Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling
Moisture sorption properties of whole date-pits (WDP) and three fractionated date-pits; defatted date-pits (DDP), residue (REP) and supernatant (SUP) fractions were studied. Sorption isotherms were measured using Differential Thermal and Humidity chamber at different temperatures (10, 30, 50, 70 and...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-05-01
|
| Series: | Arabian Journal of Chemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535223001405 |
| _version_ | 1797857665463877632 |
|---|---|
| author | Maha Al-Khalili Nasser Al-Habsi Mohammad Rahman |
| author_facet | Maha Al-Khalili Nasser Al-Habsi Mohammad Rahman |
| author_sort | Maha Al-Khalili |
| collection | DOAJ |
| description | Moisture sorption properties of whole date-pits (WDP) and three fractionated date-pits; defatted date-pits (DDP), residue (REP) and supernatant (SUP) fractions were studied. Sorption isotherms were measured using Differential Thermal and Humidity chamber at different temperatures (10, 30, 50, 70 and 90 °C) and relative humidity ranged from 0.05 to 0.9. Crossovers of isotherm curves were observed for all fractions between different temperatures. At 30 °C, BET-monolayers of WDP, DDP, REP and SUP were 4.9, 4.2, 3.8 and 3.2 g/100 g ds, respectively. The complete isotherms (i.e. 0.05–0.90 water activity) were modelled by GAB with high coefficient of determination (i.e. 0.944 to 0.999). In the cases of WDP and DDP, the isosteric heat plots showed increasing trends with the decreased moisture and peaks at moisture 0.025 and 0.040 g/100 g ds. Unlike all fractions, DDP isokinetic temperatures Tis (i.e. 97.4 °C) was lower than isobound temperatures Tib (i.e. 145.0 °C) indicating complete removal of bound water occurred at higher temperature as compared to the temperature when all reactions reached at the same. The moisture sorption isotherm characteristics could be used in determining the end point of drying and storage stability as well as packaging design of the date-pits and their fractions. |
| first_indexed | 2024-04-09T21:00:27Z |
| format | Article |
| id | doaj.art-18ce6274493242cabe7662b5f47b59d7 |
| institution | Directory Open Access Journal |
| issn | 1878-5352 |
| language | English |
| last_indexed | 2024-04-09T21:00:27Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj.art-18ce6274493242cabe7662b5f47b59d72023-03-29T09:25:47ZengElsevierArabian Journal of Chemistry1878-53522023-05-01165104678Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modellingMaha Al-Khalili0Nasser Al-Habsi1Mohammad Rahman2Department of Food Science and Nutrition, College of Agricultural and Marine Sciences, Sultan Qaboos University, P. O. Box 34-123, Al-Khod 123, OmanCorresponding author.; Department of Food Science and Nutrition, College of Agricultural and Marine Sciences, Sultan Qaboos University, P. O. Box 34-123, Al-Khod 123, OmanDepartment of Food Science and Nutrition, College of Agricultural and Marine Sciences, Sultan Qaboos University, P. O. Box 34-123, Al-Khod 123, OmanMoisture sorption properties of whole date-pits (WDP) and three fractionated date-pits; defatted date-pits (DDP), residue (REP) and supernatant (SUP) fractions were studied. Sorption isotherms were measured using Differential Thermal and Humidity chamber at different temperatures (10, 30, 50, 70 and 90 °C) and relative humidity ranged from 0.05 to 0.9. Crossovers of isotherm curves were observed for all fractions between different temperatures. At 30 °C, BET-monolayers of WDP, DDP, REP and SUP were 4.9, 4.2, 3.8 and 3.2 g/100 g ds, respectively. The complete isotherms (i.e. 0.05–0.90 water activity) were modelled by GAB with high coefficient of determination (i.e. 0.944 to 0.999). In the cases of WDP and DDP, the isosteric heat plots showed increasing trends with the decreased moisture and peaks at moisture 0.025 and 0.040 g/100 g ds. Unlike all fractions, DDP isokinetic temperatures Tis (i.e. 97.4 °C) was lower than isobound temperatures Tib (i.e. 145.0 °C) indicating complete removal of bound water occurred at higher temperature as compared to the temperature when all reactions reached at the same. The moisture sorption isotherm characteristics could be used in determining the end point of drying and storage stability as well as packaging design of the date-pits and their fractions.http://www.sciencedirect.com/science/article/pii/S1878535223001405Date-pitsWater activityBET modelGAB modelIsosteric heatIsokinetic temperature |
| spellingShingle | Maha Al-Khalili Nasser Al-Habsi Mohammad Rahman Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling Arabian Journal of Chemistry Date-pits Water activity BET model GAB model Isosteric heat Isokinetic temperature |
| title | Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling |
| title_full | Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling |
| title_fullStr | Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling |
| title_full_unstemmed | Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling |
| title_short | Moisture sorption isotherms of whole and fractionated date-pits: Measurement and theoretical modelling |
| title_sort | moisture sorption isotherms of whole and fractionated date pits measurement and theoretical modelling |
| topic | Date-pits Water activity BET model GAB model Isosteric heat Isokinetic temperature |
| url | http://www.sciencedirect.com/science/article/pii/S1878535223001405 |
| work_keys_str_mv | AT mahaalkhalili moisturesorptionisothermsofwholeandfractionateddatepitsmeasurementandtheoreticalmodelling AT nasseralhabsi moisturesorptionisothermsofwholeandfractionateddatepitsmeasurementandtheoreticalmodelling AT mohammadrahman moisturesorptionisothermsofwholeandfractionateddatepitsmeasurementandtheoreticalmodelling |