Which plasticizer is suitable for films based on babassu starch isolated by different methods?

Author(s)

Maniglia, Bianca C. ^[1] ; Tessaro, Larissa ^[1] ; Ramos, Ana Paula ^[1] ; Tapia-Blacido, Delia R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, Bandeirantes Ave 3900, BR-14040901 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: FOOD HYDROCOLLOIDS; v. 89, p. 143-152, APR 2019.
• Web of Science Citations: 8

Abstract

This work aimed to determine which plasticizer is suitable for films based on babassu starch isolated by steeping in water (WS), acid steeping (AS), or alkaline steeping (KS) with a view to obtaining less hydrophilic films with good mechanical properties. We used glycerol, sorbitol, glucose, or urea as plasticizers and determined the resulting film physical and functional properties. Plasticizer type did not affect film color or antioxidant activity, but it impacted film opacity and physical and functional properties. As verified by FTIR and SEM, the babassu starches presented different chemical composition and structure, so plasticizers affected AS, WS, and KS starch film properties differently. Glycerol and urea yielded more hydrophilic, more permeable to water vapor, less opaque, less mechanically resistant, and less crystalline AS and KS starch films. Meanwhile, WS starch films showed this behavior when sorbitol or glucose was used as plasticizer. Glucose provided films that were less permeable to water vapor regardless of starch type. With respect to application in food packaging, sorbitol was the most suitable plasticizer for AS and KS starch films, whereas glycerol was the most adequate plasticizer for WS starch film. (AU)

• FAPESP's process: 09/14610-0 - Use of agro-industrial residues in the elaboration of bioactive films
• Grantee: Delia Rita Tapia Blácido
• Support Opportunities: Research Grants - Young Investigators Grants