NDLI: Open sun drying of green bean: influence of pretreatments on drying kinetics, colour and rehydration capacity

Content Provider	Springer Nature Link
Author	İsmail, Osman Kantürk Figen, Aysel Pişkin, Sabriye
Copyright Year	2016
Abstract	Green bean (Phaseolus Vulgaris L), classified under legume family, is a primary source of dietary protein in human diets especially in the agricultural countries. Green bean is susceptible to rapid deterioration because of their high moisture content and in order to prevent and present the green bean drying process is applied. In this study, effects of pretreatments on drying kinetics, colour and rehydration capacity of green bean were investigated. It was observed that the pretreatment affected the drying time. The shortest drying times were obtained from pretreated samples with blanched. Drying times were determined as 47, 41 and 29 h for natural, salted and blanch, respectively. The results showed that pretreatment and ambient temperature significantly (P = 0.05) affected the drying rate and the drying time. The effective moisture diffusivity was determined by using Fick’s second law and was found to be range between 3.15 × 10−10 and 1.2 × 10−10 m2/s for the pre-treated and natural green bean samples. The rehydration values were obtained 2.75, 2.71, 2.29 (g water/g dry matter) for the blanched, salted and natural samples. The effective diffusion coefficients were calculated using the data collected during the falling rate period and the experimental data are fitted to seven thin layer drying models which found in the literature. The Logarithmic model was found to best describe the drying behavior of fresh green beans under open air sun. Rehydration time and color parameters had been determined in order to improve the quality of dried green bean. Regarding with rehydration time and colour data, the best results were obtained at blanched drying conditions.
Starting Page	1277
Ending Page	1288
Page Count	12
File Format	PDF
ISSN	09477411
Journal	Heat and Mass Transfer
Volume Number	53
Issue Number	4
e-ISSN	14321181
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-08-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Thermodynamics, Heat and Mass Transfer Industrial Chemistry/Chemical Engineering Thermodynamics
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Condensed Matter Physics

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