# Peptide Science Overview

**Peptides** are short chains of amino acids linked by peptide bonds. Typically defined as chains of 2 to 50 amino acids, they occupy the molecular space between small molecules and proteins. This archive documents their structural properties, synthesis methods, and analytical techniques.

> **DISCLAIMER**: This archive is for **educational and research purposes only**. The content herein does not constitute medical advice, diagnosis, or treatment recommendations.

## Fundamental Concepts

- **Amino Acids**: The 20 standard building blocks, each with unique side chains
- **Peptide Bond**: An amide linkage formed between the carboxyl group of one amino acid and the amino group of another
- **Primary Structure**: The linear sequence of amino acid residues
- **Secondary Structure**: Local folding patterns — alpha-helices and beta-sheets
- **Tertiary Structure**: The overall three-dimensional conformation

## Classification by Size

| Category | Residue Count | Molecular Weight Range |
|----------|--------------|----------------------|
| **Dipeptide** | 2 | ~200-300 Da |
| **Oligopeptide** | 3-20 | ~300-2,000 Da |
| **Polypeptide** | 21-50 | ~2,000-5,500 Da |
| **Small Protein** | >50 | >5,500 Da |

## Research Applications

Peptides are studied across multiple disciplines for their unique biochemical properties:

- **Structural Biology**: Understanding protein folding and interaction mechanisms
- **Analytical Chemistry**: Developing novel detection and characterization methods
- **Materials Science**: Self-assembling peptide nanostructures
- **Bioinformatics**: Sequence analysis and structure prediction algorithms

See [[Solid Phase Peptide Synthesis]], [[Amino Acid Reference]], [[Mass Spectrometry]]