—————热启动、速度快、高特异性、可冻干、符合研发生产一体化
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HaiGene Bst4.2系列LAMP相关试剂是HaiGene精心研制的高性能的LAMP扩增用试剂,通用于DNA或RNA的靶标检测。在快速、高耐受性的基础上,不仅实现稳定、快速、高灵敏度的扩增性能,在HotStart性能的加持下,还实现了假阳性的大幅下降。
制品性能特点:
(1) Bst4.0全系包含热启动Aptamer,该配体确保酶在<30℃时,酶活封闭效率>90%,在>60℃时1min内完全释放酶活。该特性利于室温建立反应体系,并大幅降低了低温条件下的非特异扩增。
(2) Bst4.2系列反应温度提升到70℃,大幅降低引物Dimer的形成,提高扩增特异性,并使得粗样品核酸释放更加充分。
(3) Bst4.2系列包含Helicaser,因此,允许在不使用F3/B3引物的情况下进行eLAMP扩增(easy LAMP),并允许FIP/BIP的引物用量降低一倍。这将进一步降低非特异扩增,并使得扩增均一性大幅提升。
(4) 预冻干液体形式的试剂,赋予多用途性,不仅能满足常规的科研需求,还使得冻干产品开发和生产在一种试剂下同步完成。
| Bst2.0 (A3801) |
Bst3.0 (A3901) |
Bst4.0 (A3805) |
热启动Bst4.2 (A3831-00) |
热启动Bst dU5.0 (A3861-00) |
|
| 热启动功能 | 否 | 否 | 否 | 是 | 是 |
| 酶储存液 | 50%甘油 | 50%甘油 | 50%甘油 | 无甘油 | 无甘油 |
| 反应温度 | 65℃ | 65℃ | 65℃ | 70℃ | 65~70℃ |
| 检测底物 | DNA | DNA | DNA/RNA | DNA/RNA | DNA/RNA |
| dUTP使用能力 | 50% | 50% | 50% | 50% | 100% |
| 扩增速度 | ★★★ | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★ |
| LAMP Mix供货 | 不提供 | 不提供 | 不提供 | A3831-20基础预混液(dNTP) A3831-21荧光预混液(dNTP) A3831-22变色预混液(dNTP) |
A3861-20基础预混液(全dUTP) A3861-21荧光预混液(全dUTP) |
| LAMP冻干品供货 | 不提供 | 不提供 | 不提供 | A3831-56变色冻干球(dNTP) | A3861-22基础冻干瓶(全dUTP) A3861-23荧光冻干瓶(全dUTP) A3861-24基础冻干球(含UDG酶) A3861-25荧光冻干球(含UDG酶) |
1、Bst 4.2 HotStart功能展示
采用荧光酶活测定法在30℃和60℃条件下测定HotStart Bst 4.2,结果显示与未加入Aptamer的对照比较来看。HotStart Bst 4.2在30℃条件下酶活几乎无活性,而60℃条件下1min内酶活完全释放,恢复100%活性。

2、以Bst 4.2 SYBR Green试剂进行标准LAMP和eLAMP扩增比较
以human Total RNA为模板,采用RnaseP LAMP Primer进行标准LAMP和eLAMP 扩增。在25ul扩增体系中加入10ng、1ng和0ng的RNA,70℃反应40min。从扩增结果可获得,在Helicaser的加持下F3/B3可完全去除,对扩增速度几乎无影响,并且非特异性扩增得到改善。 6 Primer LAMP引物浓度:FIP/BIP=0.8 μM; LoopF/B=0.4 μM; F3/B3=0.1 μM。 4 Primer eLAMP引物浓度:FIP/BIP=0.8 μM; LoopF/B=0.4 μM。

3、以Bst 4.2 Basic试剂进行DP-eLAMP探针法扩增
在众多的探针法LAMP测试中,DP-LAMP探针法(Displaceable Probe LAMP)为HaiGene推荐的使用方法(参考PMID: 33626039)。在LAMP扩增中将LF或LB引物退火至互补的猝灭oligo,利用链置换活性获得游离的荧光信号(可参考HaiGene A3831-57说明书资料)。该方案可进一步降低LAMP的非特异扩增。下图为DP-eLAMP进行三种荧光标记探针的实验数据。结果显示HotStart Bst4.2总能获得高特异性和高重复性的扩增。

4、以Bst4.2 L-HNB 试剂进行L-HNB (紫罗兰-淡绿) 变色反应(肉眼观察)
以2019-nCoV体外转录RNA为模板,采用eLAMP扩增法(FIP/BIP=0.8 μM; LoopF/B=0.4 μM), 对10000、1000、100、25copies/管的阳性RNA进行检测,ddH20为阴性对照(4重复)。下图为70℃反应30min 后的检测结果。结果表明L-HNB法获得清晰易于区分的颜色变化,极易区分阳性和阴性扩增。

5、以Bst4.2 L-HNB (紫罗兰-淡绿) 变色反应对反应缓冲盐Tris的耐受性测试
以2019-nCoV体外转录RNA为模板,采用eLAMP扩增法(FIP/BIP=0.8 μM; LoopF/B=0.4 μM), 对1000copies/管的阳性RNA进行检测(2重复),ddH20为阴性对照(2重复)。下图为70℃反应30min 后的检测结果。结果表明L-HNB法,在1x浓度下可耐受10mM Tris-HCl的缓冲盐,阳性样本仍然可以充分的变色。该变色方法不受样本中缓冲盐影响。

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