Biochemistry 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

Diagram showing step-by-step procedures for Indirect, Sandwich, and Competitive ELISA assays including coating, blocking, antibody addition, and substrate color development.

March 20, 2026 Biochemistry

ELISA Protocols: Step-by-Step Guide to Indirect, Sandwich, and Competitive ELISA

Learn how to perform ELISA assays with our detailed, step-by-step guide. Understand Indirect, Sandwich, and Competitive ELISA protocols, sample preparation, enzyme reactions, and data analysis for precise biomolecule detection. Read more

Infographic explaining protein folding showing primary, secondary, tertiary, and quaternary structures along with molecular chaperones and protein misfolding diseases.

March 14, 2026 Biochemistry Biology

Protein Folding & Structure: Why 3D Conformation Determines Life

Explore how amino acids fold into proteins. Learn about alpha-helices, hydrophobic effect, molecular chaperones, and why misfolding leads to Alzheimer’s. Read more

diagram showing the four levels of protein structure including primary amino acid sequence, secondary alpha helix and beta sheet, tertiary folded protein, and quaternary protein complex.

March 14, 2026 Biochemistry Biology

Protein Structure: The 4 Levels of Protein Organization Explained

Explore the four levels of protein structure, from primary amino acid sequences to complex 3D folding and multi-subunit quaternary complexes. 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

Hand-drawn educational diagram of an atom's electron shells and energy levels, using blue ink for low-energy inner shells and red ink to highlight high-energy valence electrons.

February 5, 2026 Biochemistry Chemistry

Electrons and Energy Levels: Electron Shells, Orbitals, and Chemical Bonding

Electrons orbit atoms in energy levels, forming valence electrons that drive chemical bonding and element behavior. Read more

Hand-drawn atomic structure diagram showing a central nucleus with protons and neutrons, surrounded by a shaded electron cloud and handwritten labels for atomic number and charges.

February 5, 2026February 5, 2026 Biochemistry Chemistry

Atomic Structure: Atoms and the Subatomic Particles

Explore atomic structure, subatomic particles, and atomic theory to understand how atoms form matter and chemical behavior. Read more

Hand-drawn periodic table sketch on notebook paper highlighting the major elements of life (H, C, N, O), secondary elements, and trace elements with handwritten educational annotations.

February 5, 2026February 5, 2026 Biochemistry Chemistry

Elements of Life: Periodic Table and the Building Blocks of Living Matter

Learn how elements, the periodic table, and trace minerals form living matter and affect human health. Read more

diagram of calibration curves showing standards, linear fit, and LOD/LOQ

January 11, 2026 Biochemistry Protocols and Techniques

Calibration Curves in Analytical Chemistry: Principles, Procedure, and Applications

Calibration curves are essential tools in analytical chemistry, biochemistry, and pharmaceutical analysis. They help understand the instrumental response to an analyte and predict the concentration... Read more

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