Overview
Abscisic acid (ABA) is a critical plant hormone primarily involved in stress adaptation and growth regulation. Discovered in the 1960s, it plays a central role in abiotic stress responses (e.g., drought, salinity) by triggering stomatal closure and inducing dormancy in seeds and buds. Unlike growth-promoting hormones like auxins, ABA acts as an inhibitor, making it vital for plant survival under adverse conditions. In commercial agriculture, synthetic ABA analogs are increasingly used to improve crop resilience. The compound’s chiral structure (naturally occurring as (+)-ABA) influences its bioactivity, with most industrial applications utilizing racemic mixtures or stabilized formulations for cost-effectiveness.
Physical and Chemical Properties
Abscisic acid is a sesquiterpenoid with a molecular weight of 264.32 g/mol. Its crystalline form is stable under refrigeration but degrades when exposed to UV light or high temperatures. The carboxyl group at C1 makes it weakly acidic (pKa ~4.8), facilitating solubility in alkaline solutions. Notably, ABA exhibits photoisomerization, where the 2-cis,4-trans form is biologically active, while the trans-isomer is inactive. This property necessitates careful storage in opaque containers. Its melting point (160-163°C with decomposition) precludes distillation, requiring synthesis via chemical or microbial fermentation routes.
Main Applications
In agriculture, ABA is applied to enhance drought tolerance by reducing transpiration via stomatal regulation. Seed coating with ABA improves uniformity in germination, particularly for crops like wheat and rice. Horticulturists use it to extend the dormancy of nursery plants during transport. The pharmaceutical and cosmetic industries explore ABA for its anti-inflammatory properties, though applications remain experimental. Research-grade ABA (≥99% purity) is essential for studies on plant signaling pathways, often used in concentrations of 10-100 μM for laboratory assays.
Safety and Storage
ABA is classified as low-toxicity (LD50 >5,000 mg/kg in rats) but may irritate eyes and skin. Proper gloves (nitrile) and goggles are recommended when handling powders. Spills should be neutralized with sodium bicarbonate and disposed of as organic waste. Long-term storage requires desiccants and inert atmospheres (e.g., argon) to prevent oxidation. Commercial formulations often include stabilizers like BHT (butylated hydroxytoluene) to extend shelf life beyond 2 years at 4°C. Transport typically follows UN3077 (environmentally hazardous substances) guidelines.
B2B Procurement Guide
Bulk buyers should prioritize suppliers offering HPLC-certified purity levels (≥95% for field use, ≥98% for research). Agricultural formulations often combine ABA with adjuvants like glycerol to improve leaf penetration; verify compatibility with existing farm chemicals. Spot prices fluctuate seasonally, with discounts common for orders exceeding 1 kg. Chinese manufacturers dominate production, but EU/US buyers must confirm REACH or EPA compliance. Sample testing for isomer ratio (active cis-form ≥80%) is advised before large purchases.
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