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Hunseong Kim,Kyunglyung Kim,Dongyup Hahn 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Phenanthrenes are representative compounds found in the genus Dioscorea and have many bioactivities. The recent study confirmed that phenanthrenes were present in higher amounts in the peel than the flesh of Dioscorea. Dioscorea is not highly storable, so most of them are peeled and then vacuum-packed or dried and then powdered before distribution. In this process, many peels are produced as a byproduct, discarded because there is no use. This study was conducted to develop an optimized extraction method for peels for other industries such as cosmetics. As standard for evaluation of the extraction method, we used three compounds isolated from Dioscorea batatas. A quantitative analysis method using HPLC was developed to quantify the phenanthrenes in the extract, and method validation was performed. Quantitative analysis was performed in 1 to 10 μg/mL concentration of the standard compounds and confirmed acceptable linearity, accuracy, and precision. Four different conditions extracted the peels, and quantitative analysis was performed. As a result, it showed the highest extraction efficiency in steaming pretreatment, high ethanol concentration, and high extraction temperature.
Kim, Hunseong,Cao, Thao Quyen,Yeo, Chae-eun,Shin, Seung Ho,Kim, Hiyoung,Hong, Dong-Hyuck,Hahn, Dongyup The Korean Society for Microbiology and Biotechnol 2022 Journal of microbiology and biotechnology Vol.32 No.8
Phenanthrenes are bioactive phenolic compounds found in genus Dioscorea, in which they are distributed more in peel than in flesh. Recent studies on phenanthrenes from Dioscorea sp. peels have revealed the potential for valuable biomaterials. Herein, an analytical method using high-performance liquid chromatography (HPLC) for quantitation of bioactive phenanthrenes was developed and validated. The calibration curves were obtained using the phenanthrenes (1-3) previously isolated from Dioscorea batatas concentrations in the range of 0.625-20.00 ㎍/ml with a satisfactory coefficient of determination (R<sup>2</sup>) of 0.999. The limit of detection (LOD) and the limit of quantification (LOQ) values of the isolated phenanthrenes ranged from 0.78-0.89 and 2.38-2.71 ㎍/ml, respectively. The intraday and interday precision ranged from 0.25-7.58%. The recoveries of the isolated phenanthrenes were from 95 to 100% at concentrations of 1.25, 2.5, and 5.0 ㎍/ml. Additionally, phenanthrenes (1-3) were found in all investigated peel extracts. Hence, the developed method was encouraging for the quantitative analysis of phenanthrenes in genus Dioscorea.
아미노 결합 정지상 HPLC 컬럼을 이용한 마 껍질의 allantoin 함량 분석
이미정,김자민,김훈성,한동엽,Lee, Mijeong,Kim, Ja Min,Kim, Hunseong,Hahn, Dongyup 한국식품위생안전성학회 2021 한국식품위생안전성학회지 Vol.36 No.4
마에는 다양한 기능성 성분이 함유되어 있어서 식용 및 약용으로 다양하게 이용되고 있다. 특히 allantoin은 대표적인 마의 2차 대사산물로서 의약품 및 기능성 화장품 제조에도 활용되는 고부가가치 산물이다. 본 연구에서는 아미노 결합 정지상 HPLC 컬럼을 이용하여 마의 속과 껍질의 allantoin 함량을 분석하였다. Allantoin 표준용액의 검량선의 결정계수(R<sup>2</sup>)값은 0.9999로 높은 직진성을 보였으며, 검출한계(LOD)와 정량한계(LOQ)는 각각 0.0229 mg/mL 및 0.0694 mg/mL로 설정되었다. 마 속과 껍질의 건조중량 기준 allantoin 함량은 각각 3.09±0.02 mg/g, 3.91±0.11 mg/g으로 속보다 껍질에 더 많은 allantoin이 함유되어있음을 확인하였다. 따라서 이러한 결과를 토대로 향후 농업부산물인 마껍질이 새로운 고부가가치 기능성 소재로 활용될 수 있음을 확인하였다. Yam (Dioscorea japonica) is widely utilized as food and a pharmaceutical ingredient as it contains a variety of valuable constituents. Allantoin is one of the bioactive components in yam that is used in pharmaceutical and cosmetic industry. This study was conducted to analyze and compare the allantoin content of yam flesh and peel by HPLC analytical method using an amino bonded-phase column to make up for the limitations of the previous HPLC analytical methods. The allantoin contents of yam flesh and peel were 3.09±0.025 and 3.91±0.11 mg/g (dry weight), respectively. The results of this study indicated that yam peel has higher allantoin content than yam flesh, and that the discarded yam peel could be used as a source for high value-added functional materials.