Overview
Topramezone is a systemic herbicide first registered in 2005, belonging to the benzoylcyclohexanedione chemical class. It functions as a potent inhibitor of 4-hydroxyphenylpyruvate dioxygenase (HPPD), an enzyme critical for carotenoid biosynthesis in plants. The compound demonstrates exceptional selectivity for corn crops while effectively controlling over 46 broadleaf weed species. As a post-emergence herbicide, topramezone is absorbed primarily through foliage with limited root uptake. Its unique mode of action makes it valuable for managing herbicide-resistant weed populations. The global market for topramezone has grown steadily due to increasing demand for selective corn herbicides with favorable environmental profiles.
Physical and Chemical Properties
Topramezone presents as a white to off-white crystalline powder with a molecular weight of 383.36 g/mol. It exhibits moderate thermal stability with a melting point range of 195-197°C. The compound's low water solubility (2.2 mg/L at 20°C) contributes to its soil residual activity while minimizing leaching risks. Chemically, topramezone contains a trifluoromethyl group and sulfonyl moiety that enhance its herbicidal activity. The substance shows good stability under normal storage conditions but may degrade when exposed to strong acids or bases. Its vapor pressure is negligible (1.6×10-9 Pa at 25°C), indicating low volatility in field applications.
Main Applications
Topramezone is primarily formulated as a suspension concentrate (SC) or wettable powder (WP) for agricultural use. Field application rates typically range from 12.5-25 g a.i./ha, often combined with safeners to enhance corn tolerance. The herbicide shows particular efficacy against troublesome weeds such as velvetleaf, morning glory, and pigweed. In integrated weed management systems, topramezone is frequently tank-mixed with atrazine or mesotrione to broaden the spectrum of control and delay resistance development. Some formulations combine topramezone with cyprosulfamide safener to improve crop selectivity. The compound's rainfastness occurs within 1-4 hours post-application, making it suitable for regions with unpredictable rainfall.
Safety and Storage
Topramezone is classified as harmful if swallowed (H302) and causes serious eye irritation (H319). Applicators must wear chemical-resistant gloves, protective eyewear, and long-sleeved clothing during handling. The herbicide demonstrates low acute toxicity to birds and mammals but shows moderate toxicity to aquatic organisms. Proper storage requires keeping containers tightly closed in a well-ventilated area at temperatures below 30°C. Bulk quantities should be stored on pallets away from floor walls to prevent moisture absorption. Shelf life typically exceeds 2 years when stored in original packaging under recommended conditions. Spills should be contained with inert absorbent materials and disposed of according to local regulations.
B2B Procurement Guide
When sourcing topramezone, buyers should verify the technical material meets FAO/WHO specifications (minimum 95% purity). Reputable suppliers provide batch-specific Certificates of Analysis including HPLC purity, moisture content, and impurity profiles. Current market prices range approximately $80-$120/kg for technical grade material, with discounts available for multi-ton purchases. Procurement professionals should confirm the supplier holds valid ISO 9001 certification and Good Manufacturing Practice compliance. Transportation typically requires UN3077 (environmentally hazardous substance) labeling for international shipments. Consider requesting sample quantities for efficacy testing before large-scale procurement, particularly when switching suppliers or geographic sources.
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