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Spot Test for Minerals
The minerals or inorganic compounds used in animal feed either occur in nature or are chemically compounded. They are essential components of bone, blood, protein, fat and regulate the acidity or alkalinity of the digestive juices.
Preparation of sample
Usually, the minerals in mixed feed exist as powder or fine particles. Sieve the sample [...]
Principle:
Hydrolyzed feather meal contains a high percentage of cystine (6 – 7%). When the sample is digested with sodium hydroxide, the cystine and cysteine are liverated and reacted with lead acetate give the dark brown black color on the surface of the particle.
Reagents:
1. Solution A. Sodium hydroxide 10%
2. Solution B. Dissolve 50 g of lead [...]
Principle:
Most adulterants such as ammonium sulfate, ammonium phosphate, ammonium nitrate, etc., are non-protein nitrogen and are soluble in water. When react with mercuric potassium iodide alkaline solution mixture, a heavy orange color precipitate occurs.
Reagent:
Mercuric-potassium iodide alkaline solution. A 1.25 g. aliquot of mercuric chloride is made into a thin paste with little water and 3.5 [...]
1. Place 10 g of fish meal in a 100 ml tall from beaker and pour in 80 ml carbon tetrachloride, stir and allow settling (5 min).
2. Scrape off the floating organic fractions with stainless steel spoon into a filter paper. Clean off the side of the beaker and spoon and then pour off the [...]
Basically, fish meal is produced from two types of raw materials, fish wastes from the human food industry and whole fish. Differences in composition of fish meal may be attributed to many causes; such as variation in raw materials, differences in processing, contamination of raw materials with some waste products. These include sand, salt, fat, [...]