Effects of temperature and water activity on the sorption heat of whey and yoghurt powder spray within the temperature range 20-40C

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F10%3A00169006" target="_blank" >RIV/62156489:43210/10:00169006 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Effects of temperature and water activity on the sorption heat of whey and yoghurt powder spray within the temperature range 20-40C

Original language description

Moisture sorption isotherms of whey and yoghurt powder spray in the temperature range of 20 40oC and water activity from 0.4 to 0.99 were determined using gravimetric method. Five sorption models were evaluated. The Henderson's and Chung Pfost's equationgave the best fit for sorption data of whey and yoghurt powder spray, respectively. The isosteric heat of sorption was defined and then calculated using corresponding sorption model and Clausius Clapeyron equation. An exponential function fitted the experimental heat of sorption values at various moisture contents for both milk powder products. The curves on diagrams show that the sorption heat decreases when the moisture content is increased. Calculated values decreased from 47.03 kJ/mol and 46.37 kJ/mol for whey and yoghurt powder spray, respectively, to the values approaching the heat of vaporization of pure water. Values of the heat of desorption were higher than those of adsorption; the difference increases with the moisture conte

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

GM - Food industry

OECD FORD branch

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Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2010

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Food Process Engineering

ISSN

0145-8876

e-ISSN

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Volume of the periodical

33

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

16

Pages from-to

946-961

UT code for WoS article

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EID of the result in the Scopus database

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