1. Metal complexed-enzymatic hydrolyzed chitosan improves moisture retention of fiber papers by migrating immobilized water to bound state
- Author
-
Chao Lin, Xuejiao Wang, Shuqin Xia, Khizar Hayat, Huijuan Wang, Muhammad Tahir, Shahzad Hussain, Heping Cui, and Xiaoming Zhang
- Subjects
Paper ,Polymers and Plastics ,Water activity ,Chemical structure ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Polyvinyl alcohol ,law.invention ,Humectant ,Chitosan ,chemistry.chemical_compound ,Hydrolysis ,Magazine ,Cellulase ,law ,Papain ,Materials Chemistry ,Organometallic Compounds ,Organic Chemistry ,Water ,021001 nanoscience & nanotechnology ,nervous system diseases ,0104 chemical sciences ,Molecular Weight ,Polygalacturonase ,chemistry ,Wettability ,Molar mass distribution ,0210 nano-technology ,Hydrophobic and Hydrophilic Interactions ,Nuclear chemistry - Abstract
To obtain chitosan (CTS) with narrower molecular weight distribution, CTS with weight-average molecular weight (MW) of 197.30 kDa was first metal complexed and then degraded into five CTSs with MW of 107.90, 56.48, 10.40, 5.67 (CTS-4) and 3.66 kDa. Decrease of MW did not cause a significant change in chemical structure of the residue CTS, but the crystal structure was transformed significantly. The moisture retention increased firstly and then decreased as the MW of CTS decreased. CTS-4 was superior to CTSs with other MW and propylene glycol in terms of the moisture retention. The lower water activity and increase of net isosteric heat were observed in CTS-4, which was due to the migration of immobilized water to a bound-state caused by mounting newly formed chain-end hydrophilic groups per unit weight. CTS-4 could effectively improve moisture retention, showing a potential to substitute commonly used humectant such as propylene glycol.
- Published
- 2019