• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3766-3773
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• 2014

This study examined the antioxidant capacities of apple peel, grape peel, and sweet potato peel. The antioxidant activities were evaluated using total phenolic contents, total flavonoids contents, DPPH radical scavenging activity, ABTS radical cation scavenging activity, FRAP reducing power, and ORAC assay. The total phenolic (7.76 ${\mu}M$ quercetin equivalent/g peel) and total flavonoids (1.03 ${\mu}M$ quercetin equivalent/g peel) contents in apple peel were significantly higher than in grape peel and sweet potato peel (P<0.05). The scavenging activities of DPPH and ABTS radicals of a 70% ethanol extract of apple peel was 3.2-4.6 and 2.8-5.4 times high than those of grape and sweet potato peel, respectively. In addition, the FRAP reducing power and ORAC assay of 70% ethanol extraction from apple peel were significantly higher than those of the other samples. Therefore, apple peel can be used efficiently as a natural antioxidant.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.57 no.3
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• pp.254-261
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• 2012

To reduce the injury by continuous cropping of sweet potato (Ipomoea batatas (L.) Lam.), the farmer's plant and virus-free plant were cultivated with the density of $70{\times}25cm$ (June 10, 2011) in continuous cropping soil (CCS) and subsoiling reversion soil (SRS). Fertilizer was applied at the rates of 55-63-156 $kg\;ha^{-1}$ ($N-P_2O_5-K_2O$) and 10 $ton\;ha^{-1}$ of cattle manure in CCS, and it was applied the 50% increased cattle manure compost and nitrogen in DRS. Symptoms of viral infection were revealed in the farmer's plant at 30 days after planting, but there were no symptoms in virus-free plant. The yield of virus-free plant was more increased 15% and 10.5% than that of farmer's plant in DRS and CCS, respectively. The yield of sweetpotato in SRS was more increased 8.8% and 3.2% in farmer's plant and virus-free plant compared to CCS, respectively. In DRS, the rate of marketable tuber of virus-free plant was increased by 80% compared to the farmer's plant (60.1%). The virus-free plant was produced the tuber with more brilliant peel color and well-formed shape compared to the farmer's plant. The increased yield of virus-free plant and in SRS soil condition showed a positive relationship (p=0.05) with the number of leaf per plant at 30 days and the number of branch per plant at 120 days after planting. The results showed that the early growth after planting was very important for the development of storage root. Therefore, the deep-subsoil reversion and cultivation of virus-free plant could be reduced the injury by continuous cropping of sweet potato, and increased farm income.

• Korean Journal of Plant Resources
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• v.25 no.1
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• pp.80-88
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• 2012

This study was conducted to clarify the antimicrobial effects and radical scavenging activities of the cosmetic compositions having the natural plant pigments, and to enhance the natural materials utilization of cosmetics. The antimicrobial activities of the fifteen kinds of cosmetic composition having natural plant pigments were evaluated using the agar diffusion method. Most of the cosmetic composition having the natural pigments showed the clear zone formation of growth inhibition against Bacillus subtilis, Staphylococcus aureus, Listeria monocytogenes, Vibrio parahaemolyticus and Aspergillus flavus. Especially, purple sweet potato, bitter melon, mulberry leaf and gromwell showed the higher antimicrobial activities. All the cosmetic compositions were evaluated for their antioxidant activity using DPPH radical scavenging capacity and nitrite scavenging ability activity. Both of the free radical DPPH and nitrite scavenging ability was the highest in the cosmetic compositions of onion peel, and these antioxidant activity was significant differences according to different plant pigments. In this study, we conjectured that the plant pigment had the potent biological activities, therefore these plant resources having functional components could be a good materials for development into source of natural cosmetics.