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Water Adsorption of Peanut Kernels in a Closed System with Respect to Moisture Transfer
Author(s) -
CHIOU R. Y. Y.
Publication year - 1987
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1987.tb14288.x
Subject(s) - hygrometer , adsorption , moisture , chemistry , distilled water , water vapor , analytical chemistry (journal) , thermodynamics , chromatography , humidity , organic chemistry , physics
Adsorption isotherms of peanut kernels, Tainan # 9 and #11, were determined at 30°C and used as reference to determine the a w at equilibrium. The changes of the apparent a w and moisture of three weighed dried kernels in closed systems stored with distilled water were determined in an electric hygrometer and a series of vessels at 30°C. A nonequilibrium state of moisture and apparent a w gradients of the kernels was observed in the early stages of 144 hr storage. In a 90 min experiment with the hygrometer at 30°C, the vapor adsorption rate and final apparent a w decreased in order with the increase of the number of kernels, from 1 to 7, stored with saturated K 2 Cr 2 O 7 salt (a w = 0.98 at 30°C). Vapor adsorption rate and final apparent a w of Tainan # 9 were slightly higher than those of # 11.