• 한국환경보건학회지
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• 제33권3호
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• pp.195-201
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• 2007

The objective of present study was to examine the composition of functional components (isoflavones, phytic acid, and saponin) in hypocotyls and cotyledons of six traditional Korean soybeans, namely Cheongtae, Seoritae, Jinjoori, Subaktae, Yutae, and Huktae. Three 'family' of isoflavones, as four chemical structures were present in hypocotyls and cotyledons of six soybean cultivars: the aglycones genistein, daidzein, and glycitein; the glycosides genistin, daidzin, and glycitin; the acetylglycosides 6"-O-acetylgenistin, 6"-O-acetyldaidzin, and 6"-O-acetylglycitin; and the malonylglycosides 6"-O-malonylgenistin, 6"-O-malonyldaidzin, and 6"-O-malonylglycitin. Isoflavone contents of hypocotyls and cotyledons differed among the cultivars, and glucosides and malonylglucosides accounted for more than 90% of the total phytoestrogens, with the remaining $1\sim7%$ taken up by aglycones. Concentrations of isoflavones in cotyledons were approximately about $10\sim20%$ of respective hypocotyls. Contents of phytic acids in hypocotyls and cotyledons of the selected soybean cultivars were $1.21\sim1.70%$ and $2.59\sim3.01%$, respectively. Hypocotyls of Seoritae showed the lowest content of phytic acid with 1.21%, while cotyledons of Cheongtae showed the highest content with 3.01%. The sapogenol concentrations ranged from $13.58mg/100g\sim20.82mg/100g$ for hypocotyls and $0.95mg/100g\sim2.55mg/100g$ for cotyledons showing that concentrations of saponin are $7\sim10$ times higher in hypocotyls than in cotyledons of respective soybeans. For both hypocotyls and cotyledons the sapogenol A were present in higher concentrations than soyasapogenol B.

• 한국작물학회지
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• 제51권spc1호
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• pp.166-173
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• 2006

본 연구는 국내육성 콩 품종 및 전통식품의 우수성을 입증하고, 생리활성이 우수한 고품질의 신품종 육성을 위한 기초기반기술 확립의 일환으로 group A soyasaponin의 분리 및 정제에 관한 연구를 수행한 결과를 요약하면 다음과 같다. 1. 콩 종실로부터 hypocotyl을 분리하고 탈지한 후 automated solvent extractor(ASE)를 이용하여 MeOH 추출 후 flash column($150mm{\times}40mm$ i.d.)을 이용하여 총 14개의 fraction을 분리하였다. 2. Flash column으로 얻어진 8 및 9번 fraction(Fraction-I) 을 Luna $C_{18}$ semipreparative reverse phase column($250cm{\times}50mm$ i.d.)을 이용하여 Fast PCLC로 정제하여 미지화합물(unknown compound : UKC)(Fr-I-2)을 분리하였다. 3. Compound 1을 NMR($^1H-NMR$, 600 MHz; $^{13}C-NMR$, 100 MHz; DEPT), IR, UV 및 ESI-MS 분석을 통하여 구조를 동정한 결과 분자량(MW)이 1436.6이며, 분자식이 $C_{67}H_{104}O_{33}$인 group A 계열의 acetyl soyasaponin $A_1$으로 확인되었다.

• Journal of Plant Biotechnology
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• 제50권
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• pp.70-75
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• 2023

In legumes, soyasaponins, one of triterpenoid saponins, are major components of secondary metabolites with a more diverse array of bioactive chemicals. Although the biosynthetic pathway of soyasaponins has been largely studied in soybean, the study on the soyasaponin contents and biosynthesis-related gene expression in pea (Pisum sativum L.) is poorly understood. Here, we found the accumulation of only soyasaponin Bb component in the sprouts of two Korean domestic pea cultivars (Dachung and Sachul). This pattern was consistent with our observation that increased expression of PsUGT73P2 and PsUGT91H4 genes, but not PsCYP72A69, could be responsible for biosynthesis of only soyasaponin Bb in pea by examining their gene expression. However, gradual accumulation of soyasaponin Bb at developmental stages was not consistent with the expression of PsUGT73P2 and PsUGT91H4, suggesting that the changes of their protein activities may affect the accumulation patterns of soyasaponin Bb. We also revealed that the increased expression levels of PsUGT73P2 and PsUGT91H4 during light to dark transition led to increase of soyasaponin Bb contents. Collectively, our results provided a molecular basis of metabolic engineering for enhancing useful soyasaponin Bb metabolites in Korean domestic pea cultivars.