产品详情
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产品名称
SS-18 多肽
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序列
SGELEQEEERLSKEWEDS
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三字母序列
H-Ser-Gly-Glu-Leu-Glu-Gln-Glu-Glu-Glu-Arg-Leu-Ser-Lys-Glu-Trp-Glu-Asp-Ser-OH
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长度 (aa)
18
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多肽纯度 (HPLC, %)
95.34
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分子式
C90H138N24O39
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分子量(Da)
2180.19
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来源
固相合成
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描述
SS-18 is a peptide derived from human chromogranin A (CgA). It consists of amino acid residues 304 - 321 of CgA. The detected mass (M + H)+ of SS-18 is 2180.85 Da, with a calculated mass of 2180.22 Da. The processing sites involved in its generation are between K at position 304 and KR at position 321, and putative enzymes responsible for its formation include prohormone convertase 1/3, prohormone convertase 2, and carboxypeptidase H.
SS-18 was identified through a series of chromatographic fractionation and mass spectrometric analysis. The extract of human insulinoma was first subjected to gel permeation chromatography and then RP-HPLC. In the RP-HPLC analysis of pool 3, SS-18 was detected by MALDI-TOF mass spectrometry. It was found that SS-18 is difficult to resolve from peptide WE-14 by RP-HPLC and is consistently present in preparations of the latter peptide.
This peptide is not only identified in human insulinoma but also in the extract of a mid-gut carcinoid tumour, indicating its presence in multiple neuroendocrine tumour types. The identification of SS-18 provides valuable information for understanding the endogenous processing of CgA and may have implications for further studies on the biological functions of CgA-derived peptides. -
储存指南
一般情况下, SS-18 多肽 粉末应该保存在-20甚至-70摄氏度. SS-18 多肽 溶解后应该-70摄氏度分装保存,避免反复冻融. 了解更多细节,请查阅手册:多肽溶解及保存指南
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关于三氟乙酸盐
三氟乙酸(TFA)是一种强酸,常用于从固相树脂中裂解合成的多肽,也可用于提高多肽纯化步骤中的HPLC性能。默认情况下,定制的多肽是以冻干的TFA盐的形式交付的,其中TFA的含量可能高达10-45%。
定制多肽中的TFA可能会导致后续检测数据出现无法解释的差异。例如,nM浓度的TFA已被证明会干扰细胞实验,在某些情况下会抑制细胞增殖,而在其他情况下会增加细胞活力。
TFA去除服务推荐用于:
- 将用于细胞试验的多肽
- 将被用作原料药或制成品的多肽
- 含有大量碱性残基的亲水多肽
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关于多肽净含量
干品多肽的重量中不仅仅包含多肽,还包含有一些非肽的组份,如水、被吸收的溶剂、配位离子和盐等。肽的净含量是指肽在其中的重量百分比,这个百分比的数值范围很大,可能从50%到90%,取决于纯度、序列以及合成和纯化的方法,不要将肽的净含量和肽的纯度混为一谈,他们是两个完全不同的概念。纯度通常是通过HPLC测定的。纯度定义的是多肽样品中含正确序列的组分的百分比,而肽的净含量是指样品中肽类物质相对于总物质所占的百分比,肽的净含量通常是氨基酸组分分析或紫外分光法测定的,这个信息主要是在一些对肽的浓度很敏感的实验中,对计算肽的浓度是很重要的。
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摩尔浓度计算器
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稀释计算器
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百分比浓度计算器
质量 (g) = 浓度 (mol/L) × 体积 (L) × 分子量 (g/mol)
相关服务
多肽合成服务: 纽普生物(NovoPro)提供常规多肽合成、糖修饰多肽合成、稳定同位素标记的多肽合成、磷酸化多肽合成、荧光标记多肽、多肽的BSA/KLH/OVA等载体蛋白的偶联等服务。