LBIS® 小鼠 C-肽 ELISA 试剂盒(U型)
LBIS® C-Peptide-Mouse (U type)
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LBIS® C-Peptide-Mouse (U type)
LBIS® 小鼠 C-肽 ELISA 试剂盒(U 型)
胰岛素是细胞中的单链胰岛素原合成后,形成二硫键,通过酶分解激活,裂解成C肽与胰岛素。小鼠、大鼠的胰岛素的氨基酸序列相同,但C肽部分稍有不同。小鼠C肽1是 29 个氨基酸,2是 31 个的单链肽。C肽是从胰岛素原分离后,与胰岛素一同分泌生成的。长期以来,人们一直认为C肽没有生物活性,仅在合成胰岛素过程中,保证A链和B链正确折叠以及二硫键正确配对时起作用。近年,随着研究的不断深入,证明了C肽具有多种生物学作用。首先,10-9M 的C肽能与内皮细胞、肾小管上皮细胞和成纤维细胞表面的G蛋白偶联受体结合。激活细胞中钙离子依赖性的信号、激活 Na+-K+-ATPase、促进内皮细胞的 NO 合成、与受体的结合有立体结构特异性;与胰岛素、胰岛素原、IGF-I、-II、NPY 之间无交叉反应。而且通过对缺少C肽的Ⅰ型糖尿病患者注射C肽类药物,能起到增强骨骼肌以及皮肤的血液循环、降低肾小球超滤的风险、抑制白蛋白从尿液中的排泄、改善神经机能的作用。但对身体健康的人来说,这类药物没有此等功效。因此,建议Ⅰ型糖尿病患者可以在注射胰岛素的同时,投放C肽,有利于防止并发症的发生。
C肽的C末端的五肽(27-31)在与受体的结合中起着重要的作用,缺少这部分的 Des(27-31)C肽就会失去它的作用。这种五肽可以完全取代C肽和受体的结合,激活 Na+-K+ATPase。有报告指出新生大鼠中 Des(27-31)C肽的存在量约占C肽总量的37%,而在成年大鼠中只占8.5%。
C肽在血液中的寿命是胰岛素的好几倍。在临床上,可以通过测量C肽在血液中的浓度来观察胰岛素的合成和分泌功能。且C肽在尿液中多量排除,一定程度上与血液中C肽的平均值相关,所以也可以通过尿液来检测。
作为人工胰岛中胰岛素分泌的指标,C肽测量是有效的。由于在培养液中经常添加胰岛素,如果要测量培养后培养液中的胰岛素的话,就不能很好地区别出分泌的胰岛素和添加的胰岛素,必须减掉培养开始时胰岛素的量。这种情况下,如果分泌的胰岛素量过少,测量误差的影响会增大,从而不能做出正确的判断。这时候,如果测量C肽,因为C肽与胰岛素是等摩尔分泌的,所以能够正确判断分泌的胰岛素。
本公司的整套产品能够识别C肽1、2的交叉部分,可以测量C肽的总量。
◆特点
● 短时间测定(完全反应时间:5小时)
● (标准用量 10 μL)可测
● 使用对环境无害的防腐剂
● 全部试剂均为液体,可直接使用
● 精密的测定密度和高再现性
◆构成
组成 |
状态 |
容量 |
(A) 抗体固相化 96 孔板 |
洗净后使用 |
96 wells(8×12)/1 块 |
(B) 标准溶液(6,000 pg/mL) |
稀释后使用 |
500 μL/1 瓶 |
(C) 缓冲液 |
即用 |
60 mL/1 瓶 |
(D) 抗C-肽抗体生物素结合 |
稀释后使用 |
100 μL/1 瓶 |
(E) 过氧化物・抗生物素蛋白结合物 |
稀释后使用 |
100 μL/1 瓶 |
(F) 显色液(TMB) |
即用 |
12 mL/1 瓶 |
(H) 反应停止液(1M H2SO4)※小心轻放 |
即用 |
12 mL/1 瓶 |
( I ) 浓缩洗净液(10×) |
稀释后使用 |
100 mL/1 瓶 |
封板膜 |
4 张 |
|
使用说明书 |
1 份 |
◆样本
小鼠的血清或血浆
10 μL/well(用本品配备的缓冲液稀释后、50 μL 分注在孔板中。)
◆测定范围
46.9~3,000 pg/mL(标准曲线范围)
234.5~15,000 pg/mL(检体量 10 μL 的时候)
◆Validation data
精度测试(组内变异)
样本 |
A |
B |
1 |
976 |
238 |
2 |
969 |
230 |
3 |
965 |
230 |
4 |
1023 |
235 |
5 |
977 |
231 |
6 |
1018 |
228 |
7 |
1038 |
229 |
8 |
995 |
225 |
mean |
995 |
231 |
SD |
27.7 |
4.10 |
CV(%) |
2.78 |
1.78 |
单位:pg/mL
重复性测试(组间变异)
测量日/检体 |
C |
D |
E |
第0天 |
1502 |
301 |
60.9 |
第1天 |
1500 |
302 |
63.8 |
第2天 |
1499 |
301 |
62.2 |
第3天 |
1501 |
300 |
58.8 |
mean |
1500 |
301 |
61.4 |
SD |
1.12 |
0.66 |
2.13 |
CV(%) |
0.07 |
0.22 |
3.46 |
单位:pg/mL, n=4
加标回收测试
样本F
添加量 |
实测值 |
回收量 |
回收率(%) |
0.00 |
300 |
– |
– |
265 |
551 |
250 |
94 |
398 |
683 |
382 |
96 |
531 |
827 |
527 |
99 |
单位:pg/mL, n=2
样本G
添加量 |
实测值 |
回收量 |
回收率(%) |
0.00 |
58.2 |
– |
– |
28.9 |
86.7 |
28.5 |
99 |
38.6 |
98.2 |
40.0 |
104 |
77.4 |
139 |
80.8 |
104 |
单位:pg/mL, n=2
稀释直线性测试
用稀释缓冲液分三次连续稀释2个血清检体的结果,直线回归方程的 R2 是 1.00 。
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相关资料
说明书 |
ELISA试剂盒选择指南①② |
ELISA试剂盒选择指③④ |
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Evaluation of 7-O-galloyl-d-sedoheptulose, isolated from Corni Fructus, in the adipose tissue of type 2 diabetic db/db mice. Park CH., Tanaka T., Yokozawa T. Fitoterapia, Vol.89, p131-142, Sep 2013. |
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产品编号 | 产品名称 | 产品规格 | 产品等级 | 备注 |
635-07239 | (AKRCP-031)LBIS® Mouse C-peptide ELISA kit (U-type) LBIS®小鼠 C-肽 ELISA试剂盒(U型) |
96 tests | – | – |