title: Potentiometric flow injection determination of glycerol in distilled spirits.
abstract: A single-line flow injection system including a tubular periodate-selective electrode without inner reference solution is proposed for glycerol determination in distilled spirits, based on oxidation of this polyol by periodate. Interferences due to 5.0 mg L(-1) Cu, 5000 mg L(-1) sucrose, and 3000 mg L(-1) fructose plus glucose were investigated. The procedure is characterized by a linear response for 20-500 mg L(-1) glycerol (r > 0.9999, n = 7), a relative standard deviation of results of <0.03, and an analytical throughput of 30 determinations per hour. Accuracy was assessed by applying the procedure to distilled spirits of sugarcane and grape already analyzed by HPLC; in addition, recoveries within 96 and 120% were obtained.
authors.affiliation: Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Box 96, Piracicaba SP 13400-970, Brazil.
authors.forename: Ana Paula G
authors.initials: AP
authors.lastname: Gervasio
authors.forename: Eduardo P
authors.initials: EP
authors.lastname: Borges
authors.forename: Elias A G
authors.initials: EA
authors.lastname: Zagatto
authors.forename: Boaventura F
authors.initials: BF
authors.lastname: Reis
authors.forename: Rui A S
authors.initials: RA
authors.lastname: Lapa
authors.forename: José L F C
authors.initials: JL
authors.lastname: Lima
mesh_terms: D000434:Alcoholic Beverages / Q000032:analysis*; D000431:Ethanol / Q000737:chemistry*; D017022:Flow Injection Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis; D005990:Glycerol / Q000032:analysis*; D011199:Potentiometry; D012680:Sensitivity and Specificity
chemical_list: D000431:Ethanol; D005990:Glycerol