Problem 2 - Objective Biology for NEET

Question

To analyse the chemical composition of living tissue we solubilize them in (a) \(\mathrm{HNO}_{3}\) (b) \(\mathrm{HCl}\) (c) \(\mathrm{CF}_{3} \mathrm{COOH}\) (d) \(\mathrm{CCI}_{3} \mathrm{COOH}\)

Step-by-Step Solution

Answer

The best option to solubilize living tissues for chemical composition analysis is Trifluoroacetic acid or \(\mathrm{CF}_{3} \mathrm{COOH}\).

Step 1: Analyzing HNO3

First consider \(\mathrm{HNO}_{3}\) or Nitric Acid. Nitric acid is a strong and corrosive acid often used in laboratory reagents. It's also used in the digestion of plants and lichen before elemental analysis. However, it is too corrosive and reactive to be used with living tissues.

Step 2: Analyzing HCl

Next, consider \(\mathrm{HCl}\) or Hydrochloric Acid. Hydrochloric Acid is one of the strongest acids and is often used to adjust pH levels in solutions. However, it's highly corrosive nature makes it unsuitable for use with living tissues.

Step 3: Analyzing CF3COOH

Next, consider \(\mathrm{CF}_{3} \mathrm{COOH}\) or Trifluoroacetic acid. It is also a strong acid but less reactive and corrosive than the first two, thus making it a good option for use with living tissues. Trifluoroacetic acid is also used in protein sequencing and synthesis.

Step 4: Analyzing CCl3COOH

Lastly, consider \(\mathrm{CCI}_{3} \mathrm{COOH}\) or Trichloroacetic acid. It is a corrosive acid and less commonly used in biochemistry, particularly because it's known to be a strong protein denaturant.

Key Concepts

Nitric Acid in Biology

Nitric acid ((HNO_3)), known for its role in laboratory settings, particularly when dealing with non-living biological samples. It's highly valued for its ability to break down complex organic matter through oxidative processes.

Despite its efficacy in dissolving tough plant materials, its highly corrosive and reactive nature makes it unsuitable for analyzing living tissue. The crucial point here is 'living'— nitric acid's strength would irreversibly damage cells, distorting the very chemical composition we aim to study in living tissues.

Hydrochloric Acid in Tissue Analysis

Hydrochloric acid ((HCl)) stands as a key component in various fields of scientific research, most notably within the domain of digestive processes, where it mirrors the acidic environment of the stomach.

This strong acid plays a pivotal role in adjusting the pH of solutions, essential to various biochemical reactions. However, its highly corrosive qualities render it too harsh for direct application in living tissue analysis, as it can significantly alter or destroy the tissues it comes into contact with.

Trifluoroacetic Acid and Living Tissues

Trifluoroacetic acid ((CF_3COOH)) is another potent acid, but it is differentiated by its lower reactivity compared to nitric and hydrochloric acids. This distinctive property makes it suitable for use with living tissues, allowing for the study of biological molecules without inducing excessive damage.

In the context of protein sequencing and synthesis, trifluoroacetic acid's less aggressive nature is beneficial. It can gently solubilize proteins without the destructive tendencies of its stronger counterparts, maintaining the integrity of the biological samples under investigation.

Trichloroacetic Acid in Biochemistry

Trichloroacetic acid ((CCl_3COOH)), while notable for its application in biochemistry, particularly in protein precipitation, carries the caveat of being a potent protein denaturant. Its capacity to disrupt protein structure implies that, although useful in certain biochemical applications, its utility in the analysis of living tissues is limited.

The nuanced understanding of trichloroacetic acid's effects on proteins is crucial—it can be a double-edged sword, effectively isolating proteins for analysis but potentially denaturing them in the process, which could skew the results of living tissue composition analysis.