|
所在平台: Udemy |
课程主页: https://www.udemy.com/course/nucleic-acid-protocols-extraction-and-quantitation/
课程评论：没有评论
**课程名称：** 核酸提取与定量 **课程概述：** 本课程深入探讨了核酸（DNA或RNA）在生物样本中分离、纯化以及定量的关键技术。核酸提取是从生物样本（如血液、唾液或组织）的细胞中分离核酸的过程，旨在去除蛋白质和其他污染物，获得纯净的核酸，以便进行PCR、测序或克隆等下游应用。 课程将介绍多种常用的核酸提取方法，包括： * **细胞裂解：** 机械裂解、化学裂解和酶法裂解。 * **核酸纯化：** 沉淀、纯化（酚-氯仿提取、醇沉淀、硅胶基质纯化等）和浓缩。 * **方法选择：** 根据样本类型和下游应用需求选择合适的提取方法。 * **试剂盒应用：** 介绍不同提取试剂盒的特点，强调选择合适试剂盒的重要性，以节省优化和提取的时间。 **质量控制：** 课程还将重点介绍用于确保提取核酸质量的关键技术，包括： * **分光光度法（Spectrophotometry）：** 通过测量核酸样本在不同波长（特别是260 nm和280 nm）下的吸光度，来评估样本的浓度和纯度。A260/A280的比值是判断核酸纯度的重要指标。 * **凝胶电泳（Gel electrophoresis）：** 用于可视化核酸样本的大小和完整性，进行比较分析。 通过本课程的学习，学员将掌握核酸提取和定量的核心原理和实践操作，为后续的生物学研究打下坚实基础。
Nucleic acid extraction is the process of isolating nucleic acid from the cells of an organism isolated from a sample, typically a biological sample such as blood, saliva, or tissue. It involves breaking open the cells, removing proteins and other contaminants, and purifying the nucleic acid so that it is free of other cellular components. The purified nucleic acid (DNA or RNA) can then be used for downstream applications such as PCR, sequencing, or cloning.This process can be done in several ways, depending on the type of the sample and the downstream application, the most common methods are: mechanical, chemical and enzymatic lysis, precipitation, purification, and concentration.The specific method used to extract the nucleic acid, such as phenol-chloroform extraction, alcohol precipitation, or silica-based purification.For the chemical method, many different kits are used for extraction, and selecting the correct one will save time on kit optimization and extraction procedures.There are several quality control techniques used to ensure the quality of extracted nucleic acid, including:Spectrophotometry: This is a widely used method for measuring the concentration and purity of a nucleic acid sample. Spectrophotometry measures the absorbance of a sample at different wavelengths, typically at 260 nm and 280 nm. The ratio of absorbance at 260 nm and 280 nm is used to determine the purity of the nucleic acid sample.Gel electrophoresis: This technique is used to visualize and compare the size and integrity of nucleic acid samples.
