Overview
Propionate Agar is a specialized microbiological growth medium containing sodium propionate as its active inhibitory component against bacteria. Developed for selective cultivation of yeasts and molds, it is widely adopted in food safety laboratories and quality control programs. The medium typically includes peptones as nitrogen sources, glucose for energy, and agar as a solidifying agent. Its acidic pH (~5.4) and propionate content create unfavorable conditions for most bacteria while allowing fungi to thrive. Standard formulations comply with ISO 21527 and FDA BAM Chapter 18 protocols.
Physical and Chemical Properties
The dry powder form has a shelf life of 2-3 years when stored properly. When prepared, the medium forms a translucent gel with slight opalescence. Sodium propionate (C3H5NaO2) dissociates in water to release propionic acid, which penetrates bacterial cell membranes more effectively at lower pH levels. Key chemical interactions include the inhibition of bacterial enzyme systems by undissociated propionic acid molecules. The medium maintains stability through autoclaving (121°C for 15 minutes), though prolonged heat exposure may degrade selective properties. Finished plates should demonstrate no significant color change or precipitation when stored at 2-8°C for up to 4 weeks.
Main Applications
Primary use cases include dairy product testing (cheese, yogurt), baked goods analysis, and processed food examinations where fungal contamination risks exist. Environmental monitoring programs in pharmaceutical facilities utilize propionate agar for air and surface sampling. In agricultural applications, the medium helps diagnose fungal infections in crops and stored grains. Some clinical laboratories employ modified versions for isolating dermatophytes. Recent adaptations incorporate chloramphenicol to enhance selectivity against antibiotic-resistant bacteria in complex samples.
Safety and Storage
While classified as non-hazardous under GHS, the powder form may generate airborne particles during handling. Laboratories should employ standard microbiological safety practices including work in laminar flow hoods for plate pouring. Unprepared media should be protected from humidity to prevent clumping. Prepared plates must be labeled with preparation date and batch number. Discard any medium showing discoloration, dehydration, or microbial growth. For disposal, autoclave used plates before incineration as biomedical waste.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 13485 certification for consistent quality. Request certificates of analysis for each batch, verifying growth promotion testing results for reference strains like Aspergillus brasiliensis ATCC 16404. Bulk purchases (25kg+) typically offer 15-30% cost savings. Consider pre-poured plates for high-throughput labs despite premium pricing (2-3x dry medium cost). Key evaluation criteria include gel strength (≥800 g/cm²), moisture content (<8%), and absence of bacterial contaminants in sterility testing.
Related Manufacturers
- 主营：培养基、培养皿、菌检测、马铃薯葡萄糖琼脂培养基、菌落计数器、水质检测、ms培养基、微生物检测仪器设备、接种环、微生物检验、微生物检测、程控定量封口机、支原体培养基、路桥培养基、三药培养基、海博培养基、菌种鉴定
- 主营：科研试剂、高效试剂
- 主营：研突破、转座酶、重组酶、连接酶、研试剂、(5×)(with、recombinant、结合蛋白、胶体染料、核酸染料、助力科研、大肠杆菌、泛素蛋白、实验室用品、重组肠激酶、电泳缓冲液、拓扑异构酶、热敏磷酸酶、检测试剂盒、全能核酸酶、核酸外切酶、核酸内切酶、连接试剂盒、碱性磷酸酶、微球菌核酸酶
- 主营：抗体、感受态、培养基、试剂盒、层析柱、填料、生物试剂、化学试剂
- 主营：马铃薯、增菌液、噬菌体、营养盐、琼脂粉、基础盐、血琼脂、串珠菌、西红柿、活性炭、营养液、酵母氮、酵母膏、磁螺菌、缓冲液、抑菌剂、培养基、氯化钠、玉米粉、三糖铁、洗脱液、中和剂、结冷胶、沉降菌、橄榄油
- 主营：感受态、扁桃体、淋巴管、TOS丙酸盐琼脂、干细胞、狗血浆、羊血浆、导管癌、原细胞、青霉素、营养液、无酚红、癌细胞、小细胞、胰腺癌、输尿管、抗凝鸡、缓冲液、鸭血清、猪血清、人韧带、培养基、肝素钠、牛血浆、马血清、白细胞
- 主营：回收油漆、回收树脂、回收橡胶助剂、大豆蛋白胨琼脂、回收油漆厂原料、回收橡胶、回收香精、回收热熔胶
- 主营：琼脂厂家、植提专用酶、防腐剂系列、增稠剂系列
- 主营：净化检测仪器、空气净化设备
- 主营：阿斯巴甜、赤藓糖醇、菊粉、琼脂、结晶果糖、甜菊糖、海藻糖、大豆低聚糖、阿拉伯胶、刺槐豆胶、瓜尔豆胶、果胶、黄原胶、结冷胶、聚丙烯酸钠、抗性糊精、可得然胶、魔芋粉、塔拉胶、沙蒿籽胶、明胶、温轮胶、辛烯基琥珀酸淀粉钠、亚麻籽胶、大豆蛋白粉
- 主营：胰酪大豆胨琼脂培养基、标准品、DRE
- 主营：营养强化剂、抗氧化剂、甜味剂、食品级增稠剂、食用色素、酶制剂、粉末香精、酸度调节剂、食品乳化剂、着色剂、抗结剂、增味剂
- 主营：蛋白胨、酪蛋白胨、大豆蛋白胨、琼脂粉、酵母浸粉、胰蛋白胨、酸水解酪蛋白胨、牛肉浸粉、酵母浸膏、牛肉浸膏、胰酪蛋白胨、玉米浆干粉、牛肉蛋白胨、马铃薯浸粉、酵母蛋白胨、鱼蛋白胨、麦芽浸粉、消化血清粉、月示蛋白胨、牛骨蛋白胨、豆粕提取物、胃蛋白胨、多价胨、多聚蛋白胨、黄豆饼粉
- 主营：食品添加剂、饲料添加剂、营养强化剂、磷酸盐保水剂、增稠剂、乳化剂、防腐剂、色素、黄原胶、甘氨酸、酪蛋白酸钠、大豆分离蛋白、海藻酸钠、乳清蛋白粉、L-半胱氨酸、L-苯丙氨酸、L-异亮氨酸、丝氨酸、谷氨酰胺
- 主营：琼脂粉、营养强化剂
- 主营：五氧化二钒、苄基胂酸、水杨酸、食品级琼脂粉、水玻璃、氨基磺酸、多聚甲醛
- 主营：锚固剂、硫酸铝、硫酸铜、琼脂粉现货厂家、切削液、氧化铜、溴化钠、大苏打、导热油、腐植酸、净洗剂、活性炭、水杨酸、硫酸锰、漂白粉、玻璃粉、茶皂素、丁酸钠、磷酸钙、甲酸钠、硬脂酸、消泡剂、酵母硒、磷酸铁、铵明矾、硫酸钡
- 主营：黄丹粉、柠檬酸、导热油、琼脂糖价格、漂白粉、707乳液、氧化铝、氯化钙、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：透析袋、移液器、SIGMA、胰蛋白胨大豆琼脂、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：海藻酸钠、乳酸链球菌素、卡拉胶、琼脂粉、温轮胶、黄原胶、苯丙氨酸、亮氨酸、苏氨酸、谷氨酸、蛋氨酸、牛磺酸、谷氨酰胺、半胱氨酸、酪蛋白酸钠、柑橘黄、羧甲基纤维素钠、聚丙烯酸钠、柠檬酸、氨基丁酸、胍基乙酸、定优胶、L-硒-甲基硒代半胱、干酪素