發(fā)布時間:2023-09-06 20:10:22 人氣:399 來源:析浦(上海)科學儀器
瓊脂糖凝膠電泳是一種凝膠電泳方法,常用于生物化學、分子生物學、遺傳學和臨床化學,用于分離瓊脂糖基質(zhì)中的混合大分子群,例如DNA或蛋白質(zhì)。瓊脂糖凝膠電泳的實驗原理是通過施加電場使帶電分子穿過瓊脂糖基質(zhì)來分離生物分子,并根據(jù)瓊脂糖凝膠基質(zhì)中的大小來分離生物分子。
與其他基質(zhì)相比,瓊脂糖凝膠易于澆鑄和處理,并且核酸在電泳過程中不會發(fā)生化學改變。樣品也很容易回收。實驗結(jié)束后,所得凝膠可以裝在塑料袋中放入冰箱保存。瓊脂糖凝膠易于澆鑄,具有相對較少的帶電基團,特別適合分離實驗室中最常見的尺寸范圍的DNA,這也是其使用廣泛的原因。分離的DNA可以用染色劑觀察,最常見的是使用紫外透射儀進行紫外光照射,并且可以相對容易地從凝膠中提取DNA片段。大多數(shù)使用的瓊脂糖凝膠都溶解在合適的電泳緩沖液中,濃度為0.7-2%。
估計限制性酶消化后DNA分子的大小,例如在克隆DNA的限制性圖譜中。
通過比較核酸條帶的強度與大小標記的相應條帶來估計DNA濃度。
聚合酶鏈式反應 (PCR) 產(chǎn)物的分析,例如在分子遺傳診斷或基因指紋分析中。
分離DNA片段以進行提取和純化。
在Southern 轉(zhuǎn)移之前分離限制性基因組DNA,或在Northern轉(zhuǎn)移之前分離RNA。
蛋白質(zhì)的分離,例如臨床化學中蛋白質(zhì)異常的篩查。
在凝膠電泳實驗后,紫外透射儀可以用于蛋白質(zhì)和DNA聚丙烯酰胺和瓊脂糖凝膠的觀察分析和切膠。析浦雙波長紫外透射儀XEPU-1126ML同時提供中波302nm和長波365nm兩種波長,中波302nm紫外線適合DNA/RNA的觀察和分析,長波365nm紫外線適合切割條帶。析浦雙波長紫外透射儀可以同時滿足凝膠觀察和切膠的需求,一機兩用,是您凝膠電泳實驗的好助手!
析浦紫外透射儀操作十分簡單!具體步驟如下:將凝膠放置在析浦紫外透射儀XEPU-1126上,選擇您需要的波段,并調(diào)節(jié)紫外光強度進行照射。經(jīng)過紫外線照射,可輕松觀察到DNA/RNA分子條帶的位置。接下來,您就可以拍照或切膠啦!
下圖:析浦雙波長302nm+365nm紫外透射儀XEPU-1126ML
雙波長紫外透射儀的產(chǎn)品介紹,請瀏覽:XEPU-1126ML析浦雙波長紫外透射臺
Agarose gel electrophoresis is a common laboratory technique used to separate and analyze DNA fragments and other biomolecules based on their size. It is widely employed in molecular biology, genetics, and biochemistry research.
The process involves the use of a gel made from agarose, a polysaccharide derived from seaweed. Agarose forms a porous matrix when mixed with a buffer solution and allowed to solidify. This gel matrix creates a molecular sieve through which the biomolecules can migrate under the influence of an electric field.
Estimation of the size of DNA molecules following digestion with restriction enzymes, e.g., in restriction mapping of cloned DNA.
Estimation of the DNA concentration by comparing the intensity of the nucleic acid band with the corresponding band of the size marker.
Analysis of products of a polymerase chain reaction (PCR), e.g., in molecular genetic diagnosis or genetic fingerprinting
Separation of DNA fragments for extraction and purification.
Separation of restricted genomic DNA prior to Southern transfer, or of RNA prior to Northern transfer.
Separation of proteins, for example, screening of protein abnormalities in clinical chemistry.