2.8. Determination of ascorbic acid
The ascorbic acid contents were determined by the method reported
by Lee and Coates [25] with slight modifications using Agilent
1100 series HPLC (Agilent Technologies, USA), which consisted
of a model G1379A degasser, a model G1311A pump, a model
G1316A column oven and model G1315B diode array detector
(DAD). Before injection into column, 5.0 mL sample was filtered
through syringe filters of 0.45 lm diameter. Sample volume of
20 lL with known concentration was injected into a Tskgel ODS-
100Z C18 column (4.6 mm 150 cm, 5 lm, Tosoh, Japan). Methanol
30% (v/v) was used as a mobile phase with a flow rate of
1.0 mL/min. Eluate was detected at 280 nm. Standard ascorbic acid
solutions were used to prepare a calibration curve and the results
were shown as mg/100 mL of apple juice.
2.8. Determination of ascorbic acid
The ascorbic acid contents were determined by the method reported
by Lee and Coates [25] with slight modifications using Agilent
1100 series HPLC (Agilent Technologies, USA), which consisted
of a model G1379A degasser, a model G1311A pump, a model
G1316A column oven and model G1315B diode array detector
(DAD). Before injection into column, 5.0 mL sample was filtered
through syringe filters of 0.45 lm diameter. Sample volume of
20 lL with known concentration was injected into a Tskgel ODS-
100Z C18 column (4.6 mm 150 cm, 5 lm, Tosoh, Japan). Methanol
30% (v/v) was used as a mobile phase with a flow rate of
1.0 mL/min. Eluate was detected at 280 nm. Standard ascorbic acid
solutions were used to prepare a calibration curve and the results
were shown as mg/100 mL of apple juice.
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