CTXI is type I collagen cross-linking carboxyterminal telopeptide, type I collagen consists of three peptide chains, two of them are α(I) chains, the rest is α(Ⅱ) chain, three uncoiling short peptides exist in the carboxyl terminal of mature type I collagen. CTXI is a telopeptide which is disaggregated from the terminal of type I collagen. Due to the collagen with unique triplex super helical structure, its property is very stable, it cannot be resolved by the general processing temperature and short time heating, it is hard to be digestive absorption and not easy for the body to make full use of.Type I collagen mainly distributes in the skin, bone, cornea, muscle tendon and tumour......2016-09-13

To be prepared the antibodies against small molecules, the structure of small molecules is important, and it is commonly to have a certain complexity and rigidity, including benzene rings, heterocyclic groups or branched structures, otherwise, it would be difficult to produce antibodies with good titers.Some haptens have a reactive group, such as -COOH, -NH2, -OH, etc., and these haptens could be directly conjugated to a carrier protein, and then to be a totally artificial antigen, please see the the principle of coupling in Fig1.. However, the haptens should be re-designed and modified if there are no reactive groups which could be covalently conjugated to a carrier, or though the hap......2016-09-13

The traditional E. coli expression system has been continuously improved and optimized. It has the advantages of short production cycle, high efficiency, low cost and so on. But it also has the defects of the system itself. E. coli expression system can not complete the folding and modification of eukaryotic proteins. So far, this system still can not be used for expressing the membrane protein and some toxic protein expression, which seriously restricts the application of E.coli Expression System. In order to make up for the defects of the prokaryotic expression system, the eukaryotic expression system is commonly used to express the recombinant protein.But the eukaryotic expression s......2016-09-13

Precision means the testing consistency of measured values obtained by repeated test with same sample under same condition. As one of the basic analytical performance of the detection system, it is the basis of validity assessment for detection system. Well, how to measure the precision of ELISA kit?The precision of ELISA kit is divided into ‘Intra-assay Precision’ and ‘Inter-assay Precision’. It is shown in coefficient of variation(CV).Intra-assay Precision (Precision within an assay): 3 samples with low, middle and high level analytes were tested 20 times on one plate, respectively. Then the Mean and standard deviation(SD) were calculated by following formulas.Inter-assay Pre......2016-08-03

Tumor is a neoplasm which forms on the local tissue, due to the stimulation of various tumorigenic factors. It can be divided into benign and malignant tumor according to the biological characteristics of tumor cell and the damage degree to the body. Malignant tumor is also know as cancer, which is one of the main causes of death in the world nowadays. It has caused a serious hazard to human-beings, and restrict the social and economic development. Because of this, study of cancers has always been a hot spot in the field of biomedical research.Tumor markers refer to substances produced in malignant cells or host cells which is generated by the stimulation of malignant cells. It can ref......2016-08-03

Uromodulin is a glycoprotein encoded by the UMOD gene, which is the most abundant protein in urine of normal mammals. It’s mainly from the Heinz loop of the mammalian kidney.The molecular weight of monomer UMOD is about 85kDa. UMOD has several different isoforms and exists in aggregates, so the MW could reach millions Da. When the pH is low, precipitations may form.By the analysis of UMOD sequence, Glu28~Glu149 were chosen for gene cloning and protein expression to get recombinant protein, the cat no. is RPG918Hu01. Immunizing mouse and rabbit with the protein, we got the monoclonal antibody MAG918Hu21, polyclonal antibody PAG918Hu01, biotin labled polyclonal antibody PAG918Hu71. The......2016-06-12