Overview
Standard PCR (Polymerase Chain Reaction) is the foundational technique for amplifying specific DNA sequences in vitro. Developed in 1983 by Kary Mullis, it revolutionized molecular biology by enabling exponential DNA replication through thermal cycling. The process involves three main steps: denaturation (95°C), annealing (50-65°C), and extension (72°C), repeated for 20-40 cycles. This method forms the basis for all PCR variants and remains essential in research labs, clinical diagnostics, and forensic analysis. Unlike qPCR, standard PCR requires post-amplification gel electrophoresis for result visualization, making it more time-consuming but cost-effective for basic applications.
Physical and Chemical Properties
Standard PCR reagents consist of a thermostable DNA polymerase (typically Taq), dNTPs (deoxynucleotide triphosphates), primers, reaction buffer with MgCl₂, and nuclease-free water. The buffer maintains optimal pH (8.3-9.0) and provides ionic conditions for enzyme activity. Mg²⁺ acts as a cofactor for polymerase, with concentrations critically affecting reaction specificity. Key thermal properties include the denaturation temperature (90-95°C) that separates DNA strands, and the polymerase's optimal activity range (70-80°C). Most PCR components are stable at -20°C long-term but degrade with repeated freeze-thaw cycles. The reaction is sensitive to contaminants like EDTA or phenol which inhibit polymerase activity.
Main Applications
Standard PCR serves as the workhorse for DNA cloning, genotyping, and mutation detection across life sciences. In research, it's used for gene expression analysis (via RT-PCR), library construction, and template preparation for sequencing. Clinical applications include infectious disease detection (HIV, HBV), genetic disorder screening (cystic fibrosis), and paternity testing. Industrial uses cover GMO detection in food safety and species identification in agriculture. Compared to real-time PCR, standard PCR is preferred when quantitative data isn't required, or when working with limited budgets. It's also the first step in techniques like RFLP analysis and TA cloning.
Safety and Storage
PCR reagents require careful handling to prevent degradation and contamination. Always wear gloves and use aerosol-resistant tips to avoid cross-contamination between samples. Enzyme stocks should be aliquoted to minimize freeze-thaw cycles and stored at -20°C in non-frost-free freezers. Waste disposal must follow biohazard protocols for DNA-containing materials. UV decontamination of work surfaces and dedicated pipettes help prevent false positives. For long-term storage of amplified products, add EDTA to chelate Mg²⁺ and inhibit nucleases. Always include negative controls to monitor contamination risks.
B2B Procurement Guide
When sourcing standard PCR kits, prioritize suppliers with ISO 13485 certification for consistent quality. Key specifications to compare include: Taq polymerase fidelity (error rate ≤1×10⁻⁴ bases/cycle), dNTP purity (HPLC-verified), and buffer composition (with or without loading dye). Bulk purchases (500+ reactions) typically offer 20-30% cost savings. Consider ready-to-use master mixes for high-throughput labs to reduce pipetting errors. For specialized applications, verify primer compatibility or opt for customized kits. Leading manufacturers include Thermo Fisher, QIAGEN, and NEB, with regional distributors often providing better logistical support.
