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Web End = J Polym Environ (2015) 23:534540 DOI 10.1007/s10924-015-0722-y
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Web End = Hard Biodegradable Biopolymer Obtained from Whey Protein Concentrate and Montmorillonite
M. Kawecka-Radomska1 M. Tomczyska-Mleko2 M. Wesoowska-Trojanowska3
K. Kowalczyk2 M. Chrzastek2 S. Mleko4
Published online: 12 April 2015 The Author(s) 2015. This article is published with open access at Springerlink.com
Abstract The aim of this study was to obtain whey protein concentrateWPC/montmorilloniteMON biopolymers. Mixed whey protein/montmorillonite biopolymers were formed as heat-induced gels and hardened by water evaporation. Increase in protein concentration caused an increase in storage and loss moduli of the gels. Adding 5 % of MON to whey protein gel matrix caused an increase in the moduli value. Obtained biopolymers behaved as weak physical gels as loss tangent was in a range 0.250.45. Increase in protein concentration and addition of MON caused increase
in viscosity of the biopolymers measured by dissipation of ultrasound vibrations. Addition of MON generally caused reinforcement of the structure of the mixed gels and the material was more resistant to puncture. Addition of MON caused changes in the microstructure of whey protein gel, which became more ne-stranded. It was probably caused by adsorption of the ions by MON. Drying of WPC/MON gels caused formation of very hard biopolymer, which can be applied as natural biodegradable material.
Keywords Biodegradable Biopolymer
Montmorillonite Rheology Whey protein
Introduction
Synthetic polymers production is one of the leading industry in the world. Growing environmental concern causes increased interest in development of new biopolymers based on proteins, carbohydrates and lipids obtained from natural or agricultural sources. Additional value is added to biopolymers produced from agricultural and food industry by-products. Bioplastics from protein feedstock used as packaging, agriculture, horticulture and medical materials may have signicant advantages over synthetic plastics [1]. Fast biodegradation ratio is the main advantage in production of natural biopolymers. Whey protein isolate lms buried in a compost pile began to degrade in 2 days and more than 80 % of total solids were lost in 7 days [2]. Because of their large potential for agricultural, industrial and...