Explain the observation or inference for seliwanoff test, Biology

Assignment Help:

Explain the Observation or Inference for seliwanoff's test?

1. Wine or cherry red colour seen. Wine red colour confirms the presence of a ketose sugar.

Note: On overheating aldoses also give the same reaction so continuous boiling should be avoided and test tube should be heated for 30 seconds to detect fructose.

2. seliwanoff's test is specific test for ketonic groups and therefore it is positive in case of sucrose. As studied in monosacccharides, seliwanoff's reagent contains HCl. In the presence of dil. HCl, sucrose  is hydrolyzed to glucose and fructose which then responds to the test.

3. Maltose and lactose on hydrolysis do not give fructose and so do not respond to this test. Starches and dextrins are made up mainly of glucose molecules. They do not contain a ketose and do not answer seliwanoff's test.


Related Discussions:- Explain the observation or inference for seliwanoff test

Explain risk analysis, Explain Risk Analysis Risk  Analysis  :  A  ...

Explain Risk Analysis Risk  Analysis  :  A  process  consisting of three components:  risk assessment,  risk  management  and risk communication

Explain procedure for sub-culturing of a culture, Explain Procedure for Sub...

Explain Procedure for Sub-Culturing of a Culture Now carry out the exercise following the steps given herewith: 1. Sterilize the inoculating loop and needle by heating to re

Homopolysaccharides, HOMOPO L YSACCHARIDE S (= HOMOGLYCANS) These...

HOMOPO L YSACCHARIDE S (= HOMOGLYCANS) These are complex carbohydrats that are formed by repeated condensation or polymerisation of only one type of monosaccharide monome

Chromosome jumping, Chromosome jumping is the technique whereby one begins...

Chromosome jumping is the technique whereby one begins with a piece of DNA from one area of a chromosome, and obtains clones from nearby areas without cloning everything in betwee

nutrient stability as affected by processing of feeds, Nutrient stability ...

Nutrient stability as affected by processing of feeds Nutrient stability under normal conditions of storage and processing is one of the important factors determining the effe

Classification based on digestive fate of carbohydrates, Explain Classifica...

Explain Classification Based on Digestive Fate of Carbohydrates? The digestive fate of carbohydrates depends on their inherent chemical nature (monosaccharide composition and t

Cover (area occupied) - quantitative characters, Cover (area occupied) - Qu...

Cover (area occupied) - Quantitative Characters Cover or specifically herbage cover refers primarily to the area of ground occupied by the leaves, stems and inflorescence i.e.

Explain the working of skeletal muscle, Explain the working of Skeletal Mus...

Explain the working of Skeletal Muscle? Skeletal muscle is under voluntary control and is responsible for voluntary movements of body parts. Skeletal muscle is also called stri

What is the original concentration, A sample of yeast cells was serially di...

A sample of yeast cells was serially diluted 1/10 five times then serially diluted 1/3. the number of yeasts was338 yeasts per ml. what was the original concentration? Please show

Types of osmotic exchanges, Types of Osmotic Exchanges The osmotic exc...

Types of Osmotic Exchanges The osmotic exchanges that take place between an animal and its environment are of two different types: Obligatory exchanges and Regulated

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd