Abstract: Breadfruit starch is
a unique resource which benefits for raw material of adhesive making. This study
investigates hydrolysis method of breadfruit starch into dextrin with Sulphate
Acid (H2SO4) catalysator. Dextrin hydrolysis is carry out
in order to produce high dextrin percentage by subtracting the total glucose
with free glucose. This study evaluates composition change because of
breadfruit starch in various time and temperature. Optimum dextrin percentage
is obtained at hydrolysis temperature of 100oC, hydrolysis time 10 minutes,
and 0.5 N H2SO4 concentration, with dextrin percentage of
77.12%. Furthermore, dextrin obtained is added by casein, cold water,
triethanolamine, and water in order to form adhesive. The reserch result showed
that the shear strength of the dextrin glue is 14 kg/cm2which is
larger than that of glue of Fox brands sold in the market that is only 12.48
kg/cm2. Because there is previous study regarding starch hydrolysis
from breadfruit by using chloride acid catalysator, then data in this research
show the influence of the sulphate acid usage as catalysator of adhesive. Based
on the comparison, it seems that for breadfruit starch hydrolyzed at 100oC
for 10 minutes, dextrin produced is less than that obtained by using chloride
acid catalysator. The less dextrin percentage from breadfruit starch is caused
by not all hydro sulphate ions are dissociated while mixing with starch. The
mass balance is necessary to be completed including analysis of the breadfruit
starch composition after hydrolysis to determine whether the starch has been
degraded or not.
Keywords: adhesive, dextrin,
hydrolysis, shear strength
Penulis: Mirna Rahmah Lubis
Kode Jurnal: jpkimiadd120031
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