Abstract
Soybean sprouts are a major food item in Korea. Various studies have been carried out to enhance their yield and nutritional values. The objective of the present study was to examine the influence of persimmon fruit powder and Indolbi, a synthetic plant growth regulator, on the yield and nutritional value of soybean sprouts. Seeds were soaked in tap water containing 0.5%, 1.0%, 2.5% and 5.0% (w/v) persimmon fruit powder and the samples were named as PT-1, PT-2, PT-3, and PT-4, respectively. The yield increment was almost doubled in PT-3 and PT-4 than in the Indolbi treated sprouts on basis of the control. Vitamin C, isoflavones, and total phenolic contents as well as antioxidant potentials (determined by 1,1-diphenyl-2-picrylhydrazyl and superoxide anion radical scavenging assays) were also significantly (p < 0.05) higher in PT-3 compared to the Indolbi treatment and the control. However, total free amino acid and magnesium contents of Indolbi- applied sprouts were higher than in the fruit powder treatments. The overall results of the present study showed that persimmon fruit powder can be an option to enhance the yield and nutritional value of soybean sprouts since, due to potential health hazards, the use of synthetic chemicals like Indolbi is less preferred than the natural products.
Highlights
Soybean (Glycine max L.) sprouts have been established as one of the major vegetables inKorea for a long time
The sprout samples named as PT-1, PT-2, PT-3, and PT-4 were produced from the seeds soaked in tap water containing 0.5%, 1.0%, 2.5% or
The yield and vitamin C content were significantly higher in PT-3 than in INB-treated sprouts
Summary
Soybean (Glycine max L.) sprouts have been established as one of the major vegetables inKorea for a long time. Large amounts of soybean sprouts are produced in Korea each year [1]. Various unwanted constituents or their functions in soybean seeds, for instance, trypsin, chymotrypsin, lipoxygenase activity, phytic acid, and oligosaccharides can be removed or reduced during germination [2,3,4]. The amounts of other desirable constituents such as vitamins, phytosterols, tocopherols, and isoflavones could be increased during the period [3,5]. High dietary isoflavone intake may significantly increase fertility in humans [11]. High in isoflavone/polyphenolic molecules, from conception was found to be advantageous in reducing prostate weight and white adipose tissue deposition while increasing testicular weight, Sertoli cell
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