Automatic determination of reducing sugars by atomic absorption spectrometry

✍ Scribed by M.C. Yebra; M. Gallego; M. Valcárcel

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 625 KB
• Volume: 276
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80409-e

✦ Synopsis

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 lo-110 pg ml-' with a relative standard deviation of 2.7% at 50 pg glucose ml-' (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.