Related Manufacturers
- 主营：牛奶分析仪、液体密度计、手持辣度计、梯度pcr扩增仪、牛奶冰点仪、程控定量封口机、凯氏定氮仪、微波消解仪、超微量分光光度计、固相萃取仪、水质检测仪、食品安全检测仪、电位滴定仪、光合作用测定仪、尘埃粒子计数器、全自动菌落计数器、土壤养分检测仪
- 主营：试剂盒、去垢剂、蛋白质、光染料、醛基磁珠、活化磁珠、重组蛋白、疏水磁珠、巯基磁珠、纯化磁珠、羧基磁珠、羟基磁珠、氨基磁珠、蛋白多肽、亲和磁珠、蛋白a磁珠、蛋白g磁珠、蛋白l磁珠、蛋白a-g磁珠、游离生物素、炔烃基磁珠、高效清除磁珠、氰基丙基磁珠、叠氮化物磁珠、蛋白清除磁珠
- 主营：二手贝克曼流式细胞仪、赛默飞PCR仪、赛默飞二氧化碳培养箱、赛默飞超低温冰箱、艾本德离心机、赛默飞离心机、赛默飞光度计、液氮罐、伯乐荧光定量PCR、国产PCR、二手仪器、超声波细胞破碎仪、色谱
- 主营：离心机、色谱仪、显微镜、洗板机、气相色谱仪、电穿孔仪、蛋白纯化系统、PCR仪、光谱仪、培养箱、高压杀菌锅、切片机、分光光度计、超纯水仪、摇床、电泳仪、超低温冰箱
- 主营：电转仪、电泳仪、扩增仪、梯度pcr、pcr仪器、冻存架、液氮罐、移液器、转印槽、荧光计、混匀仪、混匀器、储存箱、培养箱、振荡器、电阻仪、显微镜、干浴器、水浴锅、冷藏箱、冷藏柜、浓缩仪、离心机、搅拌器、保存箱
- 主营：真空泵、八连管、滤芯吸头、pcr仪、原位杂交仪、转印芯模块、灭菌加长吸头
- 主营：[]
- 主营：PCR仪、实时荧光定量PCR仪、细胞计数器、赛默飞pcr、荧光计、紫外分光光度计、离心机、电泳仪电泳槽、电泳电源、凝胶成像、生物显微镜、倒置显微镜、二氧化碳培养箱、移液器、冷藏冷冻冰箱、液氮罐
- 主营：毛细管、微量点样器、细胞破碎仪、显微注射器、超声波破碎仪、微量注射点样器
- 主营：线缆挤、眼镜架、玻纤填、片管材、骨架件、保护膜、耐消毒、导光板、聚合物、日用品、内润滑、开关件、玻璃珠、聚碳酸、易流动、反射板、传感器、阻燃5va、化妆品、型棒材、透明罩、透明料、食品件、玻璃球、摩配件
- 主营：电位滴定仪、农药残留检测仪、尘埃粒子计数器、食品安全检测仪、残氧仪、酸价过氧化值检测仪、大米重金属检测仪、浮游菌采样器、atp荧光检测仪、光合作用测定仪、大豆蛋白仪、果蔬呼吸测定仪
- 主营：农药残留检测仪、食品安全检测仪、土壤养分检测仪、兽药残留检测仪、光合作用测定仪、程控定量封口机、牛奶分析仪、酶标仪、稻谷新鲜度测定仪、土壤肥料养分检测仪、土壤研磨机、微波消解仪、气相色谱仪、直链淀粉测定仪、红外分光测油仪、食品重金属检测仪、辣度检测仪、液体密度计、脂肪酸值测定仪、油液颗粒计数器、凯氏定氮仪、电位滴定仪、病害肉检测仪、拉曼光谱仪、水质检测仪
- 主营：食品安全检测仪、农药残留检测仪、大豆蛋白仪、尘埃粒子计数器、凯氏定氮仪、电位滴定仪、程控定量封口机、土壤养分检测仪、光合作用测定仪、土壤呼吸测定仪、红外CO分析仪、红外测油仪、浮游菌采样器、残氧仪、COD消解仪、超微量分光光度计、生物毒性检测仪、液体密度计、闪点测试仪、微波消解仪
- 主营：超微量分光光度计、电位滴定仪、凯氏定氮仪、土壤呼吸测定仪、尘埃粒子计数器、乳制品分析仪、果蔬呼吸测定仪、水质检测仪、红外测油仪、光合作用测定仪、液体密度计、农药残留检测仪、土壤养分检测仪、食品安全检测仪、微波消解仪、气相色谱仪
- 主营：离心机、PCR仪、实时荧光定量、电穿孔仪、移液器、分光光度计、凝胶成像