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If Biuret and Millon's test give positive result what is the conclusion?
If both Biuret and Millon's tests give a positive result, it suggests the presence of proteins in the sample. Biuret test is specifically for proteins containing peptide bonds, while Millon's test is used for identifying proteins with tyrosine residues. The positive results from both tests provide strong evidence for the presence of proteins in the sample.
Which halogens give a positive beilstein test?
Chlorine, bromine, and iodine give a positive Beilstein test. The test involves ignition of a compound in the presence of copper oxide, which forms a green flame due to the halogen present in the compound.
What is principle of iodine test?
The principle of the iodine test is based on the ability of iodine to form a starch-iodine complex, which is a blue-black color. This test is commonly used to detect the presence of starch in a sample by observing a color change when iodine is added. If starch is present, the blue-black color will appear, indicating a positive result for the presence of starch.
Will adrenaline give a positive xanthoproteic test?
No, adrenaline will not give a positive xanthoproteic test. The xanthoproteic test is used to detect the presence of proteins, not hormones like adrenaline. Adrenaline is a hormone that is involved in the body's fight-or-flight response, and it does not react in the same way as proteins do in the xanthoproteic test.
Why cant you simply add iodine to an untreated leaf to test for starch?
Iodine is not a direct indicator of starch on untreated leaves because there may be other substances present that could give false positive results. Staining with iodine is more effective after boiling the leaf to remove other compounds and facilitate the starch-iodine reaction. This process ensures that the iodine specifically reacts with starch molecules.
If Biuret and Millon's test give positive result what is the conclusion?
If both Biuret and Millon's tests give a positive result, it suggests the presence of proteins in the sample. Biuret test is specifically for proteins containing peptide bonds, while Millon's test is used for identifying proteins with tyrosine residues. The positive results from both tests provide strong evidence for the presence of proteins in the sample.
Is glucose expected to have a positive iodine test?
Yes, glucose is expected to give a positive iodine test. Iodine reacts with glucose to form a blue-black color, indicating the presence of reducing sugars in the sample.
Why did a solution of saliva and oats test positive with benedict's test and iodine test if the oats alone tested positive only in the iodine test and the saliva alone was negative for both?
Saliva contains the enzyme amylase which breaks down starches in oats into simple sugars like glucose, which can then react with Benedict's solution to give a positive test result. The iodine test detects the presence of starch, which is in oats but not in saliva, explaining why the combination tested positive in both tests.
Can antibiotics give positive readings in pregnancy tests?
yes
Why are xanthoproteic and millon-nasse test unsatisfactory for the use in examination for proteins?
The xanthoproteic test involves nitration of aromatic amino acids in proteins, which may not always be specific for proteins as other compounds containing these amino acids can give false positive results. The Millon-Nasse test is based on the reaction of phenol groups in proteins, which can also react with other substances containing phenol groups, leading to false positive results. Overall, these tests lack specificity and can give inaccurate results when used to examine proteins.
Why glucose does not give positive result with iodine test but not starch?
Glucose does not give a positive result with the iodine test because iodine specifically binds to the helical structure of amylose, a component of starch, forming a blue-black complex. Glucose, being a monosaccharide, does not possess this helical structure, and therefore does not interact with iodine in the same way. In contrast, starch, which is a polysaccharide made up of multiple glucose units, presents the necessary structure for the iodine to react and produce a visible change.
What type of food will give a negative Iodine test and a positive Biuret Solution test?
An iodine test is used to test for the presence of starch (or polysaccharides, specifically amylose or amylopectin). A Biuret solution test is used as an indicator for peptide bonds within proteins. Therefore, if you get a negative iodine test and a positive Biuret test, you would probably be testing a animal food source (beef, chicken, pork). Overall, any food that doesn't have starch present within it would be appropriate to use. Hope this helps!
What does iodine solution test for?
For starch, which will give a deep blue-black color.
Which halogens give a positive beilstein test?
Chlorine, bromine, and iodine give a positive Beilstein test. The test involves ignition of a compound in the presence of copper oxide, which forms a green flame due to the halogen present in the compound.
Will you test positive for meth taking Benadryl?
No, Benadryl (diphenhydramine) will not give a false positive for methamphetamine. However, Benadryl may cause a false positive for methadone in simple immunoassay tests, though more advanced tests can resolve a disputed result.
What is principle of iodine test?
The principle of the iodine test is based on the ability of iodine to form a starch-iodine complex, which is a blue-black color. This test is commonly used to detect the presence of starch in a sample by observing a color change when iodine is added. If starch is present, the blue-black color will appear, indicating a positive result for the presence of starch.
Will adrenaline give a positive xanthoproteic test?
No, adrenaline will not give a positive xanthoproteic test. The xanthoproteic test is used to detect the presence of proteins, not hormones like adrenaline. Adrenaline is a hormone that is involved in the body's fight-or-flight response, and it does not react in the same way as proteins do in the xanthoproteic test.
