Folcisteine, also known asN-Acetylthiazolidine-4-carboxylic acid, is a sulfur-containing heterocyclic compound with the molecular formula C₆H₉NO₃S and a molecular weight of 175.21 g/mol. As a specialized plant growth regulator and biochemical reagent, it features a unique thiazolidine ring structure with an acetyl group and a carboxyl group, endowing it with distinct biological activities and chemical stability.
Physically, Folcisteine appears as a white to off-white crystalline powder. It has a melting point of146–148 °C (decomposition) and a boiling point of approximately439 °Cat 760 mmHg. The compound is soluble in dimethyl sulfoxide (DMSO, ≥ 160 mg/mL) and has a water solubility of about 113.2 g/L at 20 °C, while being insoluble in most non-polar organic solvents. It exhibits a refractive index of1.58 and a density of1.427 g/cm³, with low hygroscopicity, making it easy to handle and formulate.
Chemically, Folcisteine is stable under neutral and weakly acidic conditions. Its core thiazolidine ring and acetylthio moiety enable it to participate in redox reactions and interact with biological macromolecules. It acts as a precursor for sulfur-containing metabolites and exhibits mild antioxidant properties, which contribute to its protective effects in biological systems.
In agriculture, Folcisteine is widely used as a plant growth regulator. It effectivelypromotes seed germination, accelerates cell division, and enhances crop growth, significantly increasing yields for wheat, rice, corn, and apples. Applied as a seed treatment powder or foliar spray (0.25–0.5 mg/L active ingredient), it improves stress resistance and fruit set rates. In biochemistry, it serves as a research tool for studying plant physiology, redox signaling, and radioprotection, as pre-administration shows protective effects against radiation damage.
Safety-wise, Folcisteine has low acute toxicity (rat oral LD₅₀ = 4.5 g/kg) and is generally non-irritating. It should be stored in a sealed, cool, dry, and dark environment (2–8 °C) to avoid oxidation and degradation. With its dual roles in agricultural production and scientific research, Folcisteine is a valuable and versatile compound in the fine chemical and life science industries.
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