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Indole-3-acetic acid

Chemical Name:
Indole-3-acetic acid
IAA;INDOLEACETIC ACID;2-(1H-INDOL-3-YL)ACETIC ACID;3-INDOLEACETIC ACID;Gap;HETEROAUXINE;indole-3-acetic;indolyl-aceticaci;Indolylacetic acid;Indole-3-acetic acid (3-IAA)
Molecular Formula:
Molecular Weight:
MOL File:

Indole-3-acetic acid Properties

Melting point 165-169 °C (lit.)
Boiling point 306.47°C (rough estimate)
Density 1.1999 (rough estimate)
refractive index 1.5460 (estimate)
Flash point 171°C
storage temp. -20°C
pka 4.75(at 25℃)
form crystalline
color off-white to tan
Water Solubility Soluble in ethanol (50 mg/ml), methanol, DMSO, and chloroform (sparingly). Insoluble in water.
Sensitive Light Sensitive
Decomposition 167 ºC
Merck 14,4964
BRN 143358
Stability Stable. Incompatible with strong oxidizing agents. Light sensitive.
CAS DataBase Reference 87-51-4(CAS DataBase Reference)
NIST Chemistry Reference Indole-3-acetic acid(87-51-4)
EPA Substance Registry System Indole-3-acetic acid (87-51-4)


Risk and Safety Statements

Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  22-24/25
WGK Germany  3
RTECS  NL3150000
Hazard Note  Irritant
HS Code  29339990
Toxicity LD50 intraperitoneal in mouse: 150mg/kg

Indole-3-acetic acid price More Price(45)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich I3750 3-Indoleacetic acid 98% 87-51-4 5G $25.3 2022-05-15 Buy
Sigma-Aldrich I3750 3-Indoleacetic acid 98% 87-51-4 25g $78.3 2022-05-15 Buy
Sigma-Aldrich I3750 3-Indoleacetic acid 98% 87-51-4 100g $229 2022-05-15 Buy
Sigma-Aldrich I2886 3-Indoleacetic acid plant cell culture tested, crystalline 87-51-4 5g $31.5 2022-05-15 Buy
Sigma-Aldrich 45533 3-Indoleacetic acid PESTANAL , analytical standard 87-51-4 250mg $48.8 2022-05-15 Buy
Product number Packaging Price Buy
I3750 5G $25.3 Buy
I3750 25g $78.3 Buy
I3750 100g $229 Buy
I2886 5g $31.5 Buy
45533 250mg $48.8 Buy

Indole-3-acetic acid Chemical Properties,Uses,Production

Chemical Properties

white to tan crystals


Plant growth regulator.


It is applied as plant growth hormone. is an inducer of plant cell elongation and division shown to cause uncontrolled growth.


ChEBI: A monocarboxylic acid that is acetic acid in which one of the methyl hydrogens has been replaced by a 1H-indol-3-yl group.


3-Indolylacetic acid is biosynthesised in plants from tryptophan by two pathways, the indolylpyruvic acid pathway being quantitatively the more important. Experiments with tomato shoots have shown the existence of a tryptophan transaminase, which catalyses the formation of indolylpyruvic acid, and a tryptophan decarboxylase, which catalyses the formation of tryptamine. The decarboxylation of indolylpyruvic acid is catalysed by indolylpyruvate decarboxylase, while indolylacetaldehyde dehydrogenase catalyses the oxidation of indolylacetaldehyde to indolylacetic acid.
The biosynthesis of 3-indolylacetic acid
The biosynthesis of 3-indolylacetic acid

Biological Functions

3-Indolylacetic acid (indole-3-acetic acid, IAA) is one of the auxins, which together with the gibberellins and abscisic acid, cyto- kinins and ethylene are hormones regulating the growth and development of plants. IAA is a ubiquitous constituent of higher plants and the most important auxin. Some other, non-indolic compounds, including phenyl- acetic acid biosynthesised in plants from phenylalanine, have similar properties and synthetic auxins have also been prepared.
In the plant, IAA conjugates with many compounds, including glucose and other sugars, and with aspartic and glutamic acids. This is probably a way of storing the hormone for future use.
IAA initiates many growth effects in plants, including geotropism and phototropism, development of the ovary, division of cells, enlargement in callus tissue, root formation and apical dominance. When fed to plants, the hormone causes growth up to a maximum, which depends on the type of tissue being fed, and thereafter inhibits further growth, probably through the formation of ethylene, which is growth-inhibitory. Stern tissues tolerate the highest levels of IAA and root tissues the lowest. In the plant, the most active sites of IAA synthesis are the young, expanding leaves.

