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PCR基本实验方法(一)

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1031

 

Recommended Reagent Concentrations:

  • Primers: 0.2 - 1.0 uM
  • Nucleotides: 50 - 200 uM EACH dNTP
  • Dimethyl sulphoxide (DMSO): 0 - 10% (v/v)
  • Taq polymerase: 0.5 - 1.0 Units/50ul rxn

Target DNA: 1 ng - 1 ug (NB: higher concn for total genomic DNA; lower for plasmid / purified DNA / virus DNA target)

Buffer : use proprietary or home-made 10x rxn mix; eg: Cetus, Promega. This should contain: minimum of 1.5mM Mg2+, usually some detergent, perhaps some gelatin or BSA. Promega now supply 25mM MgCl2, to allow user-specified [Mg2+] for reaction optimisation with different combinations of primers and targets.

MAKE POOLED MASTER MIX OF REAGENTS IN ABSENCE OF DNA using DNA-free pipette, then dispense to individual tubes (using DNA-free pipette), and add DNA to individual reactions USING PLUGGED TIPS.

OVERLAY REACTIONS WITH 50UL OF HIGH-QUALITY LIQUID PARAFFIN OR MINERAL OIL to ensure no evaporation occurs: this changes reactant concentrations. NOTE : latest wisdom has it one can use VASELINE - this also allows "HOT START" PCR.

 


NOTE:


USE PLUGGED PIPETTE TIPS: prevents aerosol contamination of pipettes.

Use of detergents is recommended only for Taq from Promega (up to 0.1% v/v, Triton X-100 or Tween-20). DMSO apparently allows better denaturation of longer target sequences (>1kb) and more product.

DO NOT USE SAME PIPETTE FOR DISPENSING NUCLEIC ACIDS AS YOU USE FOR DISPENSING REAGENTS

Remember sample volume should not exceed 1/10th reaction volume, and sample DNA/NTP/primer concentrations should not be too high as otherwise all available Mg2+ is chelated out of solution and enzyme reactivity is adversely affected. Any increase in dNTPs over 200uM means [Mg2+] should be re-optimised.

AVOID USING EDTA-CONTAINING BUFFERS AS EDTA CHELATES Mg2+

Low primer, target, Taq, and nucleotide concentrations are to be favoured as these generally ensure cleaner product and lower background, perhaps at the cost of detection sensitivity.

PCR方法相关产品:

  • 电泳设备

  • 紫外设备
  • 普通PCR仪
  • 定量PCR仪
  • PCR/RT-PCR/qPCR试剂
  • PCR引物
  • PCR试剂
  • PCR对照
  • 特异性PCR试剂盒
  • PCR克隆试剂盒
  • RNA
  • RNase检测/去除
  • RT-PCR试剂
  • RT-PCR标准品
  • 定量PCR试剂
  • 定量PCR标记
  • 总RNA分离纯化盒
  • PCR产物纯化
  • 核酸酶
  • 聚合酶
  • 反转录酶

 

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