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Determination of Vitamin A
Vitamin A assay is carried out by chemical method. This method is called Carr Price Reaction.
Vitamin A and the carotenoids produce an intense blue colour upon addition of a saturated solution of antimony trichloride in anhydrous and alcohol-free chloroform. This reaction is called Carr Price Reaction and used to determine Vitamin A. The absorption maxima is around 620 nm.
In another method, absorption of vitamin A dissolved in isopropyl alcohol is determined at wavelengths of 310, 325 and 334 nm. This method is suitable for the determination of pure vitamin A (or of the ester after their saponification), such as oily solutions as well as in tablets, coated tablets, capsules and other formulations.
Im learning about difference cell structures in science. I was wondering if I might be able to get some information about the epithelial tissue, and the connective tissue. Thankyou
Louis Pasteur (1860-1862) French): Even after the experiments of Spallanzani, the conflict of a biogenesis and biogenesis continued well into the middle of 19 th century till
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The major function of the nerve cells of the body is contact. This is accomplished by passing electrical and chemical messages from neuron to neuron or from neuron to one other goa
Nitrogen is needed mostly for the synthesis of amino acids and nucleotides. Sources of nitrogen can be obtain from organic as well as inorganic sources, but the whole target is the
economic importance
Describe Valvar Aortic Stenosis Murmurs ? Characteristic: Harsh, rasping crescendo-decrescendo murmur best heard anywhere in a straight line from right 2nd ICS to apex ("sash"
Glucose is a six-carbon single sugar; It is the most common energy source.
human digestive system and the functions
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