Automated potentiometric end point determination in the Lane‐Eynon titration of reducing sugars

Abstract

AbstractAn instrumental method which closely matches the Lane‐Eynon titration is evaluated with microcomputer interfacing for determining reducing sugars by titration into boiling Fehling's solution. Titrations using copper or platinum as indicator electrodes for end point detection gave millivolt changes at the end point, varying from 18 to 220 mV depending on the electrode couple used, and relative standard deviations of 0.44–0.67% for the precision of measured end, point volumes. Titration data measured with a copper‐platinum electrode couple are acquired in real time for 58 raw sugar samples with reducing sugar content varying from 0.10 to 0.61%. Linear regression correlation of the potentiometric titration data and the standard Lane‐Eynon method gives a correlation coefficient of 0.9960.