Chemical components and antioxidative activity of Korean gold kiwifruit

Abstract

The chemical components and antioxidative activity of Korean gold kiwifruit were investigated. The values of pH, soluble solid and total acidity were 4.43±0.16, 17.01±0.04°Brix. and 0.082±0.02%, respectively. Hunter L, a, and b values were 49.80±0.24, -6.79±0.02, and 19.72±0.18 value, respectively. Proximate compositions were as follows; moisture 78.62±2.26%, crude protein 1.34±0.25%, crude lipid 0.70±0.06%, crude fiber 1.99±0.13%, crude ash 0.99±0.26%, and carbohydrate 16.36±1.23%, respectively. Mineral elements were K 265.86±5.00, P 71.82±29.18, and Ca 23.84±2.10 mg%, respectively. Free sugar compositions were sucrose (1.04±0.18%), glucose (2.17±0.21%) and fructose (1.86±0.11%). Amino acid contents of Korean gold kiwifruit was very rich in glutamic acid 86.51±5.58 mg/100 g and deficient in tyrosine 15.00±4.91 mg/100 g. Organic acid compositions were quinic acid (6.65±0.21, mg/g), malic acid (1,62±0.13 mg/g) and citric acid (4.82±0.21 mg/g). Contents of ascorbic acid and total phenols were 0.27±0.06 mg/g and 0.047±0.002 mg/g, respectively. The DPPH radical scavenging activity and reducing power of the water extract from Korean gold kiwifruit was 86.87% and 1.96 at a concentration of 25 mg/mL. The water extract showed considerable antioxidative activity against linoleic acid autoxidation in a dose-dependent manner.