Quality assessment of commercial apple juices

Edward Muntean, Nicoleta Muntean

Volume 16, Issue 3;
Pages: 346-350;
ISSN: 2069-0053 (print) (former: ISSN:1453-1399), Agroprint;
ISSN (online):2068 – 9551
This study presents the use of carbohydrate chromatography, refractometry and pH-metry for obtaining the profiles of fructose, glucose, sucrose together with pH and Brix as indicators of apple juice quality. Commercial apple juices originating from the Romanian market were analysed; using a minimum sample workup, this approach is low time-consuming, enabling also the detection of common sweetening practices. Principal component analysis (PCA) of the obtained data revealed a data structure with three classes: I - unsweetened apple juices; II - apple juices sweetened with glucose-fructose syrup; III - apple juices sweetened with saccharose. A final cluster analysis was accomplished with Ward’s method, leading to the classification of the analyzed juices according to their established carbohydrates composition, the resulted three main clusters confirming the class structure obtained using PCA.
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