期刊
PROCESSES
卷 10, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/pr10020206
关键词
Moringa; apple; ascorbic acid; citric acid; potassium sorbate; antioxidant; polyphenol oxidase
资金
- Pioneer Foods Group, South Africa
- Cape Peninsula University of Technology, Bellville, South Africa
This study aimed to find alternatives to sulphite as a preservative for dried fruits. The results showed that an increase in citric acid concentration significantly increased the lightness and decreased the redness of the dried apple slices.
This study aimed to find alternatives to sulphite as a preservative for dried fruits. Granny Smith apples were sanitised in a 200 ppm sodium chlorite solution, de-cored, peeled, and cut into slices. The sliced apples were pre-treated/dipped in a water solution containing the three weak acids, namely, ascorbic acid (AA), citric acid (CA), and potassium sorbate (PS) as well as Moringa oleifera leaf extract powder (MOLEP). A screening fractional factorial experiment consisting of five independent variables (AA, CA and PS, time and temperature and MOLEP) constrained at their upper and lower levels (AA: 0.5 to 2.0%, CA: 0.3 to 2.0%, MOLEP: 0.1 to 0.2%, time: 7 to 15 h and temperature: 57 to 70 degrees C) were evaluated for their effect on the colour of the dried sliced apples. An increase in the concentration of the CA significantly increased the lightness (p = 0.05) and decreased the redness (p = 0.0022) of the dried apple slices. AA and PS did not impact the lightness of the dried sliced apples. A dipping solution of citric acid at 2.0%, Moringa oleifera leaf extract powder at 0.1%, and drying time of 7 h at 70 degrees C effectively minimized the discolouration of the dried sliced apples.
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