The
Malaysian Journal of Analytical Sciences Vol 16 No 2 (2012): 325 – 334
APPLICATION OF
PALM
STEARIN- CHITOSAN EDIBLE COATING ON STAR FRUITS (Averrhoa carambola L.)
(Aplikasi Penyalutan Stearin-Chitosan ke atas Belimbing (Averrhoa carambola L.))
Nurul Hanani Mohamad Zaki, Halimahton Zahrah Mohamed
Som* , Zaibunnisa Abdul Haiyee
Faculty of Applied Sciences,
Universiti Teknologi MARA 40450 Shah Alam, Selangor,
Malaysia
*Corresponding author: halimah@salam.uitm.edu.my
Abstract
An
edible coating comprising of hydrophilic (chitosan) and hydrophobic (palm
stearin) components which demonstrated gas barrier and moisture barrier
properties respectively, was developed to prolong the postharvest life of star
fruits (Averrhoa carambola L.). The
physicochemical properties of the coated star fruits were evaluated in terms of
weight loss, firmness, visual appearance, colour and glossiness, respiratory
gases (oxygen and carbon dioxide) concentrations and ethylene concentration
during storage at chilled temperature for 40 days. The results obtained showed
that coating reduced weight loss, and maintained firmness and appearance of star
fruits. Formulation 1:1 (chitosan:stearin)
prevented decline in oxygen production, slowed down carbon dioxide production,
and maintained firmness of star fruits. Visual appearance of star fruits showed
that coating had lengthened the post harvest life of star fruits up to 40 days
with no sign of mould growth.
Keywords: Edible coating; chitosan; palm stearin;
emulsion; physicochemical properties
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