Resumo O objetivo deste trabalho foi avaliar um método colorimétrico de análise de açúcares redutores (AR) baseado na sua reação com cloreto de trifenil tetrazólio, de rápida execução, que pudesse ser aplicado nas usinas de cana-de-açúcar. Como a pureza do caldo de cana apresenta alta correlação com AR, desenvolveu-se, neste trabalho, uma equação de regressão linear (AR/RJ) que foi comparada com as de São Paulo (AR/SP) e Paraíba (AR/PB). A equação AR/SP, adotada atualmente no Rio de Janeiro, apresentou inclinação muito acentuada em comparação com as demais; isto indica a necessidade de se criar equação própria para cada região produtora de cana-de-açúcar.Termos para indexação: tecnologia do açúcar, indústria açucareira, colorimetria, método de análise. Method for determination of reducing sugar applicable on sugarcane payment systemAbstract This work aimed to evaluate a colorimetric method of reducing sugar (RS) analysis based on its reaction with triphenyl tetrazolium chloride, which is of fast operation and suitable to be applied in the sugarcane mills. As the purity of sugarcane juice presents high correlation with RS, an equation of linear regression (RS/RJ) was developed, and it was compared to other equations developed in São Paulo (RS/SP) and Paraíba (RS/PB). The RS/SP equation, which is currently adopted in Rio de Janeiro, showed a higher downward slope in comparison to the others, indicating the need to create an equation, which is proper to each sugarcane producing region.
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