Fig. 4.
Changes in conjugated dienoic acid in corn oil containing ascorbic acid (10–84 ppm) at 60 °C with different relative humidity. Different capital letters on the bar are significant within the same relative humidity at 0.05 and different small letters are significant among different relative humidity at 0.05.
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3.3. Relationship between antioxidant properties of ascorbic acid and concentration and relative humidity
The relationship between the antioxidant or pro-oxidant properties of ascorbic acid and the concentration and relative humidity are shown in Fig. 5. Each point was calculated as data for samples containing ascorbic acid and salt solutions divided by data for samples without ascorbic acid or salt solution (CON W/O). Ascorbic acid showed different antioxidant properties depending on the concentration and relative humidity based on headspace oxygen content (Fig. 5a) and CDA value (Fig. 5b). Based on headspace oxygen values, all samples containing ascorbic acid had antioxidant properties irrespective of relative humidity except for samples with 10 ppm ascorbic acid under SC conditions (Fig. 5a). In the case of CDA values, all of the samples containing ascorbic acid showed antioxidant properties irrespective of relative humidity (Fig. 5b).