Mol. wt. 346.4 M.f. C19H22O6 Form Crystalline solid. M.p. 223-225 ºC (ATXht98140 decomp.ATXht0 ) Solubility In water 5 g/l (room temperature). Soluble in methanol, ethanol, acetone, and aqueous alkalis; slightly soluble in diethyl ether and ethyl acetate. Insoluble in chloroform. Potassium, sodium, and ammonium salts: Readily soluble in water (potassium salt 50 g/l). Stability Dry gibberellic acid is stable at room temperature, but slowly undergoes hydrolysis in aqueous or aqueous-alcoholic solutions, ATXht98145 DT50 (20 ºC) c.ATXht0 14 d (ATXht981151 pHATXht0 3-4), 14 d (ATXht981151 pHATXht0 7). In alkalis, undergoes a rearrangement to less biologically-active compounds. Decomposed by heat.
Mode of Action:
Acts as a plant growth regulator on account of its physiological and morphological effects in extremely low concentrations. Translocated. Generally affects only the plant parts above the soil surface.
Oral Acute oral ATXht981113 LD50 for rats and mice >15 000 ATXht981123 mgATXht0 /ATXht981107 kgATXht0 .
Skin and eye Acute percutaneous ATXht981113 LD50 for rats >2000 ATXht981123 mgATXht0 /kg. Non-irritating to skin and eyes.