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- 详细信息
- 文献和实验
- 技术资料
- 库存:
38
- 英文名:
Polymyxin B (sulfate)
- CAS号:
1405-20-5
- 供应商:
上海莼试
- 保存条件:
Store at 2-8°C
- 规格:
1g 5g
1.本蛋白酶抑制剂混合物为100×的储存液,使用时按照1:100的比例加入到裂解液中(例如,1ml裂解液中加入10μl蛋白酶抑制剂混合物),混匀后即可使用。根据需要,0.5M的EDTA也按照1:100的比例加入到裂解液中(如用于检测金属蛋白酶活性,则不宜添加EDTA)。含有蛋白酶抑制剂混合物的裂解液宜现用现配,不宜配制后冻存待后续使用。
2. 待所需的抑制剂添加完毕混匀后,就可以开始进行哺乳动物组织的裂解和蛋白提取。
商品属性:
| 货号 | CS-01Y72743 | 规格 | 1g 5g |
| CAS号 | 1405-20-5 | 分子量 | 1301.6 |
| 含量 | >98.00% | 别名 | Aerosporin,Mastimyxin |
| 分子式 | 化学名 | N-(4-amino-1-((1-((4-amino-1-oxo-1-((6,9,18-tris(2-aminoethyl)-15-benzyl-3-(1-hydroxyethyl)-12-isobutyl-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptaazacyclotricosan-21-yl)amino)butan-2-yl)amino)-3-hydroxy-1-oxobutan-2-yl)amino)-1-oxobutan-2 | |
| 产地 | 国产 | 用途 | 仅供科研研究实验 |
分子式:

分子量:1301.6
溶解度:H2O : ≥ 25 mg/mL
储存条件:Store at 2-8°C
General tips:For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.
Shipping Condition:Evaluation sample solution : ship with blue ice All other available size: ship with RT , or blue ice upon request
Polymyxin B, a mixture of polymyxins B1 and B2, is obtained from Bacillus polymyxa strains. Polymyxin B exhibits bactericidal activity against major multidrug-resistant gram-negative bacteria, most fungi and gram-positive bacteria. As basic polypeptides of about eight amino acids, polymyxins B1 and B2 have cationic detergent action on cell membranes. Moreover, polymyxin B is used for infections with gram-negative organisms, which may be nephrotoxic and neurotoxic. Polymyxin B is appropriate to treat the infections of the meninges, urinary tract, and blood stream, triggered by susceptible Pseudomonas aeruginosa strains.In vitro: Polymyxin B elicited up-regulation of dendritic cells (DCs) maturation markers, including the increase in the in the expression of co-stimulatory molecule CD86 and HLA-class I and II molecules. Polymyxin B induced a progressive increase in the adhesion property of human DCs. In addition, polymyxin B triggered the activation of the ERK1/2 pathway and IκB-α/NF-κB pathways [1].In vivo: Male bacteraemia ddY mice were subcutaneously treated with polymyxin B at a dose of 5, 10, 15 or 20 mg/kg for 7 days. Polymyxin B, in a dose-dependent fashion, improved the survival both of OU-01062- and OU-98039-infected mice. In polymyxin B-treated mice, except for 5 mg/kg polymyxin B, the viable cell counts had a tendency to reduce steadily in each concentration group. It was showed a rapid and marked decline of bacterial cell count between 3 to 6 h after infection [2].
注意事项:
抗逆滴加序列
每次向板内滴加抗原时,移液器滴头要与平面45度悬空,不要触碰到孔内的液体,由后向前依次滴加(即浓度由低往高滴加)。
抗感染反应期
抗原抗体在室温20~25℃下,必须反应30min以上,若环境温度低于室温,可将微量反应板置于恒温培养箱中,使二者充分反应。
旅游温度
磷酸盐缓冲液的pH值要在高压灭菌后进行滴定,往往在高压后pH值会有所改变,所以高压后再调一次pH值更为准确。磷酸盐缓冲液一经使用保存期不要超过3周。当pH<5.8时,红细胞会产生自凝现象;当pH>7.8时,图形洗脱加快,易造成肉眼观察产生误差;p H=7.2时,红细胞沉降最充分,图形最清晰。
当滴注 1%红细胞悬液时,应经常摇晃红细胞悬液,使红细胞均匀地分布在磷酸缓冲液中,以防止红细胞下降。
反应时间及温度
加入鸡红血球之后,反应板在室温(20~25℃)静置30~40min,对照孔血球下沉于孔底,即可判定结果。若室温达不到实验要求,需相应调整反应时间。当环境温度低于4℃时,红细胞发生自凝;高于37℃时,会发生反应物分离和红细胞溶血。
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文献和实验发现于多粘杆菌(Bacillus polymyxa)培养液中的抗菌性多肽,有A、B、C、D、E等五种。抗菌谱相互类似而范围宽广,特别对革兰氏阴性细菌作用颇强,毒性较弱。口服时不能吸收,但皮下或肌肉注射很快就转移到血液中去,在3-16小时保持较高的血中浓度。多粘菌素A用于治疗幼儿的重症百日咳可获很好效果。能使金黄色葡萄球菌及大肠杆菌的R型菌体凝集,并形成核糖核酸和不溶性盐类。多粘菌素B对肾的损害较A、 D两类为少,因此作为点眼药应市,对细菌性眼炎有效。
Metabolic Labeling with Sulfate
. Huttner, W.B. 1984. Determination and occurrence of tyrosine O‐sulfate in proteins. Methods Enzymol. 107:200‐223. Huttner, W.B
Look Ma, No Archenteron! Sulfate role in sea urchin early development
in a control embryo (Figure 2A). However, AP activity was only apparent at the vegetal plate in a sulfate-free embryo (Figure 2B). A. B. Figure 2. Fixed two-day old sea urchin embryos stained for alkaline phosphotase enzyme activity. (A) White
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