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Will hydrolysed dextrine give positive response to Benedict test?
Yes, it should. Benedicts test will be positive for reducing sugars, and since glucose is such a sugar, and would be a product of dextrin hydrolysis, you should get a positive result with Benedicts reagent.
Will mannose produce a positive Benedict's test?
Yes, mannose will produce a positive Benedict's test result as it is a reducing sugar. Benedict's reagent is used to detect the presence of reducing sugars such as glucose, fructose, and mannose by forming a reddish-colored precipitate when reacted with them.
Why Tollens reagent does not react with ketone?
Tollens reagent is a mild oxidizing agent that reacts with aldehydes to produce a silver mirror. Ketones, however, do not have a hydrogen atom bonded to the carbonyl group, making them resistant to oxidation by Tollens reagent. As a result, ketones do not react with Tollens reagent.
What is the positive result for sakaguchi test?
A positive result for the Sakaguchi test is the formation of a white or yellow precipitate in the presence of arginine or histidine in the test sample. This precipitate forms when ninhydrin (reagent used in the test) reacts with the guanidine group of arginine or the imidazole group of histidine.
Do glucose give a positive result for anthrone test?
Yes, glucose gives a positive result for the anthrone test. The anthrone reagent reacts with the carbohydrates present, including glucose, producing a blue-green color that can be detected spectrophotometrically.
What substrate gives a positive reaction for benedicts reagent?
Reduction of Benedict's reagent occurs with reducing sugars such as glucose, fructose, and galactose, giving a positive test result. This test is used to detect the presence of reducing sugars in various food products.
Will hydrolysed dextrine give positive response to Benedict test?
Yes, it should. Benedicts test will be positive for reducing sugars, and since glucose is such a sugar, and would be a product of dextrin hydrolysis, you should get a positive result with Benedicts reagent.
Will l-fucose produce positive in the Benedicts test?
L-fucose will not produce a positive result in the Benedict's test. The Benedict's test is designed to detect reducing sugars, and while L-fucose is a sugar, it does not have the necessary functional groups to act as a reducing agent. Therefore, it will not react with the copper ions in the Benedict's reagent to form a colored precipitate.
What white blood cell would not produce a positive leukocyte esterase test on the urine chemical reagent strip?
Lymphocytes would not produce a positive leukocyte esterase test on a urine chemical reagent strip. The leukocyte esterase test primarily detects the presence of neutrophils, which release the enzyme leukocyte esterase. Since lymphocytes do not produce this enzyme, their presence in the urine would not contribute to a positive test result.
If benedicts reagent turns red what substance is present?
If Benedict's reagent turns red after adding it to a solution, it indicates the presence of reducing sugars such as glucose or fructose. The red color is a result of the reduction of copper (II) ions in the reagent to copper (I) oxide by the reducing sugars.
Why would glucose give positive result upon prolonged heating with seliwanoff's reagent?
Glucose gives a positive result with Seliwanoff's reagent upon prolonged heating because it is a reducing sugar that can reduce the reagent, leading to the formation of a cherry-red complex. This occurs due to the dehydration of glucose under acidic conditions, producing furfural, which then reacts with the reagent. The prolonged heating enhances this reaction, resulting in the characteristic color change indicative of a positive result.
Will mannose produce a positive Benedict's test?
Yes, mannose will produce a positive Benedict's test result as it is a reducing sugar. Benedict's reagent is used to detect the presence of reducing sugars such as glucose, fructose, and mannose by forming a reddish-colored precipitate when reacted with them.
When glycogen is added to benedicts reagent why would it remains blue?
Although glycogen is a carbohydrate, it is classified under POLYSACCHARIDES which are non-reducing sugars. Benedict's reagent is used to test for the presence of non-reducing sugars. The positive result for this is a brick-red precipitate or solution. It remained blue (which is negative) due to fact that ALL POLYSACCHARIDES (such as glycogen) ARE NON-REDUCING SUGARS > I'm a Nursing Student. >M.J.T.M.E.
What color does acetone with Benedict's reagent have?
Acetone itself does not react with Benedict's reagent, which is primarily used to detect reducing sugars. Therefore, when acetone is mixed with Benedict's reagent, there would be no significant color change, and the solution would likely remain blue. The blue color indicates the absence of reducing sugars, as acetone does not possess the necessary functional groups to produce a positive result with this reagent.
Indication of a negative result with Bial's Reagent?
A negative result with Bial's reagent will show no color change, indicating the absence of pentoses in the test sample. This can be confirmed by the lack of a green color formation, which is characteristic of a positive result when pentoses are present.
What is the results of aldehyde test for alcohol?
The aldehyde test for alcohol typically involves the use of reagents like the Schiff's reagent or the chromic acid test. When primary and secondary alcohols are present, they can be oxidized to aldehydes or ketones, which will then react with the reagents, resulting in a color change. For instance, a positive result with Schiff's reagent will show a color change to pink or magenta. Tertiary alcohols do not produce aldehydes upon oxidation and will not give a positive result in this test.
Explain the chemical mechanism for detecting indole in a bacterial culture?
Indole is extracted from the medium and into the reagent layer (Kovac's) by the acidified butyl alcohol component and forms a complex with the p-dimethylaminobenzaldehyde, yielding the cherry red color seen when the culture is indole positive.
