Park Jae-Hee, Lee Minhee, Park Eunju
Department of Food and Nutritional Science, Kyungnam University, Gyeongnam 631-701, Korea.
Prev Nutr Food Sci. 2014 Dec;19(4):291-8. doi: 10.3746/pnf.2014.19.4.291. Epub 2014 Dec 31.
The aim of this study was to investigate the antioxidant activity of orange (Citrus auranthium) flesh (OF) and peel (OP) extracted with acetone, ethanol, and methanol. Antioxidant potential was examined by measuring total phenolic content (TPC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity (RSA), total radical-trapping anti-oxidant potential (TRAP), oxygen radical absorbance capacity (ORAC), and cellular antioxidant activity (CAA). The comet assay was used to determine the protective effects of OF and OP against H2O2-induced DNA damage. TPC was highest in the acetone extracts of OF and OP. DPPH RSA was also higher in the acetone extracts than in the ethanol extracts. The DPPH RSA was highest in the acetone extracts of OF. The TRAP and ORAC values of the all extracts increased in a dose-dependent manner. In the TRAP assay, the acetone extracts of OF and OP had the lowest IC50 values. In the CAA assay, the methanol and acetone extracts of OP had the lowest IC50 values. All of the samples protected against H2O2-induced DNA damage in human leukocytes, as measured by the comet assay, but the acetone extracts of OP had the strongest effect. These results suggest that acetone is the best solvent for the extraction of antioxidant compounds from OF and OP. Furthermore, the high antioxidant activity of OP, which is a by-product of orange processing, suggests that it can be used in nutraceutical and functional foods.
本研究的目的是调查用丙酮、乙醇和甲醇提取的橙子(酸橙)果肉(OF)和果皮(OP)的抗氧化活性。通过测量总酚含量(TPC)、2,2-二苯基-1-苦基肼(DPPH)自由基清除活性(RSA)、总自由基捕获抗氧化能力(TRAP)、氧自由基吸收能力(ORAC)和细胞抗氧化活性(CAA)来检测抗氧化潜力。采用彗星试验来确定OF和OP对H2O2诱导的DNA损伤的保护作用。OF和OP的丙酮提取物中TPC最高。丙酮提取物中的DPPH RSA也高于乙醇提取物。OF的丙酮提取物中DPPH RSA最高。所有提取物的TRAP和ORAC值均呈剂量依赖性增加。在TRAP试验中,OF和OP的丙酮提取物IC50值最低。在CAA试验中,OP的甲醇和丙酮提取物IC50值最低。通过彗星试验测定,所有样品均能保护人类白细胞免受H2O2诱导的DNA损伤,但OP的丙酮提取物效果最强。这些结果表明,丙酮是从OF和OP中提取抗氧化化合物的最佳溶剂。此外,OP作为橙子加工的副产品具有较高的抗氧化活性,这表明它可用于营养保健品和功能性食品。