General Description

3-Indoleacetic acid is a highly effective, growth promotor in lower plant life, formed by a variety of fungi, including yeast and has been isolated from Aspergillus niger and Rhizopus sp. It is commonly employed in horticulture and industry.

Agricultural Uses

Indoleacetic acid (IAA), synthesized in the plant shoot tips, is a naturally occurring auxin. It is a plant growth promoter.

Purification Methods

Recrystallise heteroauxin from EtOH/water [James & Ware J Phys Chem 89 5450 1985]. [Beilstein 22 III/IV 65.] Alternatively recrystallise 30g of the acid with 10g of charcoal in 1L of hot water, filter and cool when 22g of colourless acid separate. Dry it and store it in a dark bottle away from direct sunlight [Johnson & Jacoby Org Synth Coll Vol V 654 1973]. The picrate has m 178-180o. [Beilstein 22 H 66, 22 I 508, 22 II 50, 22 III/IV 1088.] It is a plant growth substance.

Indole-3-acetic acid Preparation Products And Raw materials

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View Lastest Price from Indole-3-acetic acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2022-06-23 Indole-3-acetic acid
US $0.00-0.00 / kg 1kg 99% 5000kg Hebei Mojin Biotechnology Co., Ltd
2022-04-26 Indole-3-acetic acid
US $1.00 / kg 1kg 99% 1 tons Jiangsu Bangdeya New Material Technology Co.,Ltd
2021-12-01 Indolyl Acetic Acid
US $1.90 / KG 1KG 99% 10 ton Hebei Crovell Biotech Co Ltd
2,3-dihydro-1H-indol-3-ylacetic acid indolyl-aceticaci Kyselina 3-indolyloctova kyselina3-indolyloctova omega-Skatole carboxylic acid omega-skatolecarboxylicacid Rhizopon A Rhizopon A, AA rhizopona Skatole carboxylic acid INDOLE-3-ACETIC ACID PLANT CELL CULTURE TESTED 3-INDOLYLACETIC ACID PESTANAL, 250 MG 2-(INDOLIN-3-YL)ACETIC ACID Indole-3-acetic acid (3-IAA) 3-IndoleaceticAcid,Indole-3-AceticAcid Indole-3-AceticAcidForBiochemistry Indole-3-acetic acid, 98+% IAA,3-Indoleaceticacid 1H-Indole-3-acetic acid, 99+% INDOLE-3-ACETICACID,(IAA)98%(BULK Indol-3-ylacetic acid 98% 3-INDOLEACCETIC ACID(IAA) INDOLACETICACID 4-(INDOL-3-YL)ACETICACID Indole-3-acetic acid horticultural grade, 99% INDOLE-3-ACETIC AICD IAA, 3-Indoylacetic acid Indole-3-acetic acid solution (1 mg/mL) INDOLE-3-ACETIC ACID SOLUTION Indol-3-accetic acid Indole-3-acetic acid in stock Factory RHIZOPIN RARECHEM AL BO 0204 HETEROAUXINE HETEROAUXIN SODIUM SALT HETEROAUXIN HETERAUXIN INDOLYL-3-ACETIC ACID INDOLEACETIC ACID INDOLE-3-ACETIC ACID SODIUM SALT INDOLE-3-ACETIC ACID INDOL-3-YLACETIC ACID IAA SODIUM SALT IAA JAA LABOTEST-BB LT00044476 2-(1H-INDOL-3-YL)ACETIC ACID 1H-INDOLE-3-ACETIC ACID (1H-INDOL-3-YL)-ACETIC ACID 3-INDOLEACETIC ACID 3-INDOLYLACETIC ACID Indole-3-acetic acid,(Heterauxin Indole-3-acetic Acid (1.00353) Indole-3-acetic acid IAA AKOS NCG1-0097 INDOLE-3-ACETIC ACID pure Heteroauxin, IAA 3-Indolylmethylcarboxylic acid