Rapid Differentiation of Commercial Juices and Blends
by Using Sugar Profiles Obtained by Capillary Zone Electrophoresis
with Indirect UV Detection
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Abstract
A method for the
determination of sugars in several fruit juices
and nectars by capillary zone electrophoresis with indirect UV–vis
detection has been developed. Under optimal conditions, commercial
fruit juices and nectars from several fruits were analyzed, and the
sugar and cyclamate contents were quantified in less than 6 min. A
study for the detection of blends of high-value juices (orange and
pineapple) with cheaper alternatives was also developed. For this
purpose, different chemometric techniques, based on sugar content
ratios, were applied. Linear discriminant analysis showed that fruit
juices can be distinguished according to the fruit type, juice blends
also being differentiated. Multiple linear regression models were
also constructed to predict the adulteration of orange and pineapple
juices with grape juice. This simple and reliable methodology provides
a rapid analysis of fruit juices of economic importance, which is
relevant for quality control purposes in food industries and regulatory
agencies