Automatic determination of reducing sugars by atomic absorption spectrometry

• Published in: Analytica chimica acta Vol. 276; no. 2; pp. 385 - 391
• Main Authors: Yebra, M.C., Gallego, M., Valcárcel, M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.04.1993; Elsevier
• Subjects: Atomic absorption spectrometry; Biological and medical sciences; Fermented food industries; Flow injection; Food industries; Fundamental and applied biological sciences. Psychology; Sugars; Wines; Wines and vinegars; Wines; Sugars; Atomic absorption spectrometry; Flow injection; Wine; Sugar; Quality control; Analytical method
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/0003-2670(93)80409-E

A continuous precipitation system for the indirect determination of reducing sugars in various types of wine based on the classical reaction with Fehling's solutions is reported. Copper(I) oxide is precipitated by injecting the Fehling's solutions into the wine carrier, which is directly aspirated. This allows reducing sugars to be determined in the range 10–110 μg ml −1 with a relative standard deviation of 2.7% at 50 μg glucose ml −1 ( n=11). The proposed method requires no sample pretreatment. The results obtained in the analysis of six white and red wines were critically compared with those provided by the standard manual method.