elisa試劑盒的抉擇

什麽(me) 是elisa試劑盒？要購買(mai) 什麽(me) 樣的elisa試劑盒？這個(ge) 試劑盒能夠符合實驗的要求麽(me) ？檢測下來的準確度怎麽(me) 樣？檢測的數據用來發文章會(hui) 得到認可麽(me) ？這是很多老師在購買(mai) elisa試劑盒前往往會(hui) 考慮的問題。

想買(mai) 一個(ge) 檢測準確，又得到認可的試劑盒，不難，請認準信帆生物的elisa試劑盒。多年的研發經驗，多所高校的驗證，上百篇文獻的引用，不乏發表在SCI上文獻的使用。我們(men) 隻提供質量可靠的elisa試劑盒，操作簡單，檢測靈敏度高，有質量問題包退換。

elisa試劑盒的抉擇  請認準信帆生物

What is ELISA? Enzyme-linked immunosorbent assay (ELISA)

Enzyme-linked immunosorbent assay (ELISA), also known as an enzyme immunoassay (EIA), is a biochemical technique used mainly in immunology to detect the presence of an antibody or an antigen in a sample. The ELISA has been used as a diagnostic tool in medicine and plant pathology, as well as a quality-control check in various industries,such as ELISA application in food industry. In simple terms, in ELISA, an unknown amount of antigen is affixed to a surface, and then a specific antibody is applied over the surface so that it can bind to the antigen. This antibody is linked to an enzyme, and in the final step a substance is added that the enzyme can convert to some detectable signal, most commonly a colour change in a chemical substrate.

酶聯免疫吸附試驗（ELISA），也稱為(wei) 酶免疫測定法（EIA），是一種生化技術，主要用於(yu) 免疫學檢測樣品中的抗體(ti) 或抗原的存在。酶聯免疫吸附試驗已作為(wei) 醫學和植物病理學的診斷工具，並已在食品工業(ye) 中應用，如酶聯免疫吸附試驗等。簡單地說，在ELISA中，一個(ge) 未知量的抗原附著在一個(ge) 表麵上，然後一個(ge) 特定的抗體(ti) 被施加在表麵上，以便它可以綁定到抗原。這種抗體(ti) 與(yu) 酶相連，在zui後一步添加一種物質，這種酶可以轉化為(wei) 一些可檢測到的信號，通常是化學底物的顏色變化。

elisa試劑盒的抉擇  請認準信帆生物

If a protein with multiple epitopes is being detected, a sandwich assay is a good choice. It usually requires two antibodies that react with different epitopes. However, if the molecule has multiple repeating epitopes, it is possible in a sandwich assay to use the same antibody for both capture and detection. Alternatively, if there is a supply of the analyte to be detected in pure form that can absorb effectively to a microwell, then one can set up a competitive assay in which the purified analyte is immobilized and analyte in the sample competes with the immobilized analyte for binding to labeled antibody. In this case it is essential to titrate the antibody so that it is limiting, or else the assay sensitivity will be lowered.

elisa試劑盒的抉擇  請認準信帆生物

Polystyrene will bind a wide variety of proteins in an increasing amount depending on their concentration in the coating solution. The specific and optimal amount needs to be determined for each protein, but some general observations have been made for antibodies. Medium to low binding plates bind typically up to 100 - 200 ng of IgG/cm² while high binding plates typically can bind up to 400 - 500 ng of IgG/cm². In addition to proteins, polystyrene plates will absorb peptides generally of 15 - 20 amino acids in length. In order to achieve strong binding, a peptide will need both hydrophobic and hydrophilic interactions. Typically a drawback to adsorbing peptides directly is that they tend to have few epitopes, and if these are involved in interaction with the plastic, it will be difficult for an antibody to bind to them. One alternative is to attach the peptide to a larger protein through a spacer arm that provides some distance between the peptide and the protein, allowing the antibody to interact with the peptide.

An organism such as bacterial or viral assays that detect whole organisms can also use sandwich assays with the same antibody for both capture and detection. If the target molecule is small or consists of a single epitope, a modification of the formats described above is needed. Small molecules by themselves either do not adsorb well to a solid phase, or may be masked by the blocking protein added. However, small molecules can often be attached to larger proteins which provide a means to attach the desired epitope to a solid phase in a configuration that allows the epitope to be bound by an antibody.

Carbohydrates and heavily glycosylated proteins do not adsorb well to polystyrene by the forces described above because they have very little ability to participate in hydrophobic interactions. Membrane proteins released from cells and maintained in solution by detergents are also not adsorbed well in the presence of detergents. Covalent linkage or reduction of the detergent concentration are the best means for attaching these proteins. In fact, covalent linkage can be performed in the presence of detergents such as Tween-20 and Triton X-100.