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KMID : 0903519980410030234
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1998 Volume.41 No. 3 p.234 ~ p.239
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Nondestructive Evaluation of Free Acid Content in Apples using Near - infrared Spectroscopy
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Abstract
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In non-destructive evaluation of free acid content in apples by near- infrared spectroscopy(NIRS), browning and heat treatment of squeezed apple juice affected to the accuracy but titrable alkali concentration did not. The free acid content in apples after harvest was able to determine using different apples in harvest time for calibration making. The result of MLR multiple correlation coefficient(R) was 0.77 and standard error of prediction(SEP) was 0.03%. The free acid content in apples during storage was able to determine using calibration equation established with stored apples, R was 0.90 and SEP was ca. 0.04%. The prediction accuracy by LAIR was not sufficient for use of quantitative analysis of free acid content in apple, but classification of law and high level in acid content was supposed to be applicable.
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