| 查看: 181 | 回复: 1 | |||
| 当前主题已经存档。 | |||
[交流]
【共享】【转载】RNA EXTRACTION METHOD FOR COTTON
|
|||
|
RNA EXTRACTION METHOD FOR COTTON Based on: Wan, C.-Y. and Wilkins, T.A. 1994. Anal. Bioch. 223:7-12. Collect young expanding leaves (or other tissue) and freeze in liquid N2 and store at -80°C. Pulverize tissue to a fine powder in a pre-cooled mortar and transfer to a glass homogenizer. Heat RNA Extraction buffer to 80°C and add to frozen ground tissue at a ratio of 5:1 (ml buffer:g tissue) and homogenize for 2 minutes. Transfer homogenate to a 50 ml Oak Ridge tube containing 0.5 mg proteinase K per ml of extraction buffer and incubate with mild agitation on a rotary shaker at 100 rpm for 1.5 hr at 42°C. Add KCl to 160 mM and chill on ice for 1 hour. Centrifuge for 20 min at 12,000g. Filter supernatant through Miracloth and precipitate the RNA overnight in 2M LiCl at 4°C. Centrifuge for 20 min at 12,000g to collect RNA pellet. Wash pellet 2-3 times with 5 ml cold 2 M LiCl until supernatant is relatively colorless. Resuspend RNA pellet in 2 ml 10 mM Tris-HCl (pH 7.5) and clarify by centrifugation for 10 min. Add Potassium Acetate (KAc, pH 5.5) to 200 mM in RNA suspension and incubate for 15 min on ice. Remove salt-insoluble material by centrifugation. Precipitate RNA overnight by adding 2.5 volumes cold 100% ethanol and incubating at -20°C. Pellet RNA, wash with 70% ethanol, dry briefly under vacuum, and suspend pellet in DEPC-treated deionized water of TE buffer. Determine yield by observing absorbance spectra between 220 and 320 nm. Yield should be about 800-1200 µg/g (RNA/fresh tissue). RNA Extraction Buffer: 200 mM sodium borate decahydrate (Borax) pH 9.0 30 mM ethylene glycol bis(ß-aminoethyl ether)-N,N´-tetraacetic acid (EGTA) 10 mM dithiothreitol (DDT) 2% polyvinylpyrrolidone, Mr 4000 (w/v) (PVP) 1% sodium dodecyl sulfate (w/v) (SDS) 1% sodium deoxycholate (w/v) 0.5% Nonidet NP-40 (v/v) (NP-40) [search]RNA EXTRACTION METHOD FOR COTTON[/search] [ Last edited by caucdenis on 2007-5-15 at 08:25 ] |
回复此楼» 猜你喜欢
0703化学
已经有26人回复
-
274求调剂求调剂
已经有11人回复
-
327求调剂
已经有10人回复
-
调剂
已经有19人回复
-
275 求调剂
已经有7人回复
-
求材料调剂，一志愿郑州大学289分
已经有21人回复
-
电子信息346
已经有4人回复
-
求助071001调剂！！！
已经有7人回复
-
一志愿深大085601材料工程专业（专硕）300分可以调剂去哪
已经有12人回复
-
一志愿华东理工085601材料工程303分求调剂
已经有11人回复
2楼2007-05-15 12:43:25
