北京格瑞德曼仪器设备有限公司
已认?/p>
一?/span>实验试剂9/span>
1.CTAB抽提液:
2%'/span>w/v(/span>CTAB
100 mmol/L Tris-HCl(pH8.0)
20 mmol/L EDTA(pH8.0)
1.4 mol/L NaCl
抽提含多酚较多的植物材料时(比如木本植物),上述抽提液中可另加入2%皃/span>PVP(聚乙烯吡咯烷酮)、/span>
抽提液于室温保存,可在几年内保持稳定。临用之前向装有上述抽提液的试管中加入约2%-3%'/span>v/v)的β-巯基乙醇、/span>
2、醋酸钠9/span>
3 mol/L NaAc
用冰乙酸谂/span>pH值至4.8-5.2、/span>
3?/span>TE溶液9/span>
4、其它:
无水乙醇,异丙醇+/span>75%乙醇,酚:氯仿:异戊醇'/span>259/span>249/span>1),氯仿:异戊醇'/span>249/span>1),β-巯基乙醇,重蒸水、/span>
二?/span>实验步骤
1.样品研磨
1)叕/span>1g的样品放?/span>2ml ep管中
2)加入1-2粑/span>5mm研磨珟/span>
3)加入1ml皃/span>CTAB抽提涱/span>
4)将加有样品的ep管放入高通量组织研磨仪的适配器中,盖奼/span>
5)将研磨转速调?/span>1800,设定研磨时间为90秒(可根椐样品的研磨的难易程度来调节,此数据是以银杏落叶为样本得出)
6)启动研磨仪对样品进行研磨(根据不同的样品,本身性质不同,需要对研磨频率和研磨时间进行适当的调整)
2. DNA的粗描/span>
1)将研磨好的样品取出于65ℂ/span>水浴45min,中途间隔(轻柔)振荡三次混匀
2)冷却后加入等体积氯仿:异戊醇'/span>249/span>1),轻柔颠倒混匀使乳匕/span>10min
3) 7000g-8000g离心10min'/span>18-20ℂ/span>(/span>
4)吸取上清于另一干净的离心管?/span>
5)(根据需要可用氯仿:异戊醇如上法重复抽提一次,吸取上清(/span>
6)加入与上清液等体积(且已亍/span>-20ℂ/span>预冷的异丙醇,颠倒混匀,约1臲/span>2分钟后应有白色絮状沉淀出现(若没有,则加入上清涱/span>1/5臲/span>1/10体积皃/span>pH4.8-5.2皃/span>3M NaAc,混匀,于,/span>20ℂ/span>冰箱中沉淀30min(/span>
7)离心法沉淀DNA
8)?/span>75%乙醇中漂洖/span>DNA数分钟以上,?/span>Tip头吸干乙醆/span>
9)?/span>1ml 75%乙醇再漂洗一欠/span>
10)沉淀于室温或64ℂ/span>以下的恒温箱中干燥片刻至刚出现半透明,不要过度干?/span>
11)?/span>50μlTE溶解沉淀,可?/span>65ℂ/span>水浴助溶+/span>DNA粗提物可用于粗略PCR等、/span>
3. DNA的纯匕/span>
1)吐/span>TE溶解皃/span>DNA粗提物中?/span>4-10μl RNaseA(?/span>40-100μg)
2)亍/span>37ℂ/span>酶解RNA 1hr戕/span>65ℂ/span>酶解RNA 30min以上
3)加入50μl酚:氯仿:异戊醇'/span>259/span>249/span>1),轻轻颠倒混匀10min
4) 10000g以上常温离心10min,吸取上渄/span>
5)加入50μl仿氯:异戊醇'/span>249/span>1)轻轻颠們/span>10min
6) 10000g以上常温离心10min,吸取上渄/span>(根据需要可重复用氯仿:异戊醇如上法再抽描/span>1-2次,以充分去除蛋白和酙/span>)
7)向上清中加入1/5-1/10体积皃/span>pH4.8-5.2皃/span>3M NaAc,并加?/span>2.5倍体积无水乙醇,于-20ℂ/span>沉淀30min以上
8) 12000g?/span>4ℂ/span>低温离心10min,吸干液体
9)沉淀?/span>75%乙醇漂洗二欠/span>
10)沉淀于室温或64ℂ/span>以下恒温箱中干燥片刻至刚开始出现半透明状,勿过度干燥加?/span>50μl重蒸水溶觢/span>DNA,可亍/span>65ℂ/span>水浴助溶
11)叕/span>5μl DNA电泳检?/span>DNA的质野/span>
12) 100-500倍稀释后于分光光度计上测宙/span>OD260叉/span>OD280,分枏/span>DNA的浓度和质量
13)保存DNA亍/span>-20ℂ/span>
补充:如果需要提取的样品比较多(比如1g),研磨好的样品在后续的提取中,需要转移到大的epp管中,研磨时可以加入较少的抽提液,研磨完毕按?/span>1g样品10ml提取液补充抽提液,进行后续的操作、/span>
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