期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 265, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.120396
关键词
Aquaphotomics; near infrared spectroscopy (NIR); Chemometrics; Water activity; rice germ; storage
类别
资金
- Japanese Society for Promotion of Science [P17406]
- Universita degli Studi di Genova [CUP: D34G20000100005]
The study explores the relationship between water activity and water molecular structure, finding that water activity governs the state of rice germ during storage, with water structure described solely through absorbance spectral pattern.
Water activity is an important phenomenon not yet explained in terms of water molecular structure. This paper aims to find the relationship between the water activity and water molecular structure of the rice germ, based on its spectral pattern which can be measured using non-destructive technology. Aquaphotomics near-infrared spectroscopy was used to study rice germ stored at different levels of water activity and atmosphere. The findings show that state of the rice germ is governed by the water activity upon storage, which is defined by the structure of water within germ matrix. The structure of water can be described solely by the absorbance spectral pattern at the following absorbance bands: proton hydrates, hydration shells and water vapor (1364, 1375 and 1382 nm), trapped water (1392 nm), free water (1410 nm), hydration water (1425 nm), adsorbed water (1455 nm), non-bonded hydroxyl (1436 nm) and bound water (1520 nm). (c) 2021 Elsevier B.V. All rights reserved.
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