Strategical development of chrome-free tanning agent by integrating layered double hydroxide with starch derivatives.

Yiming Shen, Jianzhong Ma, Qianqian Fan, Dangge Gao, Han Yao

Journal: Carbohydrate polymers 2023;304():120511

PMID: 36641159

Full Text on Elsevier Science View on PubMed

Abstract

The development of sustainable and eco-friendly leather industry requires green tanning agents because of unbounded chromium (easily converted into hazardous Cr-VI) in chrome tanned leather. In this study, a chrome-free tanning agent (OS-LDHs) was established by integrating layered double hydroxide (magnesium aluminum zirconium hydrotalcite, LDHs) with starch derivatives. A series of oxidized starch (OS) were prepared as masking agents for LDHs tanning process. Among them, the weight-average molecular weight (Mw) of 1685 g/mol could be reached, which will promise the well-distribution of OS. The SEM and EDS analysis confirmed the uniform penetration of OS-LDHs, avoiding accumulation on the surface of crust leather. Notably, leather tanned by OS-LDHs achieved shrinkage temperature of 66.7 °C, porosity of 75.51 % and tear strength of 66.7 N/mm. Not only the hydrogen bond but also the coordination between NH, COOH in collagen and OS-2-LDHs improved the thermal stability of leather without destroying the collagen triple helix.

Address: College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; Xi'an Key Laboratory of Green Chemicals and Functional Materials, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China.; College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; Xi'an Key Laboratory of Green Chemicals and Functional Materials, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China. Electronic address: [email protected].; College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; Xi'an Key Laboratory of Green Chemicals and Functional Materials, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China. Electronic address: [email protected].; National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China; College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi'an 710021, Shaanxi, China.

DOI: 10.1016/j.carbpol.2022.120511

Link outs

Free resources

Medical:

https://medlineplus.gov/tanning.html

Subscription / membership required

Full Text Sources:

https://linkinghub.elsevier.com/retrieve/pii/S0144...

MeSH Terms: Tanning, Starch, Industry, Chromium, Collagen