Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C
The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption....
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| Format: | Article |
| Language: | English |
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Mendel University Press
2007-01-01
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| Series: | Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis |
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| Online Access: | https://acta.mendelu.cz/55/5/0181/ |
| _version_ | 1818584668160655360 |
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| author | Jiří Štencl |
| author_facet | Jiří Štencl |
| author_sort | Jiří Štencl |
| collection | DOAJ |
| description | The equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption. Isosteric heat of sorption was defined and determined in the temperature range of 10–30 °C. Clausius-Clapeyron equation was used to calculate the isosteric heat of sorption since no dependence on temperature in the analysed range was observed. The isosteric heats of sorption (qnst) were indicated graphic in the form qnst versus moisture content. Values for isosteric heat of sorption ranged from 54.41 to 46.85 kJ/mol. |
| first_indexed | 2024-12-16T08:24:50Z |
| format | Article |
| id | doaj.art-6674d384eef34870ac2fb214911a9e07 |
| institution | Directory Open Access Journal |
| issn | 1211-8516 2464-8310 |
| language | English |
| last_indexed | 2024-12-16T08:24:50Z |
| publishDate | 2007-01-01 |
| publisher | Mendel University Press |
| record_format | Article |
| series | Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis |
| spelling | doaj.art-6674d384eef34870ac2fb214911a9e072022-12-21T22:38:02ZengMendel University PressActa Universitatis Agriculturae et Silviculturae Mendelianae Brunensis1211-85162464-83102007-01-0155518118610.11118/actaun200755050181Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °CJiří Štencl0Ústav zemědělské, potravinářské a environmentální techniky, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republikaThe equilibrium moisture contents of parsley leaves were measured by the gravimetric dynamic method with continuous recording of changes in sample weight. Consequently water activity values were determined. Henderson equation was found to be a good model both for moisture adsorption and desorption. Isosteric heat of sorption was defined and determined in the temperature range of 10–30 °C. Clausius-Clapeyron equation was used to calculate the isosteric heat of sorption since no dependence on temperature in the analysed range was observed. The isosteric heats of sorption (qnst) were indicated graphic in the form qnst versus moisture content. Values for isosteric heat of sorption ranged from 54.41 to 46.85 kJ/mol.https://acta.mendelu.cz/55/5/0181/moisture contentClausius-Clapeyron equationHenderson modelisosteric heat of sorption |
| spellingShingle | Jiří Štencl Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis moisture content Clausius-Clapeyron equation Henderson model isosteric heat of sorption |
| title | Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C |
| title_full | Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C |
| title_fullStr | Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C |
| title_full_unstemmed | Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C |
| title_short | Effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10–30 °C |
| title_sort | effect of temperature and water activity on heat transfer in parsley leaves in the range of temperatures 10 30 °c |
| topic | moisture content Clausius-Clapeyron equation Henderson model isosteric heat of sorption |
| url | https://acta.mendelu.cz/55/5/0181/ |
| work_keys_str_mv | AT jiristencl effectoftemperatureandwateractivityonheattransferinparsleyleavesintherangeoftemperatures1030c |