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When a sample give negative result for ninhydrin and biuret test but the same sample give positive result for xanthoprotic testwhy?
A sample that gives negative results for both the ninhydrin and biuret tests suggests the absence of free amino acids and proteins, respectively. However, a positive result for the xanthoprotic test indicates the presence of aromatic amino acids, such as tryptophan or tyrosine, which can react with nitric acid to form a yellow compound. This discrepancy suggests that while the sample does not contain free amino acids or proteins in detectable amounts, it does contain aromatic amino acids bound within a structure that does not release them under the conditions of the ninhydrin or biuret tests.
What are positive and negative controls in an experiment?
Positive controls : an experimental treatment that will give the desired result Negative controls: An experimental treatment that will NOT give the dersired result.
Will superpump250 give a positive drug test result?
No
Does lactose can give a positive result in xanthoprotein test?
nitration of the benzene ring and gives positive
Can periactin give positive result for cociane?
can periactin show up positive for drugs in urine
If you kiss your boyfriend while he is drinking can that give a positive result?
No. You wouldn't get enough alcohol in your system to be positive.
Is it possible for nexium to give a false positive pregnancy test result?
No
Will disaccharides and poly saccharides give a positive result to molisc test?
Yes, both disaccharides and polysaccharides will give a positive result in a Molisch test. The Molisch test detects the presence of any compound containing a significant amount of glycosidic bonds, which are present in both disaccharides and polysaccharides.
Is acetaminophen will give positive result to Lassaigne's test and ferrox paper test?
Acetaminophen is not expected to give a positive result in Lassaigne's test for nitrogen and sodium due to its lack of nitrogen-containing functional groups. Similarly, it is unlikely to give a positive result in the ferrox paper test, which is typically used for detecting the presence of phenols.
What can cause a positive methamphetamine result in a hair test?
sudafed can give u a false positive for meth be careful
Do proteins give positive iodine tests?
Yes, proteins can give a positive iodine test. When iodine reacts with proteins, it forms a complex that results in a brown color change, indicating a positive test for proteins.
Will gelatin give a positive Biuret test?
yes Gelatin will have a positive biuret test. this is because it has an amide group which bends over the copper ion giving the colour pink or violet off to the visual eye.
