Overview
Lipoic acid is an organosulfur compound derived from octanoic acid that plays a crucial role in mitochondrial metabolism as a coenzyme. Discovered in 1951, it exists in two enantiomeric forms (R and S), with the R-form being biologically active in humans. Unlike other antioxidants, lipoic acid is both water- and fat-soluble, allowing it to work in all cellular environments. Industrial production typically involves chemical synthesis, though some manufacturers employ biotechnological methods. The compound's unique ability to regenerate other antioxidants like vitamin C and E has made it valuable in nutritional science and anti-aging formulations. In B2B markets, lipoic acid is traded as raw material for supplement manufacturers, pharmaceutical companies, and cosmetic formulators.
Physical and Chemical Properties
Lipoic acid appears as a yellow crystalline powder with a characteristic sulfurous odor at higher concentrations. Its amphipathic nature stems from the carboxyl group (hydrophilic) and dithiolane ring (hydrophobic). The compound undergoes reversible redox reactions between its reduced (dihydrolipoic acid) and oxidized forms, which underlies its biochemical functions. Thermal stability is moderate, with decomposition beginning around 160°C. The R-enantiomer demonstrates higher melting point and greater biological activity compared to the S-form. In solution, lipoic acid shows pH-dependent stability, being most stable in slightly acidic conditions (pH 4-6). These properties dictate formulation strategies for end products, particularly in oral dosage forms where enteric coating may be required.
Main Applications
In pharmaceuticals, lipoic acid is primarily used for diabetic neuropathy treatment in several European countries, typically in daily doses of 600mg. The U.S. FDA has granted it orphan drug status for this indication. Supplement manufacturers utilize it in antioxidant blends, energy metabolism formulas, and detoxification products, often combined with coenzyme Q10 or acetyl-L-carnitine. The cosmetic industry values lipoic acid for its anti-aging properties, incorporating it into serums and creams at concentrations of 1-5%. Industrial applications include use as a reducing agent in certain chemical processes. Emerging research explores its potential in neurodegenerative diseases and metabolic syndrome, though these applications remain in clinical trial stages.
Safety and Storage
Lipoic acid is generally recognized as safe (GRAS) for oral consumption at recommended doses, though high doses (>1200mg/day) may cause nausea or skin rash. Occupational exposure requires standard personal protective equipment as the powder may irritate eyes and respiratory tract. Proper storage is critical to maintain stability. Bulk material should be kept in original, light-resistant containers under nitrogen atmosphere when possible. Shelf life typically ranges from 2-3 years when stored at controlled room temperature, extending to 4 years with refrigeration. Stability indicating HPLC methods should be used for quality control, monitoring for oxidation products and enantiomeric purity.
B2B Procurement Guide
When sourcing lipoic acid, buyers should prioritize suppliers who provide comprehensive documentation including Certificate of Analysis (specifying enantiomeric ratio), residual solvent reports, and heavy metal testing results. Pharmaceutical-grade material should comply with USP/EP monographs where applicable. For supplement manufacturing, verify whether the supplier offers vegetarian/vegan-certified material if required for product positioning. Consider minimum order quantities (typically 25-100kg) and lead times, which may extend to 8-12 weeks for custom enantiomeric ratios. Some buyers opt for sodium-R-lipoate derivatives for improved solubility in certain formulations. Always audit supplier GMP compliance and request stability data under proposed storage conditions.
Related Manufacturers
- 主营：聚苯胺、脯氨酸甲酯盐酸盐、苄基三甲基氯化铵
- 主营：离子液体、阻燃剂、咪唑、全氟辛基三甲氧基硅烷、硫酸烟酰苯胺、丙酮缩氨基硫脲、催化剂、乙酰丙酮钴、正丁醇锆、四氟硼酸锂、香兰基丁醚、氟化物、丙酮肟、双酚E型氰酸酯、叔丁基乙烯基醚、钯碳催化剂、钛硅分子筛
- 主营：红色素-16、聚乙烯亚胺、巯基苯并噻唑钠、三硫代碳酸钠、三乙二醇二异辛酸酯、L-丙交酯、乙交酯、石油酯-T50、多元醇苯甲酸酯、热压敏染料、光稳定剂、高分子降解材料
- 主营：环戊酮、甲酸镍、阻燃剂、异硫氰酸烯丙酯、草酸镧、钼酸铵、催化剂、钒酸铋、溴氨酸、硝酸锆、碳酸镧、白僵菌、磷酸铁、钨酸酐、氟化镧、视黄醇、叔丁醇、杀螨剂、杀虫剂、醋酸钬、抗粘剂、氟化镥、肟菌酯、氢化钠、氯铂酸、氟化镁
- 主营：杜仲素、对位酯、丙烯酸酯、二氧化硫脲、乙基麦芽酚、饲料添加剂、油酸基硬脂酸、二苯基硅二醇
- 主营：5-二甲基吡唑、N-油酰基肌氨酸、环己基苯、硫酸烟酰苯胺、2-辛烯基琥珀酸酐、辛酸镁、辛酸钾、β-溴苯乙烷、乙基纤维素、菜籽油甲酯、5二硝基水杨酸、有机硅季铵盐、萘钠处理液
- 主营：氯菊酯、转移剂、聚酯树脂、二甲氧基、驱蚊原液、食品香料、缩水甘油酯、蚊香增效剂、丙烯酸缩水、环氧稀释剂、硅烷偶联剂、超疏水材料、对甲氧基苯酚、对羟基苯甲醚、乙烯基双封头、苯基缩水甘油醚
- 主营：二氯辛酸乙酯、导电漆、五氧化二钒、漂粉精
- 主营：ELISA试剂盒、PCR试剂盒、生化试剂盒、科研试剂
- 主营：黄原胶、一水柠檬酸、瓜尔豆胶、木糖醇、维生素C、魔芋胶、乳清蛋白粉
- 主营：标准品、植物提取物、理化实验仪器
- 主营：化学试剂、生物试剂、分析试剂、硫辛酰氨基、基准试剂、生化试剂
- 主营：三聚甲醛、四甲基氢氧化胺、双季戊四醇、硫氢化钠、聚硫橡胶、双乙烯酮、异丙叉丙酮、十一烷、甲基丙烯酸十八酯、四甲基氢氧化铵五水合物、水杨羟肟酸、异己二醇、苯甲羟肟酸、甲基纤维素、环氧环己烷、硬脂酸乙二醇单酯、邻氯溴苯、二苯甲酮BP、氨基磺酸、均苯四甲酸二酐、月桂酸钠、吐温、司盘
- 主营：硫辛酰胺、分析纯试剂
- 主营：丹皮酚、有成中、中间体、硫酸铯、邻氟苯腈、聚季铵盐、二萘磺酸、硒氰酸钾、仲丁基锂、四乙酸铁、卡非佐米、亚甲基双、间溴苯腈、二氯苯乙酮、萘磺酸二钠、更昔洛韦钠、二胺四乙酸、乙酸二钠盐、5-二溴苯酚、4'-二溴联苯、邻氯苯甲酰胺、酮十一烯酸酯、阿昔洛韦侧链、无机标准物质、5-三氯吡啶