A Novel and Accurate Method for Moisture Adsorption Isotherm Determination of Sultana Raisins

Li, Jun; Dong, Lei; Xiao, Man; Qiao, Dongling; Wu, Kao; Jiang, Fatang; Riffa, Saffa B.; Su, Yuehong

Abstract

A novel method (dynamic water transfer–based water activity analyzer (DWT) method) based on Fick’s law of diffusion for the accurate measurement of moisture sorption isotherm (MSI) has been developed and was compared with saturated salt solutions (SSS) method and dynamic vapor sorption (DVS) method. MSIs at 25 °C of sultana raisins obtained by the three methods were analyzed and compared, and four adsorption models (BET, Halsey, GAB, and Peleg) were used to fit the results. The MSI curves obtained by the three methods all showed the similar type III isotherm characteristic, but equilibrium moisture content at the same relative humidity (RH) showed some differences, and the repeatability and accuracy were different. Generally, results obtained by the SSS method may have relatively low accuracy due to the relatively high measurement error; results obtained by the DVS method may lack representativeness due to the small sample size; results obtained by the DWT method may have high representativeness and accuracy at the same time. The fitting results of adsorption models indicated that MSI results obtained by the DWT method had the highest fitting degree with the Peleg model. This study may contribute to deepened understandings on MSI measurement of semi-dried foods.

Citation

Li, J., Dong, L., Xiao, M., Qiao, D., Wu, K., Jiang, F., …Su, Y. (2019). A Novel and Accurate Method for Moisture Adsorption Isotherm Determination of Sultana Raisins. Food Analytical Methods, 12(11), 2491-2499. https://doi.org/10.1007/s12161-019-01599-0

• Journal Article Type: Article
• Acceptance Date: Jul 10, 2019
• Online Publication Date: Jul 20, 2019
• Publication Date: 2019-11
• Deposit Date: Nov 9, 2020
• Publicly Available Date: Nov 24, 2020
• Journal: Food Analytical Methods
• Print ISSN: 1936-9751
• Electronic ISSN: 1936-976X
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 12
• Issue: 11
• Pages: 2491-2499
• DOI: https://doi.org/10.1007/s12161-019-01599-0
• Keywords: Food Science; Analytical Chemistry; Applied Microbiology and Biotechnology; Safety Research; Safety, Risk, Reliability and Quality
• Public URL: https://nottingham-repository.worktribe.com/output/5030959
• Publisher URL: https://link.springer.com/article/10.1007/s12161-019-01599-0
• Additional Information: Received: 8 April 2019; Accepted: 10 July 2019; First Online: 20 July 2019; : ; : Jun Li declares that she has no conflict of interest. Lei Dong declares that he has no conflict of interest. Man Xiao declares that he has no conflict of interest. Dongling Qiao declares that she has no conflict of interest. Kao Wu declares that he has no conflict of interest. Fatang Jiang declares that he has no conflict of interest. Saffa B. Riffa declares that he has no conflict of interest. Yuehong Su declares that he has no conflict of interest.; : This article does not contain any studies with human participants or animals performed by any of the authors.; : Not applicable.; ; This is a post-peer-review, pre-copyedit version of an article published in Food Analytical Methods. The final authenticated version is available online at: http://dx.doi.org/10.1007/s12161-019-01599-0