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Os objetivos deste trabalho foram estudar o processo de secagem solar do coentro, com e sem branqueamento, e avaliar os efeitos destes sobre as caracteristicas fisico-quimicas do material desidratado. As amostras de coentro, foram submetidas ao branqueamento por imersao direta em agua (BID) e branqueamento por imersao em saco (BIS). As amostras desidratadas, com e sem branqueamento, foram caracterizadas quanto a acidez total titulavel e teor de acido ascorbico. No tocante aos resultados referentes ao processo de secagem, constatou-se que nao houve modificacao significativa na velocidade de secagem das amostras com e sem branqueamento. Dentre os tres modelos matematicos utilizados para representar o comportamento das curvas de secagem, o modelo Midilli e Kucuk foi o melhor descreveu o comportamento das curvas, com R 2 acima de 99% e menor desvio quadratico medio. Com relacao ao produto desidratado, verificou-se que as amostras submetidas ao branqueamento BIS, apresentaram menor reducao no teor de acido ascorbico, cerca de 40%, em relacao a amostra original.  Sun drying of coriander: effect of pretreatments and process on physical-chemical aspects ABSTRACT: The aim of this study were evaluate the sun drying process of coriander leaves, blanchied and unblanched, and assess the effect of pretreatments on physico-chemical aspects of dehydrated material. Coriander leaves were blanched by direct water imersion and blanched by imersion in polyethylene bag. Dehydrated samples, blanched and unblanched, were characterized by means total titratable acidity (TTA) and ascorbic acid content (AA). According to the results of drying process, it was not observed siginifcant changes in the drying rate of blanched and unblanched samples. Among the mathematical models applied to describe the drying process, Midilli and kucuk model, was the best model to describe the drying curves behavior, with R 2 above 99% and the lowest mean square deviation. Blanched samples in polyethylene bag, showed TTA and AA values near the fresh samples.

Secagem solar de coentro: efeito de pré-tratamentos e do processo sobre, os aspectos físicos-químicos