• Korean Journal of Medicinal Crop Science
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• v.28 no.1
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• pp.21-28
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• 2020

Background: Owing to its high efficiency in lipid and protein production, peanut (Arachis hypogaea L.) is considered one of most important crops world-wide. The kernels of peanuts are undoubtedly the most important product this plant, whereas the skin is almost completely neglected in nutraceutical terms. However, peanut skin contains potentially health-promoting phenolics and dietary fiber, and there is considerable potential for commercial exploitation. In this study, we evaluated the α-glucosidase inhibitory activity of an extract of peanut skin (PS). Methods and Results: The α-glucosidase inhibitory effects of 80% ethanol extracts of peanut (A. hypogaea L. 'Sinpalkwang') skin were evaluated and found to have a half-maximal inhibitory concentration (IC₅₀) value of 1.2 ㎍/㎖. Progress curves for enzyme reactions were recorded spectrophotometrically, and the inhibition kinetics revealed time-dependent inhibition with enzyme isomerization. Furthermore, using ultra-high performance liquid chromatography combined with quadrupole-orbitrap mass spectrometry, we identified 26 compounds in the peanut skin extract, namely, catechin, epicatechin, and 24 proanthocyanidins. Conclusions: The results suggest that peanut skin can be utilized as an effective source of α-glucosidase inhibition in functional foods and nutraceuticals.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.25 no.4
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• pp.86-90
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• 1980

To define the effect of planting time on the flowering of the peanut varieties, Cheonyup banlip and 9 other varieties were planted seven times at 15 day interval from April 15. The days to flowering of all peanut varieties were shortened proportionately with delayed planting time. The significant negative correlation (r =-0.86**) was recognized between the shortening rate of the days to flowering by later planting time and the days to flowering of peanuts planted at standard seeding time. The short day treatment did not have any effect on the chance of the days to flowering of each variety. A significant negative correlation was recognized between the number of flowers and the days to flowering of the peanut varieties planted at standard seeding time.