kjfst.2014.46.5.556] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Enhancement of total phenolic and isoflavone-aglycone contents and antioxidant activities during Cheonggukjang fermentation of brown soybeans by the potential probiotic Bacillus subtilis CSY191. Food Sci Biotechnol 2014. [DOI: 10.1007/s10068-014-0073-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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15
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Comparative assessment of compositional components, antioxidant effects, and lignan extractions from Korean white and black sesame (Sesamum indicum L.) seeds for different crop years. J Funct Foods 2014. [DOI: 10.1016/j.jff.2014.01.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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16
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Hwang CE, Seo WT, Cho KM. Enhanced Antioxidant Effect of Black Soybean by Cheonggukjang with Potential Probiotic Bacillus subtilis CSY191. ACTA ACUST UNITED AC 2013. [DOI: 10.7845/kjm.2013.3070] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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17
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Lee J, Hwang YS, Chang WS, Moon JK, Choung MG. Seed maturity differentially mediates metabolic responses in black soybean. Food Chem 2013; 141:2052-9. [PMID: 23870927 DOI: 10.1016/j.foodchem.2013.05.059] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 04/03/2013] [Accepted: 05/09/2013] [Indexed: 10/26/2022]
Abstract
The soybean seed is placed in the middle of the morphological and developmental alterations, such as changes in seed size, weight, and colour, and alteration of the composition and contents of metabolites during maturation. In this study, we used black soybean seeds to investigate the effect of maturity on metabolite levels at different maturity stages. Seeds were sorted into five maturity categories, from M1 to M5, based on seed size and external pigmentation. Maturity stages M1, M3, and M5 are equivalent to R6, R7, and R8 on the soybean reproductive growth stage scale, indicating full seed, beginning maturity, and full maturity, respectively. As seed maturation progressed, the seed size decreased and the water soluble extract changed, indicating that a change of seed pigmentation occurred. At the same time, numerous metabolites responded differentially to seed maturation. The partial least squares (PLS) scores plot indicated that the metabolic alteration during maturation was clearly visible. Furthermore, isoflavones were highly associated with seed maturity on the PLS loading plot while fatty acids, glucose, fructose, and sucrose were less linked with seed maturity, indicating that those metabolites responded less to seed maturation. Overall, the results indicate that each category of metabolites is mediated differentially during maturation in black soybean seeds.
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Affiliation(s)
- Jinwook Lee
- USDA-ARS, Tree Fruit Research Laboratory, 1104 North Western Avenue, Wenatchee, WA 98801, USA
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18
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Lee JH, Lee BW, Kim B, Kim HT, Ko JM, Baek IY, Seo WT, Kang YM, Cho KM. Changes in phenolic compounds (Isoflavones and Phenolic acids) and antioxidant properties in high-protein soybean (Glycine max L., cv. Saedanbaek) for different roasting conditions. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s13765-013-3048-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Wang Z, Ma X, Zhou W, Min M, Cheng Y, Chen P, Shi J, Wang Q, Liu Y, Ruan R. Oil crop biomass residue-based media for enhanced algal lipid production. Appl Biochem Biotechnol 2013; 171:689-703. [PMID: 23881783 DOI: 10.1007/s12010-013-0387-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Accepted: 07/02/2013] [Indexed: 11/26/2022]
Abstract
The aim of this study was to evaluate the use of hydrolysates from acid hydrolysis of four different oil crop biomass residues (OCBR) as low cost culture media for algae growth. The one-factor-at-a-time method was used to design a series of experiments to optimize the acid hydrolysis conditions through examining the total nitrogen, total phosphorus, chemical oxygen demand, and ammonia nitrogen in the hydrolysates. The optimal conditions were found to be using 3% sulfuric acid and hydrolyzing residues at 90 °C for 20 h. The hydrolysates (OCBR media) produced under the optimal conditions were used to cultivate the two algae strains, namely UM258 and UM268. The results from 5 days of cultivation showed that the OCBR media supported faster algae growth with maximal algal biomass yield of 2.7 and 3 g/L, respectively. Moreover, the total lipids for UM258 and UM268 were 54 and 35%, respectively, after 5 days of cultivation, which suggested that the OCBR media allowed the algae strains to accumulate higher lipids probably due to high C/N ratio. Furthermore, over 3% of omega-3 fatty acid (EPA) was produced for the two algae strains. In conclusion, OCBR media are excellent alternative for algae growth and have a great potential for large-scale production of algae-based ingredients for biodiesel as well as high-value food and pharmaceutical products.
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Affiliation(s)
- Zhen Wang
- Center for Biorefining, Bioproducts and Biosystems Engineering Department, University of Minnesota, 1390 Eckles Ave, Saint Paul, MN, 55108, USA
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An effective and green method for the extraction and purification of aglycone isoflavones from soybean. Food Sci Biotechnol 2013. [DOI: 10.1007/s10068-013-0135-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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21
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Belén F, Benedetti S, Sánchez J, Hernández E, Auleda J, Prudêncio E, Petrus J, Raventós M. Behavior of functional compounds during freeze concentration of tofu whey. J FOOD ENG 2013. [DOI: 10.1016/j.jfoodeng.2013.01.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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22
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Li XT, Zhao YJ, Jiang CF, Zhang HQ, Yu AM. Determination of amino acids in Panax notoginseng by microwave hydrolysis and derivatization coupled with capillary zone electrophoresis detection. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-2325-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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