• Title/Summary/Keyword: Biology and Life Science

Search Result 4,264, Processing Time 0.044 seconds

Rapid High Performance Liquid Chromatographic Quantification of Major Isoflavones in Soybeans and Soybean Pastes

  • Kim, Won-Chan;Kwon, Soon-Ho;Rhee, In-Koo;Hur, Jong-Moon;Jeong, Hyun-Hee;Choi, Sun-Ha;Lee, Kyung-Bok;Kang, Young-Hwa;Song, Kyung-Sik
    • Food Science and Biotechnology
    • /
    • v.15 no.1
    • /
    • pp.24-27
    • /
    • 2006

  • A simple HPLC quantification method was developed for genistein, genistin, daidzein, and daidzin in soybeans and soybean products. The procedure used a $4.6{\times}100\;mm$ $Chromolith^{(R)}$ RP-18e column with a mobile phase of 1% HOAc in 20% MeOH to 1% HOAc in 80% MeOH for 10 min. The injection volume was $2\;{\mu}L$ at a flow rate of 2 mL/min. Detection was carried out under UV at 254 nm. Under these conditions, the major isoflavones daidzein, daidzin, genistein, and genistin in soybean and soybean pastes were eluted within 7 min with baseline separation. Optimal extraction of the above four major isoflavones was achieved when 40 g of soybean or soybean paste was refluxed in 100 mL of 95% ethanol for 2 hr. Ten different soybean cultivars and nine commercial soybean pastes were analyzed by this method. The total isoflavone content was highest in the cultivar Somyung ($2,497\;{\mu}g/g$ dry weight). The isoflavone content in soybean pastes varied widely from manufacturer to manufacturer (an almost five-fold difference between the highest and lowest values). Such variations were presumably due to differences in fermentation conditions, type of soybeans used, and levels of such additives as starch and salt.

  • PDF KSCI

Notes on Six Unrecorded Indigenous Species of Filamentous cyanobacteria (Cyanophyceae, Cyanophyta) in Korea

  • Yim, Byoung Cheol;Song, Mi Ae;Bang, Sung Do;Yoon, Sung Ro;Lee, Ok Min
    • Korean Journal of Environmental Biology
    • /
    • v.35 no.3
    • /
    • pp.296-304
    • /
    • 2017

  • Samples were collected between August 2016 and May 2017 at Sangju-si, Gyeongsangbuk-do, Jeju-do, and Uljin-gun, Gangwon-do. As a result, one genus and six species were newly recorded in Korea. The unrecorded indigenous genus was Borzia, and the six species were Anagnostidinema acutissimum, Komvophoron bourrellyi, Hydrocoleum stankovicii, Borzia trilocularis, Phormidium tinctorium and Pseudanabaena lohchoides. Phormidium tinctorium and Pseudanabaena lohchoides had been reported to inhabit freshwater, but in this study, these were found in brackish water. It had also been reported that B. trilocularis trichomes are composed of up to 8 cells, but in this study, a maximum of 10 cells was observed.

  • https://doi.org/10.11626/KJEB.2017.35.3.296 인용 PDF KSCI