| dc.description.abstract | Bioplastics are plastics based on biological or often referred to a plastic made
from renewable resources and can be recycled by biological processes. Starch
from the tubers of taro (Colocasia esculenta) is used as a raw material for the
bioplastic using sorbitol as plastizicer and chitosan as a filler. This study aims to
determine the characteristics and profile of taro starch gelatinization, determine
the effect of chitosan and sorbitol to the properties of tensile strength, elongation
at break, water absorption and gelatinization profile bioplastics from taro starch.
This study uses a casting method in the manufacture of bioplastics with
gelatinization temperature 75 oC and a variety starch concentration of 20 % w/v,
30% w/v and 40% w/v. Furthermore, the variation of the addition of sorbitol (10
% w/w, 20 % w/w, 30 % w/w, 40 % w/w and 50 % w/w), and the variation of
addition of chitosan (0.5 w/v ; 1 w/v, 1.5 w/v; 2 w/v; and 2.5 w/v). The results
showed that taro starch with a particle size of 100 mesh have 93.55 % starch
content, 6.5 % moisture content, 0.76 % ash content, 17.9 % amylose, 75.66 %
amylopectin, 1.02 % protein, and 1.44% fat. Analysis of the nature of the pasta
with the method of Rapid Visco Analyzer (RVA) showed starch taro has a
temperature of gelatinization 72.94 °C with peak viscosity 6632 cP, while the taro
starch bioplastics have temperature of gelatinization 77.72 °C with a peak
viscosity 3476 cP. From the analysis of FT-IR obtained a change of functional
groups of O-H of bioplastics at wave number 3765 cm-1
, from the analysis of the
morphology of fracture bioplastics obtained that the spread of filler chitosan is
uneven and there are still some factions empty. Addition of chitosan and sorbitol
affect the properties of tensile strength and elongation at break of bioplastics
produced. By increasing variation chitosan increased the value of tensile strength,
by increasing variation of sorbitol, the value of the elongation at break increases.
The best bioplastics produced on this research is on the composition of starch 40
% w/v with chitosan 2.5 w/v, and sorbitol 30 % w/w which has a value of 8.36
MPa tensile strength and elongation at break value of 22.06%. | en_US |
