Amino Acids Archives - THE SCIENCE NOTES

The diagram shows three sequential test tubes illustrating the qualitative analysis of proteins containing aromatic amino acids. Step 1 shows a test tube labeled "NITRATION" where concentrated nitric acid ($HNO_3$) is added to a protein sample, beginning to form a light yellow color representing nitrated aromatic amino acids. Step 2 shows the test tube being gently heated over a small burner flame, producing a distinct yellow substance labeled "Xanthoproteic Acid" to ensure reaction completion. Step 3 shows sodium hydroxide ($NaOH$) alkali being added via a dropper, resulting in a dark yellow-orange positive result due to the intensification into an orange salt.

June 3, 2026 Biochemistry Protocols and Techniques

Xanthoproteic Test: Qualitative Protein Analysis Using Nitric Acid

Learn how the xanthoproteic test uses nitric acid to detect aromatic amino acids in proteins, including principle, procedure, results, uses, and limitations. Read more

Hand drawn diagram showing amino acid structure with amino group, carboxyl group, R group and categorized list of amino acids including nonpolar, polar, acidic and basic types.

March 14, 2026 Biochemistry Biology

Amino Acids and Proteins: Structure, Peptide Bond Formation, and Biological Functions

Proteins are polymers of amino acids linked by peptide bonds. Learn about protein structure, amino acids, peptide bond, and functions. Read more

Proteins and amino acids showing 3D protein folding, peptide bond formation, and primary, secondary, tertiary, and quaternary structures, with labeled amino acid side chains.

February 21, 2026 Biochemistry

Proteins and Amino Acids: Structure, Function, and Biological Importance

Proteins are the molecular machines of life. Every cell in every living organism depends on proteins to survive, grow, communicate, and respond to the environment.... Read more

April 8, 2023April 29, 2023 Food Science

Amino Acids: Types, Functions, Sources, and Differences between Essential and Non-Essential Amino Acids

Discover the types, functions, sources, and differences between essential and non-essential amino acids in this comprehensive guide. Read more

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