Variation in isoflavone of soybean cultivars with location and storage duration.
Fifteen soybean [Glycine max (L.) Merrill] cultivars were grown in Seoul, Suwon, and Kyongsan, Korea, in 1998, 1999, and 2000, and their isoflavone contents were assessed. After harvest, the beans were stored for 3 years at room temperature. Soybean isoflavones were analyzed using high-performance liquid chromatography (HPLC) within each crop year and after storage. Total isoflavone contents ranged from 188.4 to 685.6 mg 100 g(-1) in 1998, from 218.8 to 948.9 mg 100 g(-1) in 1999, and from 293.1 to 483.0 mg 100 g(-1) in 2000. The year x variety, and year x location x variety interactions were significantly different in 1998, the year x location, year x variety, and year x location x variety interactions were significantly different in 1999, and the year x variety interaction was significantly different in 2000 for total and individual isoflavone contents. Total isoflavone contents of soybeans stored for 1 year were only slightly higher than those of soybeans stored for 2 or 3 years. However, the concentrations of individual isoflavones, especially 6' '-O-malonyldaidzin and 6' '-O-malonylgenistin, decreased markedly in soybeans stored for 2 or 3 years. These data suggest that it may be feasible to improve soybean cultivars with higher antioxidative substances.
Lee
Sun Joo
SJ
College of Life and Environment, Konkuk University, Seoul 143-701, Korea.
Ahn
Joung Kuk
JK
Kim
Seung Hyun
SH
Kim
Jung Tae
JT
Han
Sang Jun
SJ
Jung
Mun Yhung
MY
Chung
Ill Min
IM
D002851:Chromatography, High Pressure Liquid; D005519:Food Preservation; D007529:Isoflavones / Q000032:analysis*; D007723:Korea; D013025:Glycine max / Q000737:chemistry*; D013997:Time Factors
D007529:Isoflavones