Food Tests: To examine the Presence of Reducing Sugars plus the Presence of Protein

 Food Testing: To Study arsenic intoxication Reducing Sugar and the Presence of Proteins Essay

Test 2: Food Tests


* To analyze the presence of reducing sugars.

2. To study the existence of protein.


In this test, glucose, maltose, lactose and sucrose bring testing reducing and non-reducing sugars. Blood sugar is monosaccharide while maltose, lactose and sucrose will be disaccharides of carbohydrates. Monosaccharaides are the monomers which make up all other sugars and cannot be broken in to smaller elements by hydrolysis. Disaccharides happen to be formed from your condensation reaction between two monosaccharaides and therefore are linked by glycoside connection. All monosaccharaides and some disaccharides such as maltose and lactose are reducing sugars because of the presence of aldehyde or keto groupings in the all kinds of sugar. Sucrose can be described as nonreducing sugars because the aldehyde group of glucose is from the keto group of fructose and loses it is reducing capability. The Benedict's test is used as it allows the diagnosis of the existence of lowering sugars. Most monosaccharaides and several disaccharides which have exposed carbonyl groups can react with Benedict's solution, whereas additional disaccharides will not react with Benedict's answer. The bad particals from the aldehyde or ketone group of minimizing sugar will certainly react with all the copper sulfate from the Benedict's solution to kind cuprous oxide, a red-brown precipitate. A nonreducing sugar will be verified by a negative test of Benedict's solution before hydrolysis by acids, followed by an optimistic test of its hydrolysis into monosaccharide components. The iodine test out is done to distinguish glycogen and starch. The polysaccharides complement the iodine which will provide a black-blue coloration. You will discover two testing that are widely used to test for protein which are the Millon's and Biuret's test. A Millon's test detects the amino acid tyrosine of course, if the healthy proteins possess a selected substance, simply then it gives out an optimistic result. However , the Biuret test is done to identify the presence of proteins in a substance simply by detecting the peptide links. The peptide bond is definitely the bond between carboxyl acid group and the amino group on surrounding amino acids within a protein. Healthy proteins, containing peptides bonds, the moment reacted with copper sulphate solution of Biuret reagent gives a purple complex. The Biuret evaluation is mostly utilized to check for digestive enzymes which are made up of proteins.


2. Glucose

2. Maltose

* Sucrose

* Distilled water

2. Potassium Iodide solution

5. Benedict's Reagent

* Salt Hydrogen Carbonate solution

* Dilute Hydrochloric Acid answer

* Starch solution

* Albumin solution

* Potassium Hydroxide option

* Copper mineral Sulfate remedy


2. Test pontoons

* White-colored tile

* Water bath

* Dropper


A) Tests pertaining to Reducing and nonreducing Sugars

i) Evaluation for Minimizing Sugar

1 . The water in the normal water bath can be brought up to boiling level and the method to obtain heat is turned down retaining the temp. 2 . 2cm2 of blood sugar solution can be poured in to the test pipe and 2cm2 of Benedict's reagent can be added into the test pipe. 3. The answer is then shaken till the reagent is usually mixed with the glucose solution thoroughly. 4. The test conduit is then put in the water bathtub and is still left for five minutes. 5. The colour change is observed and recorded.

6th. Steps 2-5 is repeated with sucrose, lactose and maltose in separate test tubes.

ii) Test pertaining to nonreducing Sugar.

1 ) A sample of nonreducing sugars is identified from the test done in Section A(i). 2 . A new sample of 2cm3 of the sucrose solution is definitely poured right into a clean check tube and 1cm3 of hydrochloric acid is added into the fresh sample of sucrose. 3. The alternatives are blended thoroughly and left inside the water shower for approximately 2-3 minutes. some. After hot the solution, litmus paper is dropped in to the solution and sodium hydrogen carbonate is definitely added head to drop in to the test tube until the remedy turned somewhat...