Citation
Mohamad, Naemaa
(2014)
Optimization of processing parameters and accelerated shelf life of kerisik.
Masters thesis, Universiti Putra Malaysia.
Abstract
The study was conducted since there is no information about optimization of kerisik
(roasted coconut paste) processing parameters and accelerated shelf life study of the
optimized processing parameters of kerisik to date. Therefore, the objectives of the
study were to use response surface methodology (RSM) to optimize roasting
temperature and roasting time to produce kerisik and consequently to use accelerated
shelf life study to determine the shelf life of the kerisik. The optimization of kerisik
processing parameters such as roasting temperature (130-150 °C) and roasting time
(210-240 minutes) was achieved by using central composite design (CCD) via
Design Expert software. Responses measured were color (L and b values) and furan
compound (measured at 280 and 290 nm). Subsequently, the kerisik were packed in
nylon and polypropylene packaging films and then were stored at two storage
temperatures namely 38 °C for 38 days and 48 °C for 30 days for each type of
packaging film. The analyses for accelerated shelf life study included moisture
content (%), total color different (TCDH), peroxide value (PV) (meq kg-1), acid value
and p-anisidine value. Accelerated shelf life study employed PV as it main parameter
in shelf life estimation with PV of 10 meq per kg fat was considered as the threshold
limit for oxidative rancidity. Result showed that the optimum processing conditions
for kerisik (laboratory scale) by using oven were found to be 130 °C (roasting
temperature) for 227 minutes (roasting time). Predicted value of responses (color and
furan) obtained using model equations were in good agreement with the experimental
values. L (lightness), b (yellowness) and furan measured at 280 and 290 nm were
significantly affected by the processing parameters. Finally, the shelf life of kerisik
in nylon packaging film was predicted to be 46-49 days and 41-43 days for kerisik in
polypropylene film. Kerisik producers may consider the generated optimized
processing parameters and accelerated shelf life information from this study for
kerisik product development in order to find the best method to replace the
conventional way of kerisik production.
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