Indole-3-butyric acid
Indole-3-butyric acid (IBA), CAS 133-32-4, with molecular formula C12H13NO2 and a molecular weight of 203.24 g/mol, is a vital auxin-family plant hormone. It functions as a precursor to indole-3-acetic acid (IAA), the primary native auxin. IBA is widely recognised for its role in promoting root initiation and development, making it an indispensable tool in plant propagation and biotechnology.

Plant Growth Regulation
As a synthetic auxin, Indole-3-butyric acid is extensively used to stimulate root formation in cuttings and to promote root development in young plants. Its application is crucial in horticultural practices for vegetative propagation.
Plant Tissue Culture
IBA is a standard component in plant tissue culture media. It is used to induce callus formation and root development from explants, facilitating micropropagation and plant regeneration.
Molecular Biology Research
In molecular biology, IBA serves as a research tool to study plant hormone signalling pathways and their effects on plant growth and development at a molecular level.
Horticultural Applications
Beyond propagation, IBA can be applied to enhance fruit set and development in certain plant species, contributing to improved crop yields and quality.
| Molecular weight | 203.24 |
|---|---|
| Empirical formula | C12H13NO2 |
| Assay | ≥99.0% (T) |
| Application | Indole-3-butyric acid (IBA) is auxin-family plant hormone (phytohormone). IBA is thought to be a precursor of indole-3-acetic acid (IAA) the most abundant and the basic auxin natively occurring and functioning in plants. IAA generates the majority of auxin effects in intact plants, and is the most potent native auxin. |
| Melting point | 122-125 °C |

Hazard statements
- H301Toxic if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P301IF SWALLOWED
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 25-36/37/38 |
| Safety statements (S) | 26-36-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Indole-3-butyric acid used for?
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Indole-3-butyric acid (IBA) is primarily used as a plant growth regulator, specifically to stimulate root initiation in cuttings and to aid root development in plant tissue culture and horticulture.
What are the CAS number and formula for Indole-3-butyric acid?
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The CAS number for Indole-3-butyric acid is 133-32-4, and its molecular formula is C12H13NO2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Indole-3-butyric acid with an assay of ≥99.0% (T). This is a high-purity chemical suitable for research and technical applications. It is not supplied as USP, BP, or EP grade.
How should Indole-3-butyric acid be handled safely?
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Indole-3-butyric acid is labelled with 'Danger' and poses hazards including acute toxicity if swallowed (H301), skin irritation (H315), eye irritation (H319), and respiratory irritation (H335). Always use appropriate personal protective equipment, including eyeshields, face shields, gloves, and P2 respirator cartridges, in a well-ventilated area. Refer to the Safety Data Sheet for full handling instructions.
How is Indole-3-butyric acid packed and shipped?
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Indole-3-butyric acid is shipped as a regulated hazardous material (UN 2811 6.1 / PGIII). TSS exports chemicals globally, adhering to all relevant transportation regulations for safe and compliant delivery.
How can I request a sample or quote for Indole-3-butyric acid?
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To request a sample or a quotation for Indole-3-butyric acid, please contact our sales department via the website or direct email, providing your specific requirements.
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