Overview
Calcium formaldehyde fixative is a specialized chemical solution primarily used in biological and medical fields for tissue preservation. It combines the cross-linking properties of formaldehyde with calcium ions, which helps maintain cellular structure integrity during fixation. This dual-action formula prevents tissue autolysis and bacterial decomposition while preserving cellular morphology for microscopic examination. The fixative is particularly valued in histopathology and research laboratories where maintaining tissue architecture is crucial for accurate diagnosis and study. Its formulation typically includes buffered formaldehyde solution with added calcium salts, creating a balanced preservation medium that works effectively at room temperature.
Physical and Chemical Properties
Calcium formaldehyde fixative appears as a clear, colorless to slightly yellow liquid with a characteristic pungent odor. The solution is typically aqueous-based with formaldehyde concentrations ranging from 4% to 10%, combined with calcium chloride or calcium acetate. The calcium component helps stabilize certain cellular components, particularly membrane structures, during the fixation process. The solution has a slightly alkaline pH (approximately 7.2-7.6) when properly buffered, which helps prevent tissue swelling and maintains optimal fixation conditions. Its density is slightly higher than water due to the dissolved components. The fixative is miscible with water and most alcohols, but incompatible with strong oxidizers and acids.
Main Applications
The primary application of calcium formaldehyde fixative is in histopathology laboratories for preserving tissue specimens obtained through biopsies or autopsies. It's particularly effective for preserving delicate tissues such as brain, kidney, and liver specimens where cellular detail must be maintained for accurate diagnosis. The calcium component helps prevent the extraction of phospholipids during processing. In research settings, this fixative is used for electron microscopy preparations, immunohistochemistry studies, and long-term storage of biological specimens. Its balanced formulation makes it suitable for preserving both soft and hard tissues, though fixation times may vary depending on tissue thickness and type.
Safety and Storage
Calcium formaldehyde fixative requires careful handling due to its corrosive nature and potential health hazards. Always use in well-ventilated areas or fume hoods, and wear appropriate personal protective equipment including gloves, goggles, and lab coats. Formaldehyde vapors can be irritating to eyes and respiratory tract, and prolonged exposure may have more serious health effects. For storage, keep containers tightly sealed in cool (15-25°C), dry conditions away from direct sunlight and heat sources. The solution should be stored in chemically resistant containers, preferably made of polyethylene or glass. Shelf life is typically 12-24 months when stored properly, though the solution should be checked for precipitation or color changes before use.
