Page 206 - Proceeding The 2nd International Seminar of Science and Technology : Accelerating Sustainable Innovation Towards Society 5.0

nd
The 2 International Seminar of Science and Technology
“Accelerating Sustainable innovation towards Society 5.0”
ISST 2022 FST UT 2022
Universitas Terbuka
the muscle was chopped and finally ground with a blender for
homogenous mixture [3].
Biochemical analysis: Proximate composition: AOAC method was
followed for proximate composition of the fresh and frozen prawn.
Moisture: The loss of moisture was calculated with the Equation (1).
ℎ − ℎ
Moisture content (%) = (1)
ℎ
(100)
Detection of unwanted materials: Collected tissues were weighed by
electronic balance and 5 ml of diacid mixture (5 ml conc. HNO3: 3 ml
60% HClO4) were added to each sample. The content mixed for
overnight. Samples were then digested, initially at 80°C and later at
150°C for 2 hours. The completion of digestion was indicated by
almost colorless material. The samples were analyzed using the
Atomic Absorption Spectrophotometer method of Clesceri et al. The
Equation (2) calculated the concentration of heavy metal.
Metal concentration = (2)
( )

ℎ
3 RESULTS
Change in physical characteristics during fresh and frozen storage:
Table. 1 shows the change in organoleptic qualities on prawn
(Macrobrachiumrosenbergii) during frozen storage at -20°C. It was
organoleptically in acceptable condition for 8 weeks. During
observation up to 4th weeks it was in excellent condition with natural
odour and flavour. The characteristics of bright appearance, soft and
firm texture also present. During 8th week of observation there was
little deterioration apart from some loss of natural odour and still the
off flavour was not introduced. During 12th weeks of observation there
was loss of bright appearance, loss of natural odour, the loss of natural
flavour was observed, and the experimental agent was in rejected
condition [4]. The quality of prawn was acceptable up to 4 hours in all
case according to organoleptic assessment, but this score gradually
decreases.

ISST 2022 – FST Universitas Terbuka, Indonesia 183
International Seminar of Science and Technology “Accelerating Sustainable
Towards Society 5.0