A4906 Sigma-Aldrich

(+)-Abscisic acid

≥98% (HPLC)

Synonym: (S)-5-(1-Hydroxy-2,6,6-trimethyl-4-oxo-2-cyclohexen-1-yl)-3-methyl-(2Z,4E)-pentadienoic acid, ABA, Dormin

  • CAS Number 21293-29-8

  • Empirical Formula (Hill Notation) C15H20O4

  • Molecular Weight 264.32

  •  Beilstein Registry Number 2698956

  •  EC Number 244-319-5

  •  MDL number MFCD00066545

  •  PubChem Substance ID 24890921



Biochem/physiol Actions

Plant hormone and growth regulator that is involved in several physiological mechanisms including seed dormancy, leaf abscission, stomatal movement, and plant stress responses. Through complex interactions with several intracellular signaling systems, it can regulate the expression of hundreds of plant genes.

Other Notes

Natural isomer of the abscission-accelerating plant hormone.


1 mg in glass bottle

250 μg in glass bottle


(+)-Abscisic acid is a plant hormone and growth regulator involved in several physiological mechanisms including seed dormancy, leaf abscission, stomatal movement, and plant stress responses such as drought. Abscisic acid has been used in a study to learn about expression analysis of four peroxiredoxin genes from Tamarix hispida.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

How does the storage temperature relate to shipping conditions?
The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment. See <A href="/content/dam/sigma-aldrich/docs/Sigma-Aldrich/General_Information/shipping-and-longterm-storage.pdf">Shipping and Storage</A> for more information.
Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
What solvents can be used with Product A4906, (+)-Abscisic acid?
Abscisic acid, Product No. A4906, is soluble in ethanol (10 mg/mL), yielding a clear, colorless solution. For plant cell culture, it can be solubilized in a small amount of 1 N NaOH and diluted with water or medium.
How is Product A4906, (+)-Abscisic acid, prepared?
This product is synthetic. This isomer is isolated from the racemic mixture.
How should Product A4906, (+)-Abscisic acid solutions be stored?
A solution of (+)-Abscisic acid should be stored in single use aliquots at -20°C.
What concentration of Product A4906, (+)-Abscisic acid, is used in plant cell culture?
(+)-Abscisic acid is used at 0.1 to 10 mg/L for plant cell culture.
How do I find price and availability?
There are several ways to find pricing and availability for our products.Once you log onto our website, you will find the price and availability displayed on the product detail page.You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 orview local office numbers.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
My question is not addressed here, how can I contact Technical Service for assistance?
Ask a Scientist here.
Show more questions

Milli-Q® Water Purification Solutions
Protocols & Articles
Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?