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What tests could be run to test the purity and type of HCG?

We are looking to purchase HCG from China but the purity and quality varies between labs, we are able to receive samples of the raw peptide and can use a contracted lab to perform tests but due to my academic background I have no clue which tests to request to determine the purity and type of the raw powder. The following is what we should be receiving from the labs in China.

Product Description CAS Number: 9002-61-3 pI = 2.951 Extinction Coefficient: EmM = 3.88 (278nm)2 Synonym: Choriogonin, hCG The molecular weight is approximately 37.9 kDa (with approximately 31% carbohydrate by weight). The theoretical molecular weight is 37.9 kDa based on the native form, which contains 2 subunits. The α subunit has a molecular weight of 14.9 kDa of which approximately 10.2 kDa is for the polypeptide and approximately 4.7 kDa for the carbohydrate. The β subunit has a molecular weight of 23 kDa of which approximately 16.0 kDa is for the polypeptide and approximately 7.0 kDa is for the carbohydrate.3,

To answer Mad Scientists Question, the peptide is "supposed" to be CGA (1081) for use on humans. This is why it is so important for us to find a test that can define the qualities of the raw peptide.

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What exactly do you want to do with it afterwards? The level of purity and the kind of contamination that would be acceptable is very different if you do some in vitro experiments or if you do in vivo experiments in animals, not to speak of giving it to humans. –  Mad Scientist Aug 31 '13 at 7:24

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