B2B Procurement Guide
When procuring calcium formaldehyde fixative in bulk for laboratory or medical use, several factors should be considered. First, verify the formaldehyde concentration and calcium content to ensure compatibility with your specific applications. Reputable suppliers should provide certificates of analysis and material safety data sheets. Consider purchasing pre-buffered solutions to ensure consistent pH levels, which is critical for optimal fixation. For large-volume users, concentrate formulations that can be diluted on-site may offer cost savings. Establish proper storage facilities before procurement, and consider supplier reliability, delivery schedules, and technical support capabilities. Some suppliers offer customized formulations for specialized applications.
Related Manufacturers
- 主营：透析袋、移液器、SIGMA、麦格中性甲醛钙固定液、赛默飞、爱思进、吸头/枪头、离心管、巴氏吸管、保存管、封板膜、细胞爬片、滤器、ELISA试剂盒
- 主营：透析袋、移液器、SIGMA、麦格中性甲醛钙固定液、赛默飞、爱思进、康宁、离心管、巴氏吸管、保存管、封板膜、细胞爬片、滤器、ELISA试剂盒
- 主营：生物dna、dna病毒、dna回收、甲醛钙固定液、植物dna、dna产物、基因组dna、小提试剂盒、提取试剂盒、两步法细菌、离心柱式血液、酵母质粒提取、蛋白浓度测定、细胞增殖检测
- 主营：D-荧光素钾、D-荧光素钠、缓冲液、中性甲醛钙固定液、裂解液、脲酶Urease、刀豆凝集素ConA、黄嘌呤氧化酶、胰α淀粉酶、β-葡萄糖苷酶、辣根过氧化物酶、植物检测试剂盒、tRNA转运核糖核酸、胰蛋白酶抑制剂、乙酰胆碱酯酶、L-乳酸脱氢酶、过氧化氢酶、葡萄糖氧化酶、肝素钠、福林酚、三羟甲基氨基甲烷、二硫苏糖醇DTT、苏木色精、伊红Y(曙红)、乙基紫、土壤检测试剂盒
- 主营：培养基、动物红细胞、原代细胞、中性甲醛钙固定液、细胞系、Elisa试剂盒
- 主营：叔丁酯、银杏叶、灭菌磷、水中钙、檀香醇、磺酰基、庚烯酮、分散蓝、异丁酯、乙霉威、霜霉威、3681-82-1、水中氟、子烯酮、野菊花、西洋参、氟苯基、芫根苷、甲氨基、唑螨酯、洋艾素、denhardts、独活素、苯基芴、水中钡
- 主营：洗涤剂、抗静电剂、工业洗涤、气相色谱固定液、保湿乳化剂、热熔胶树脂、表面活性剂
- 主营：pet胶带、玻璃布胶带、绿色高温胶带、绿色pet胶带、金手指胶带、聚酰亚胺胶带、Pet保护膜、耐高温保护膜、耐高温胶带、等离子喷涂胶带
- 主营：异丙醇、冰醋酸、化工原料、正庚烷、甲基环己烷、乙二醇、苯酚、江苏异丙醇、江苏化工原料、工业吡啶、工业苯酚、正丁醇、MIBK、无水乙醇、正己烷
- 主营：阻燃剂、催化剂、水杨酸、作气相色谱固定液、二苯基、酰亚胺、正磷酸、烟酰胺、曲酸粉、氯化锌、异丙醇、化妆品、初油酸、脂肪醇、生石灰、甲基异、碳酸锌、碳酸锂、活性炭、乙二胺、三氮唑、着色剂、环己酮、防冻液、抗氧剂、亚磷酸
- 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：120号溶剂油、150号溶剂油、200号溶剂油、260号溶剂油、白油、D40溶剂油、D60溶剂油、D80溶剂油、D130溶剂油、磺化煤油、丙二醇、对甲苯磺酰氯、莫卡、聚乙二醇、二茂铁、石蜡、乙二醇、铝粉膏、抗氧剂T501、甲基丙烯酸缩水甘油酯、甲基叔丁基醚、乙二醇丁醚、甲缩醛、石脑油、正十四烷
- 主营：甘油、食品级甘油、工业级甘油、脂肪酸、月桂酸、肉豆蔻酸、硬脂酸、油酸、棕榈酸、脂肪醇、十六醇、十八醇、8醇、10醇、8/10醇、12醇、1618醇、22醇、22酸、芥酸、山嵛酸、油酸甲酯、棕榈酸甲酯、月桂酸甲酯
- 主营：食品添加剂、工业印染助剂保险粉、雕白块吊白粉、气相色谱固定液、五氧化二钒、工业及食品及片碱粒碱、电镀原料、污水处理剂、消毒剂、洗涤原料、英轩柠檬酸系列、葡萄糖、重金属捕捉剂、石油助剂、水溶农用肥料、表面活性剂、过碳酸钠、电镀催化剂
- 主营：四氢噻吩、乙硫醇、二甲基亚砜、二甲基二硫、正辛硫醇、百里香酚、氟化铯、乙硫氨酯、四水合乙酸钴、二异丁基酮、乳酸乙酯、正己烷、2-甲基吡啶、环氧氯丙烷、对氯间甲酚、亚磷酸三苯酯、环丁砜、甲基丙烯酸甲酯、二乙烯基苯、四氯化锆、二氧六环、氯化锂、硫酸锂
- 主营：黄丹粉、柠檬酸、导热油、氯化钙、漂白粉、707乳液、氧化铝、木质素、防腐剂、除锈剂、防锈剂、酒石酸、抗氧剂、松香工业、碳酸氢铵、醋酸铅、碳酸铅
- 主营：福美钠、五氧化二钒、氨基磺酸、次氯酸钙、氟化钙、氨基化锂、焦性没食子酸、漂粉精、酪蛋白胨、甘油、九水硫化钠、牛油脂肪酸、酵母膏、氟硅酸钠、单乙醇胺、氢氧化钾、氟化钠、氧化铅、油酸钠、偏钒酸铵、氢氧化钡、EVA乳液、二硫化钼、氟化氢钾
- 主营：4-D钠盐、N-甲基硫脲、N-甲基吡咯烷酮、单辛酸甘油酯、N-甲基邻氨基苯甲酸甲酯、三硫代碳酸钠、辛酸镁盐、菜籽油甲酯、8-辛二醇、羟丙基纤维素、硫酸烟酰苯胺、离子液体、咪唑、表面活性剂、光引发剂、紫外线吸收剂、UV单体
- 主营：蛋白栋、DOP、玻璃粉、福美钠、黄糊精、硫酸钡、漂白粉、漂粉精、强氯精、优氯净、早强剂