This document presents a comparative study of the water, mineral, and biochemical content of three common edible shellfish varieties found in South Kerala: white prawn, mud crab, and clam. The study aimed to determine the moisture content, total ash content, acid insoluble ash, calcium, and magnesium content of each variety. The results showed that all three varieties contained high moisture levels between 75-85%, with white prawn having the highest at 83.85%. Mud crab had the highest total ash and acid insoluble ash, indicating higher mineral content. White prawn and mud crab both had higher calcium and magnesium levels than clam. The study concludes that all shellfish varieties provide good nutrient value and
Unlocking the Potential: Deep dive into ocean of Ceramic Magnets.pptx
A COMPARATIVE STUDY OF WATER AND MINERAL CONTENT OF EDIBLE SHELL FISH VARIETIES COMMONLY FOUND IN SOUTH KERALA
1. A COMPARATIVE STUDY OF WATER AND
MINERAL CONTENT OF EDIBLE SHELL
FISH VARIETIES COMMONLY FOUND IN
SOUTH KERALA
Saneesh Kumar N
Assistant Professor
Department of Chemistry And Industrial Chemistry
T.K.Madhava Memorial College
Nangiarkulangara
Haripad, Alappuzha
3. SHELL FISH
Fishes without a skelton but
covered with some type of hard
shell
Different variety of shell fish are
available in kerala
Shell fish allergy is not common in
kerala
4. SHELL FISH
BROAD TERM FOR CRUSTACEANS AND MOLLUSKS SEA FOOD
CRUSTACEANS
CRUSTACEANS
MOLLUSKS
(BIVALVES)
8. OBJECTIVES OF THE STUDY
To determine the following in edible shell fish
verieties such as crab, prawn and clam
available in south kerala
Moisture content
Total ash content
Acid insoluble ash
Calcium and Magnesium
9. NEED,IMPORTANCE AND
SCOPE OF THE STUDY
Need to know the proximate composition of
fish food to estimate the intake of principal
nutrients in human diet
Requirement of regular updating of fish
nutrition table because of changes in nature
and source of raw materials in manufacturing
process
Quality Control -Requirement of simple and
rapid methods applicable to fish and fish
products
To ensure that fish products meet the
10. PREPARATION OF THE SAMPLES
After removing the shell, samples in
the form a homogeneous paste was
produced and was kept in air tight
containers at low temperature to
prevent loss of moisture
11. DETERMINATION OF MOISTURE CONTENT
Oven Drying Method
5g of well mixed sample in a silica
crucible was kept in an air oven at 1000c-
1050c for 6- 12 hours and was weighed
after cooling in a desicator for 30 minutes
Deciding shell life, texture of food
material
12. DETERMINATION OF ASH CONTENT
Total Ash Procedure
5g of well mixed sample was dried and
charred the portion by igniting with meker
burner and heated at 5500c-6000c in a
muffle furnace for 3 hour, a whitish grey ash
obtained was weighed.
Mineral content of fish
13. DETERMINATION OF ACID INSOLUBLE ASH
Total ash after evaporating with 3M HCl
was suspended in50 ml dil.HCl was boiled
and fitered through an ashless filter paper
and the total ash procedure was repeated
Indication of contamination in fish
14. PREPARATION OF SAMPLE SOLUTION
The filtrate obtained from the process
of determination of acid insoluble ash
was made up to 250ml. 100ml of the
sample solution were used for Ca2+ and
Mg2+ estimations.
Mg2+ ions necessary requirements
Activation of phosphate transfer enzymes
carbohydrate metabolism.
Mg2+ and Ca2+ responsible for the transmission of
electrical impulses along the nerve fibre and for the
contraction of muscles
15. ESTIMATION OF TOTAL CALCIUM AND
MAGNESIUM
COMPLEXOMETRIC TITRATION METHOD
100 ml of the sample solution(with 2ml NH3-
NH4Cl buffer,pH=10) was titrated against
EDTA (standardised with std. MgSO4
solution) using Erichrome black T
indicator(end point wine red to blue)
16. ESTIMATION OF CALCIUM
COMPLEXOMETRIC TITRATION METHOD
100 ml of the sample solution(with NaOH
,pH=12) was titrated against EDTA(0.02N)
using ammonium purpurate
(murexide)indicator(end point pink to purple)
The percentage composition of magnesium was
obtained from the estimated value of total calcium and
magnesium and that of calcium.
22. CONCLUSION
All the experimented shellfish contain
higher nutrient value that are not less
than the larger fish
All the three varieties consisting white
prawn, mud crab and clam contains
75-85% of moisture
Maximum total ash content suggest
high mineral contents in mud crab
23. High acid insoluble ash content in
mud crab may be due to the siliceous
impurities present in the edible portion.
Low value of calcium and magnesium
contents of clam may be due to the
loss of minerals during the recovery of
the fish from its shell.
Species-specific physiological
characteristics and changes in
environmental conditions might
24. SUGGESTIONS
Loss of minerals in clams during the
recovery of the fish from its shell can
be prevented by steaming the clams
before opening their shell.
Cheap shell fishes may be included
regularly in our diet to decrease the
nutrient deficiency as they are good
source of proteins and minerals .