Abstract

SASKA, Michael; FIGUEROA, Edgardo A.; ZOSSI, B. Silvia  and  RUIZ, R. Marcelo. Determination of reducing sugars in raw sugar by the method of Luff-Schoorl. Rev. ind. agric. Tucumán [online]. 2022, vol.99, n.1, pp.61-64. ISSN 1851-3018.

Two ICUMSA methods were compared for determination of reducing sugars in cane raw sugar, viz. the Luff-Schoorl  Official and Lane-Eynon  Accepted methods. The former one was validated on a limited number of samples in terms of repeatability and recovery. The two methods produced statistically identical results, although in the 0,1 to 1,0 % reducing sugar range the Luff-Schoorl numbers were 14% higher than those by the Lane Eynon method. The reducing sugar recovery in the Luff Schoorl procedure was on average 106 %. A modification of the standardization procedure was proposed to correct for this apparent bias in the ICUMSA GS1-5 procedure. With this modification, in the 0.1 - 1.0 % range, the Luff Schoorl numbers were only 8 % higher than those obtained by the Lane Eynon method.

Keywords : raw sugar; reducing sugar; Luff-Schoorl.

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