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- 条状琼脂为类白色或淡黄色半透明细长条状;粉状;琼脂为鳞片状无色或淡黄色粉末。在沸水中极易分散成溶胶,在冷水中不溶,但能吸不膨胀成胶块状,溶胶液呈中性反应。食用时不被酶分解,所以几乎没有营养价值。琼脂易分散于热水,即使0.5%的低浓度也能形成坚实的凝胶。1%的琼脂溶胶在42℃固化,其凝胶即使在94℃也不融化,有很强的弹性。琼脂溶胶的凝固温度较高,一般在35℃即可变成凝胶。琼脂的吸水性和持水性高,干燥琼脂在冷水中浸泡时,徐徐吸水膨润软化,可以吸收20多倍的水。琼脂凝胶的耐热性较强。琼脂的耐酸性比明胶与淀粉强,但不如果胶
质量标准
品级Grade 生物试剂级
(BR级)
水分Moisture<22%
灰分Ash <3%
热水中不溶物Hot water insoluble substance <1%
酸不溶物<0.5%
重金属(Pb)Acid insoluble ash<0.004%
灰分ash ≤1.5%:
品级Grade 灰分ash ≤1.5%
外观Appearance白色至类白色粉末
鉴定方法: 不溶于乙醇,不溶于冷水.
水份: 粉状: 12% max,
pH (1.5%):5.5-7.5
淀粉/糊精:阴性
明胶/其它蛋白质:阴性
凝固点GEL POINT:32-45°C
熔点Melting point 80°C - 95°C
总灰分ASH CONTENT:<1.5%
酸不溶灰份: 小于0.5%
凝胶强度GEL STRENGTH(Kobe法,1.5%):1000克-1200克, 及 700-900克 等级
砷: 3mg/kg max
铅: 5 mg/kg
贮存:旋紧瓶盖,贮存于避光、阴凉干燥处。Keep container tightly closed,stose in a cool,dry place,away from bright light
琼指可用作食品增稠剂、蚕丝上浆剂、缓泻剂,以及药品的胶粘剂、增稠剂和胶囊,还可作为细菌培养基、固定化酶载体、细菌的包理材料和电泳的介质。还可用于病毒,亚细胞粒子和大分子的过滤分离,以及血清抗原或抗体的观察。ADI(每日允许摄入量)不需要特殊规定。
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