| dc.description.abstract | Hydrocolloid flour extracted of gembili tuber studied in this research to know the chemical and technical functional
properties. Hydrocolloid flour extracted directly with distilled water (HFC) and hydrocolloid flour which has reduced protein
(deproteinase) by hydrolysis with 0.05% protease of Aspergillus oryzae (HFD). Compared to the chemical properties and technical
functional properties covering proximate test, total sugars, solubility, power and emulsion stability, power and foaming stability,
water holding capacity (WHC), oil holding capacity (OHC), viscosity to changes in temperature and viscosity to changes in pH. The
results showed that different test t-test (α = 0.05) moisture content, ash content and fat content between HFC and HFD not significant,
while the levels of protein and carbohydrates are significant. Deproteinase the process of hydrocolloid flour made of gembili tuber
with 0.05% protease enzyme use in the extraction able to lower protein content by 49.57% and increase of carbohydrates by 11.39%.
In addition, the process deproteinase effect the technical functional properties of hydrocolloid flour increase solubility, emulsion
stability, foam stability, WHC and OHC. Increasing in the temperature by 10-90 °C lower the viscosity by 70% (56.33 ± 0.19mp to
17.05 ± 0.03 mp) of HFC and 73% (26.16 ± 1.28 mp to 7 , 08 ± 0.79 mp) of HFD. The highest viscosity hydrocolloids flour (HFC and
HFD) contained at pH 7 and decrease with acidic or alkaline conditions. | en_US |
