Multiphasic DNA adsorption to silica surfaces under varying buffer, pH, and ionic strength conditions.
Multiphasic DNA adsorption to silica surfaces under varying buffer, pH, and ionic strength conditions.
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在不同的缓冲液,pH和离子强度条件下,多最多DNA吸附到二氧化硅表面。
DOI:
10.1021/jp3017776
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发表时间:
2012-05-17
影响因子:
3.3
通讯作者:
Niemz, Angelika
中科院分区:
文献类型:
--
作者:
Vandeventer, Peter E.;Lin, Jessica S.;Zwang, Theodore J.;Nadim, Ali;Johal, Malkiat S.;Niemz, Angelika
Reversible interactions between DNA and silica are utilized in the solid phase extraction and purification of DNA from complex samples. Chaotropic salts commonly drive DNA binding to silica, but inhibit DNA polymerase amplification. We studied DNA adsorption to silica using conditions with or without chaotropic salts through bulk depletion and Quartz Crystal Microbalance (QCM) experiments. While more DNA adsorbed to silica using chaotropic salts, certain buffer conditions without chaotropic salts yielded a similar amount of eluted DNA. QCM results indicate that under stronger adsorbing conditions, the adsorbed DNA layer is initially rigid, but becomes viscoelastic within minutes. These results qualitatively agreed with a mathematical model for a multiphasic adsorption process. Buffer conditions that do not require chaotropic salts can simplify protocols for nucleic acid sample preparation. Understanding how DNA adsorbs to silica can help optimize nucleic acid sample preparation for clinical diagnostic and research applications.
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