Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
1. Basic Information
Name: Indole-3-Acetic Acid
Abbreviation: IAA
Alias: 3-Indoleacetic acid, Heteroauxin
CAS No.: 87-51-4
Molecular Formula: C10H9NO2
Molecular Weight: 175.19
2. Physical and Chemical Properties
Physical Properties
- Appearance: White to pale yellow crystalline powder
- Odor: Faint characteristic indole odor
- Solubility: Slightly soluble in cold water, soluble in hot water, ethanol, methanol, acetone, ether; insoluble in benzene, petroleum ether
- Melting Point: 168–170 °C (decomposes slightly)
- Hygroscopicity: Slightly hygroscopic under high humidity
- UV Feature: Distinct ultraviolet absorption peak in alcoholic solution
Chemical Properties
- Molecular structure: Aromatic heterocyclic carboxylic acid containing indole ring and acetic acid side chain
- Acid-base characteristic: Weak organic acid, reacts with alkalis to form water-soluble indole acetate salts
- Photodegradation: Extremely sensitive to UV and strong light; rapid oxidation discoloration under illumination, loses plant growth regulating activity
- Oxidation reaction: Easily oxidized by air, hydrogen peroxide and strong oxidants to form brown indole oxidation polymers
- Thermal stability: Stable below 120 °C; long-term heating above melting point triggers decarboxylation and ring destruction
- Compatibility: Compatible with neutral organic solvents and most agricultural auxiliaries; incompatible with strong oxidants, concentrated alkali and heavy metal ions
3. Main Application Fields
1. Plant Growth Regulator (Core Application)
- Endogenous auxin plant hormone, promotes plant rooting, cell elongation, flower and fruit development
- Widely used in cutting seedling rooting, fruit setting, seed germination and crop growth regulation
- Raw material for agricultural foliar fertilizer and rooting agent formulations
2. Biochemical Laboratory Reagent
- Standard reference for plant hormone extraction and HPLC quantitative detection
- Substrate for auxin signal pathway research in plant cell culture experiments
3. Fine Chemical Intermediate
Building block for synthesizing indole-derived pharmaceutical and pesticide molecules
4. Quality Specification Table
| Test Item | Standard Index |
| CAS Number | 87-51-4 |
| Molecular Formula | C10H9NO2 |
| Molecular Weight | 175.19 |
| Appearance | White crystalline powder |
| HPLC Purity | Agri Grade ≥98.0%; Reference Standard ≥99.5% |
| Water Content (KF) | ≤0.30% |
| Residue on Ignition | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Arsenic (As) | ≤2 ppm |
| Packaging | Nitrogen-filled amber aluminum foil vacuum bag / 25kg PE-lined fiber drum |
| Storage Condition | Hermetic, light-proof cool dry warehouse below 25 °C; strictly avoid sunlight and damp air |
| Transportation Requirement | Light-sensitive plant hormone solid, light-resistant sealed packaging |
| Shelf Life | 24 months under intact nitrogen-filled light-proof vacuum packaging |
Safety Warning
Dust irritates respiratory tract, eyes and skin. High concentration liquid has phytotoxicity to crops. All operations must be carried out in ventilated fume hood with dust mask and chemical-resistant gloves. Strictly store away from light and oxidants to prevent inactivation.
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