當前位置:廣州健侖生物科技有限公司>>食品安全檢測>>尼古丁快速檢測試劑盒>> 尼古丁唾液試紙 尼古丁唾液檢測試紙
尼古丁唾液試紙 尼古丁唾液檢測試紙
廣州健侖生物科技?有限公司
本司長期供應尼古丁(可替寧)檢測試劑盒,其主要品牌包括美國NovaBios、廣州健侖、廣州創侖等進口產品,國產產品,試劑盒的實驗方法是膠體金方法。
我司還提供其它進口或國產試劑盒:登革熱、瘧疾、流感、A鏈球菌、合胞病毒、腮病毒、乙腦、寨卡、黃熱病、基孔肯雅熱、克錐蟲病、違禁品濫用、肺炎球菌、軍團菌等試劑盒以及日本生研細菌分型診斷血清、德國SiFin診斷血清、丹麥SSI診斷血清等產品。
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【包裝規格】
1人份/袋,40人份/盒
【預期用途】
尼古丁(Nicotine)是煙草中的主要生物堿,是導致吸煙成癮的物質動因,也是評價人體攝入煙草煙霧的常用指標。但因為尼古丁半衰期短,無法作為標志物檢測,其代謝物可替寧因為半衰期長作為吸煙和戒煙的標志物。
本品采用競爭抑制法和膠體金免疫層析技術,用于快速定性檢測人體唾液中的可替寧,適用于評價煙草煙霧攝入的初步篩查。
【主要組成成份】
【檢驗方法】
尼古丁唾液試紙 尼古丁唾液檢測試紙
一、嵌合抗體
嵌合抗體是利用DNA重組技術,在基因水平上將鼠源單克隆抗體可變區和人抗體恒定區連接起來并在合適的宿主細胞中表達,這種抗體稱為人-鼠嵌合抗體。
構建嵌合抗體的大致過程是,將鼠源單抗的可變區基因克隆出來,連到包含有人抗體恒定區基因及表達所需的其它元件(如啟動子、增強子、選擇標記等)的表達載體上,在哺乳動物細胞(如骨髓瘤細胞、CHO細胞)中表達。
這樣表達的抗體分子中輕重鏈的V區是鼠源的,而C區是人源的,這樣整個抗體分子的近2/3部分都是人源的。這樣產生的抗體,減少了異源性格抗體的免疫原性格,同時保留了親本抗體特異性格結合抗原的能力。
二、改型抗體
改型抗體也稱CDR植入抗體(CDR grafting antibody),抗體可變區的CDR是抗體識別和結合抗原的區域,直接決定抗體的特異性格。將鼠源單抗的CDR移植至人源抗體可變區,替代人源抗體CDR,使人源抗體獲得鼠源單抗的抗原結合特異性格,并可以zui大限度地降低鼠單抗的異源性格。然而,抗原雖然主要和抗體的CDR接觸,但FR區也常參與作用,影響CDR的空間構型。因此換成人源FR區后,這種鼠源CDR和人源FR相嵌的V區,可能改變了單抗原有的CDR構型,結合抗原的能力會下降甚至明顯下降。雖然已能對抗體進行分子設計,在人源FR區引入鼠源FR區的某些關鍵殘基,如配置得當,其親和力可與原有小鼠抗體的親和力相當,但人化抗體常達不到原有鼠源單抗的親和力。三、表面重塑抗體
表面重塑抗體是指對異源抗體表面氨基酸殘基進行人源化改造。該方法的原則是僅替換與人抗體SAR差別明顯的區域,在維持抗體活性格并兼顧減少異源性格基礎上選用與人抗體表面殘基相似的氨基酸替換;另外,所替換的區段不應過多,對于影響側鏈大小、電荷、疏水性格,或可能形成氫鍵從而影響到抗體互補決定區(CDR)構象的殘基盡量不替換。
四、全人源化抗體
全人源化抗體是指將人類抗體基因通過轉基因或轉染色體技術,將人類編碼抗體的基因全部轉移至基因工程改造的抗體基因缺失動物中,使動物表達人類抗體,達到抗體全人源化的目的。
想了解更多的韓國SD產品及服務請掃描下方二維碼:我司還提供其它進口或國產試劑盒:登革熱、瘧疾、流感、A鏈球菌、合胞病毒、腮病毒、乙腦、寨卡、黃熱病、基孔肯雅熱、克錐蟲病、違禁品濫用、肺炎球菌、軍團菌等試劑盒以及日本生研細菌分型診斷血清、德國SiFin診斷血清、丹麥SSI診斷血清等產品。
二維碼掃一掃
【公司名稱】 廣州健侖生物科技有限公司
【】 楊永漢
【】
【騰訊 】
【公司地址】 廣州清華科技園創新基地番禺石樓鎮創啟路63號二期2幢101-3室
【企業文化宣傳】
First, chimeric antibodies
Chimeric antibody is the use of DNA recombinant technology, the murine monoclonal antibody variable region at the genetic level and human antibody constant region connected and expressed in the appropriate host cells, this antibody is called human-mouse chimeric antibody.
The general procedure for constructing the chimeric antibody is to clone the variable region of the murine monoclonal antibody into a gene that contains the human antibody constant region genes and other elements required for expression (e.g., promoters, enhancers, selectable markers, etc.) Expression vector, in mammalian cells (such as myeloma cells, CHO cells).
The light and heavy chain V regions of the antibody molecule so expressed are murine and the C region is human, so that nearly two-thirds of the entire antibody molecule is human-derived. The antibody thus produced reduces the immunogenicity of the heterologous antibody while retaining the ability of the parent antibody to specifically bind to the antigen.
Second, the modified antibody
Also referred to as CDR grafting antibodies, the CDRs of the antibody variable region are the regions where the antibody recognizes and binds the antigen and directly determines the specific lattice of the antibody. CDRs of murine monoclonal antibodies were transplanted into the human antibody variable regions to replace the CDRs of the human antibodies so that the human antibodies could obtain the antigen-binding specific lattice of the murine monoclonal antibody and minimize the heterologous character of the murine monoclonal antibody . However, although the antigen is predominantly in contact with the antibody's CDRs, the FR region is also often involved, affecting the spatial configuration of the CDRs. Therefore, after being replaced by the human FR region, the V region in which the murine CDRs and human FRs are embedded may change the CDR configuration of the single antigen, and the ability of binding to the antigen will be decreased or even decreased significantly. Although molecular design of antibodies has been possible, the introduction of certain key residues in the FR region of human origin into the human FR region, if properly configured, may be as substantive as the affinity of the original mouse antibody. However, To the original mouse monoclonal antibody affinity. Third, the surface remodeling antibody
Surface remodeling antibody refers to the humanized amino acid residues on the surface of heterologous antibody. The principle of this method is to replace only the region that is obviously different from the human antibody SAR, and replace the amino acid substitutions on the surface residues of the human antibody on the basis of maintaining the activity of antibodies and reducing the heterologous character. In addition, the replaced segments should not Too much, residues that do not affect the complementarity-determining region (CDR) conformation of the antibody are not substituted as much as possible for effects on the size, charge, hydrophobicity of the side chains, or the possible formation of hydrogen bonds.
Fourth, fully humanized antibodies
Humanized antibody refers to the human antibody gene by transgene or transchromosome technology, the human encoded all the genes encoding antibody genetically engineered antibody gene deletion in animals, so that the expression of human antibodies to animals, antibodies fully humanized purpose.
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