Extraction of DNA via onions

 Extraction of DNA via onions Composition



The purpose of the experiment was to experience firsthand the seclusion of GENETICS form a plant tissue without eliminating its structure and pattern. A white-colored onion utilized for the experiment. Following several procedures, DNA isolate was the obvious result. Distinct chemical testing were performed on the GENETICS isolate, namely: Dische Check, Murexide Evaluation, Wheeler-Johnson test and Test to get Phosphate. Noticeable results were in that case noted.


DNA (deoxyribonucleic acid) was discovered in the late 1800s, but its role as the fabric of genetics was not elucidated for 50 years there after. It uses up a central and important role inside the cell since the innate information in which all the information required to duplicate and maintain the patient.

Today, Scientists can evaluate DNA from minute samples of blood, hair roots and saliva, but before they can analyze DNA, scientists must be able to remove it. The process of DNA removal is the very first step for many lab procedures. Researchers must be able to isolate the DNA through the other unwanted substances of the cell softly enough so the DNA is not broken up.

For this test, an onion was used due to its low starch content, which allows the DNA to be even more clearly viewed. The salt protects the bad phosphate ends of DNA, which allows these ends to come better so that the DNA can medications out of any cold alcoholic beverages solution. The homogenizing remedy causes the cell membrane layer to break down by dissipating the fats and protein of the cell, which disturbs the provides that hold the cell membrane together. The homogenizing solution then varieties complexes while using lipids and proteins leading to them to medicine out of the solution.

After the isolation of the GENETICS from the solution, different substance tests were then performed on the separate, which were: The Dische Check, Murexide Evaluation, Wheeler-Johnson Ensure that you Test to get Phosphate.

The Dische test out is a test done to identify DNA. It's the reaction among Dische reagent & 2-deoxypentose yields a blue shaded solution.

The Murexide evaluation a check in which the treatment of a material, usually urine, with nitric acid and ammonia signifies the presence of the crystals by creation of murexide. Positive results type this test yields Purines form Discolored to Red-Violet.

The Wheeler-Johnson Test is actually a qualitative check for the pyrimidine basics cytosine and uracil, which usually produces a green coloration when the sample is definitely treated with bromine water. The addition of ba (symbol) hydroxide is going to turn the liquid crimson.

The Test to get phosphate is employed to find phosphate inside the DNA, great reaction brings yellow medicine.


The following procedures were done in so that it will isolate the DNA through the onion. Initial, the onions were minced and then weighed to 25g. The onions were minced because by mincing the onions, this increase their surface area that helps make the membrane at the area easier to break down, and also allows for more efficient ingestion of heat and solutions.

Up coming it was included in a 50ml homogenizing remedy, this was completed because the homogenizing medium, created from 5% SDS, 0. 15M NaCl, zero. 15 Meters sodium citrate and zero. 001 Meters EDTA, was similar to a detergent. It helped break up the phospholipid bilayer of the cells' plasma membranes and nuclear envelopes. The moment in SDS, the aminoacids and lipids of the membrane, but especially the lipids, are broken down because the SDS triggers the provides holding the membrane collectively to break. The lipids, which are repelled by the SDS, separate and split up the membrane. This is why detergent is used to remove a fat stain; fat is a lipid. The EDTA helped weaken the membrane as well, producing the DNA that is at the nucleus now available to get extracting.

Then the solution together with the onion was heated by 60 degrees, this method utilized to speed the break down process by energizing the molecules, and also, hopefully assist to...

References: Literature:

[1] Stoker, Stephen. Checking out General, Organic, and Natural Chemistry. Cengage Learning, 2010.

[2] Straumans, Andrei. Neurological Chemistry: A guided inquiry. Houghton Mifflin, Boston, MUM, 2012.


[3] Keusch, Peter. (n. d). _Test for Deoxyribose in DNA_. Retrieved coming from http://www.uni- regensburg. de/Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/p3 1_d_rib-e. htm

[4] _Extraction of DNA via Onion_. Recovered from o/tchrplan/oniondna. html

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