Determination of Total Antioxidant Capacity of Some Fruit Juices and Noncarbonated Soft Drinks by a FIA-CL Method

作者：Popa Claudia Valentina; Danet Andrei Florin^*; Jipa Silviu; Zaharescu Traian

来源：Revista de Chimie, 2012, 63(10): 978-983.

• total antioxidant capacity
• chemiluminescence analysis
• juices
• soft drinks
• L-ascorbic acid (vitamin C)
• uric acid

Total antioxidant capacity (TAC) of juices obtained from apples, pear, banana, kiwi fruit, lemon, orange, cranberry and sea buckhorn and seven commercial noncarbonated soft drinks was investigated by using a flow injection analysis with chemiluminescence detection (FIA-CL) method. This method allows TAC determination within 0.8 - 300 micromoles L-1 domains of L-ascorbic and uric acids. A relative standard deviation (RSD) was up to 3% (n = 10, c = 8 mu M uric acid and 20 mu M L-ascorbic acid). TAC determined for the analyzed juices samples was between 3.96 and 37.5 milligrams of L-ascorbic acid equivalents/100 g fresh fruits. Berries juices were also analyzed after being kept for 24 h since preparation at room temperature in properly sealed vessels and found that TAC values decrease by approximately 40%. The TAC values determined for the analyzed noncarbonated soft drinks vary between 5.46 - 66.9 mg L-ascorbic acid equivalents/100 mL samples and between 3.20 and 104 mg uric acid equivalents/100 mL samples.

• 出版日期2012-10