title: Quality control of fruit juices by using organic acids determined by capillary zone electrophoresis with poly(vinyl alcohol)-coated bubble cell capillaries.
abstract: An enhanced method for the determination of organic acids in several fruit juices by capillary zone electrophoresis (CZE) with direct UV-Vis detection has been developed in this work. First, a study with simulated real juice samples was done to find the best separation conditions. Next, several commercial fruit juices were analyzed, and the organic acid contents were quantified in less than 12 min using a poly(vinyl alcohol)-coated fused-silica 'bubble cell' capillary. The present method is reliable, fast and provides detection limits comprised between 0.1 and 2.5 μg mL(-1). Moreover, different chemometric techniques, based on CZE data, were examined. Linear discriminant analysis allowed the differentiation of fruit juices according to the fruit type, whereas multiple linear regression models predicted the percentages of orange and pineapple juices in binary blends with grape. Thus, the present methodology is of utmost interest for routine and quality control purposes in food industries.
authors.affiliation: Department of Analytical Chemistry, University of Valencia, C. Doctor Moliner 50, E-46100 Burjassot, Valencia, Spain.
authors.forename: María
authors.initials: M
authors.lastname: Navarro-Pascual-Ahuir
authors.affiliation: Department of Analytical Chemistry, University of Valencia, C. Doctor Moliner 50, E-46100 Burjassot, Valencia, Spain.
authors.forename: María Jesús
authors.initials: MJ
authors.lastname: Lerma-García
authors.affiliation: Department of Analytical Chemistry, University of Valencia, C. Doctor Moliner 50, E-46100 Burjassot, Valencia, Spain.
authors.forename: Ernesto F
authors.initials: EF
authors.lastname: Simó-Alfonso
authors.affiliation: Department of Analytical Chemistry, University of Valencia, C. Doctor Moliner 50, E-46100 Burjassot, Valencia, Spain. Electronic address: jmherrer@uv.es.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Herrero-Martínez
mesh_terms: D001628:Beverages / Q000032:analysis*; D019075:Electrophoresis, Capillary / Q000379:methods*; D000067030:Fruit and Vegetable Juices / Q000032:analysis*; D011143:Polyvinyl Chloride / Q000032:analysis*; D011786:Quality Control
chemical_list: D011143:Polyvinyl Chloride
keywords: CZE; Fruit juice; Linear discriminant analysis; Multiple linear regression; Organic acid; Quality control