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What sugar might be present in a sweet tasting food that tests negative with the Benedicts reagent?
Sucrose. Sucrose is a disaccharide therefore does not have free electrons in the sugar to react with the Benedict reagent. Glucose has free electrons therefore shows positive with the Benedict reagent.
Is fructose gives positive test with tollens reagent?
Fructose does not give a positive test with Tollens' reagent because it is a reducing sugar that does not have a free aldehyde group capable of reducing the Tollens' reagent. Tollens' reagent is typically used to detect the presence of aldehydes but may not react with fructose due to its ketone functional group.
What is a Benedict's reagent?
To favor the existence of the free aldehyde form by suppressing ring formation. If the sugar exist in the ring form it can not react
How would lactose react towards benedict's?
Lactose is a disaccharide composed of glucose and galactose, therefore it would react with Benedict's reagent to produce a positive result. Benedict's reagent is used to test for reducing sugars, and since lactose contains a free anomeric carbon that can reduce copper ions present in the reagent, it would give a color change from blue to brick-red precipitate upon heating if lactose is present.
Are all amino acids reactive with the Biuret reagent?
Not all amino acids react with the Biuret reagent. The Biuret test specifically detects the presence of peptide bonds, which are formed when amino acids link together in proteins. Therefore, free amino acids without peptide bonds do not produce a color change with the Biuret reagent. However, when amino acids are part of a polypeptide or protein, they will react positively with the Biuret test.
What has the author JOHN MARTIN FISCHER written?
JOHN MARTIN FISCHER has written: 'FOUR VIEWS ON FREE WILL'
How do you distill the pyridine?
Pyridine can be distilled by heating it in a distillation apparatus until it vaporizes, then collecting the vapors and condensing them back into liquid form in a separate container. The distillation process separates pyridine from impurities and allows for purification of the compound.
What carbohydrates have no reaction to fehling's reagent?
Carbohydrates that have no reaction to Fehling's reagent include sucrose, which is a non-reducing sugar. Non-reducing sugars do not have free ketone or aldehyde groups available for oxidation reactions with Fehling's reagent.
What sugar might be present in a sweet tasting food that tests negative with the Benedicts reagent?
Sucrose. Sucrose is a disaccharide therefore does not have free electrons in the sugar to react with the Benedict reagent. Glucose has free electrons therefore shows positive with the Benedict reagent.
Is fructose gives positive test with tollens reagent?
Fructose does not give a positive test with Tollens' reagent because it is a reducing sugar that does not have a free aldehyde group capable of reducing the Tollens' reagent. Tollens' reagent is typically used to detect the presence of aldehydes but may not react with fructose due to its ketone functional group.
What does DPD stand for in chlorine testing?
The reagent used in determining free and total chlorine residual for disinfection of drinking water. The chemical name of the reagent is NN Diethyl-p-Phenylenediamene.
What is the chemical formula of chlorotex reagent used in free chloride determination?
Oh, dude, you're asking about the chemical formula of chlorotex reagent? That's like asking me to recite the entire periodic table backwards while juggling flaming torches. But hey, since you asked, the chemical formula for chlorotex reagent used in free chloride determination is typically NaOCl. But seriously, who memorizes that stuff?
Why should you use ammonia-free distilled water on preparing of urea reagent?
i dont know soory
Which reagent would you use to test for lipids in supposedly fat free donuts?
I just had this one of my exams and the answer is Nile blue.
What is a Benedict's reagent?
To favor the existence of the free aldehyde form by suppressing ring formation. If the sugar exist in the ring form it can not react
Why egg albumin and casein did not react ninhydrin reagent?
It should react to this reagent. However it must be HEATED before it will react.This is due to the fact that when Ninhydrin is heated it stabilizes and the reacts with the -NH2 groups on the amino acid.
Why trihalose deos not give seliwanoff'?
Trehalose does not give a positive test with Seliwanoff's reagent because trehalose is a non-reducing sugar. Seliwanoff's reagent reacts with ketoses to form a red color, but since trehalose contains two glucose units linked by an α,α-1,1-glycosidic bond, it does not have a free ketone or aldehyde group necessary for the reaction with Seliwanoff's reagent.
