Effect of Heating on Tensile Strength and Elongation at Break of Bioplastic from Taro Starch Filled Chitosan (Colocasia esculenta) with Glycerol Plasticizer

M.H.S. Ginting*, R. Hasibuan, M. Lubis, T.P. Sirait and T. Sidabudar

Department of Chemical Engineering, Universitas Sumatera Utara, Jalan Almamater, Medan 20155, Indonesia

*Corresponding author: E-mail: hendra.ginting@usu.ac.id

Abstract

Taro starch is a potential raw material for bioplastics by adding glycerol and chitosan. The casting method is used for making bioplastics with 30%w/v starch solution. Moreover, the variation added volume of glycerol (1%, 2% and 3% v/v), addition of chitosan (1% w/v, 2%w/v and 3%w/v) and pasting temperature was 75 ºC. Taro starch with particle size 100 mesh has 93.55% starch, 17.9% amylose, 75.66% amylopectin. Analysis of plastice properties showed that taro starch has a gelatinization temperature of 74.52 ºC with high peak viscosity 5953.5 cP. FTIR analysis show bands due to presence of O-H, C-H, C=H, C-O-H and C-O. The best of bioplastic in this study was 30% w/v on starch, 1% v/v glycerol and 2% w/v chitosan at 75 ºC produces 42.86% water absorption, 8.297 MPa tensile strength and elongation at break was 45.846%.

Keywords

Starch, Taro, Bioplastic, Glycerol, Chitosan.

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