CN107723334A - 一种产ESBLs细菌检测试剂和检测产ESBLs细菌的试剂盒 - Google Patents
一种产ESBLs细菌检测试剂和检测产ESBLs细菌的试剂盒 Download PDFInfo
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Abstract
本发明公开了一种产ESBLs细菌检测试剂,其中包括胰酪胨、酵母浸粉、牛肉浸粉、NaCl、3‑吗啉丙磺酸、丙酮酸钠、硝酸钾、海藻糖、酚红、亚甲基蓝、制霉菌素、牛胆盐、万古霉素等成分。为方便检测,本发明将该检测试剂应用于检测产ESBLs细菌试剂盒中。本发明通过科学配制的检测试剂,可对样本中的产ESBLs细菌进行直接检测,且试剂成本低;通过在检测板上包被特殊底物、生长因子、抑制剂,使产ESBLs细菌特异性生长,从而对产ESBLs细菌进行及时检测,给临床提供了科学有效的指导,对预防控制院内感染的流行具有重要价值,而检测结果只需要目测,无需借助其他专用设备,满足了不同客户群的需求;同时由于其检测周期短,24小时内即能出结果,有利于患者的早期诊断和治疗。
Description
技术领域
本发明涉及体外诊断技术领域,尤其是涉及一种产ESBLs细菌检测试剂,本发明还涉及检测产ESBLs细菌的试剂盒。
背景技术
超广谱β-内酰胺酶(extended-spectrum β-lactamase,ESBLs)是肠杆菌科细菌对β-内酰胺类抗菌药物产生耐药的主要机制之一,自1982年在英格兰首先发现产超广谱β-内酰胺酶(extended-spectrum β-lactamase,ESBLs)克雷伯菌后,产ESBLs细菌的流行在世界各地广泛报道,其预防与治疗已成为临床医生需要面对的重要问题。ESBLs主要存在于临床分离的革兰阴性杆菌,其中又多见于肠杆菌科细菌。在肠杆菌科细菌中以大肠埃希菌和克雷伯菌最为常见,克雷伯菌包括肺炎克雷伯菌和产酸克雷伯菌。其他常见产ESBLs细菌有产气肠杆菌、变形杆菌、沙门属菌、阴沟肠杆菌、粘质沙雷菌、铜绿假单胞菌、不动杆菌属等。
各个国家和地区产ESBLs细菌的发生率明显不同。日本、荷兰等国家产ESBLs细菌的发生率很低,而法国、印度等国家产ESBLs细菌的发生率很高,可有高达50%以上的克雷伯菌属的细菌产生ESBLs,而且具有较严重的耐药性。我国大陆不同研究者报告的产ESBLs细菌发生率各有不同,大肠埃希菌发生率大约在40%,肺炎克雷伯菌发生率更低一些。
产ESBLs细菌主要在医院内引起感染和流行,其中60%发生在大型医院,特别是教学医院。产ESBLs细菌不仅能引起院内暴发流行,还可以向院外传播,使流行范围扩大。研究显示,重症监护病房、住院日延长(≥7d)、机械通气、导尿管和动脉导管的留置、严重疾病状态(如器官移植)、不适当联合使用抗菌药物或三代头孢菌素、年龄≥60岁等都是导致产ESBLs细菌感染的危险因素。
临床产ESBLs细菌的检测方法主要包括有:纸片扩散法(K-B法),肉汤稀释(MIC)法,琼脂稀释(MIC)法,浓度梯度(E试验)法,自动化药敏检测,琼脂显色筛选法及分子生物学技术。其中纸片扩散法(K-B法),肉汤稀释(MIC)法,琼脂稀释(MIC)法,浓度梯度(E试验)法,自动化药敏检测这几种方法是传统的耐药菌检测主要方法和手段,是公认的敏感性检测方法,也是当前临床耐药菌检测的主要方法,但是这些检测方法面对的均是临床分离活化后的菌株,针对临床样本是无法直接使用的,存在操作麻烦、检测周期长的问题。琼脂显色筛选法和分子生物学法是近几年新型的耐药菌检测技术,可以直接进行耐药菌的检测,有效缩短了检测周期,但由于检测成本高,在使用中受到一定的限制。
发明内容
本发明的目的在于提供一种产ESBLs细菌检测试剂,本发明还提供操作方便、检测周期短且成本低的产ESBLs细菌检测试剂盒。
为实现上述目的,本发明可采取下述技术方案:
本发明所述的产ESBLs细菌检测试剂,其检测试剂溶液中包括有以下成分(按质量浓度计):0.1~3%的胰酪胨,0.1~2%的酵母浸粉,0.05~1%的牛肉浸粉,0.1~2%的NaCl,0.05~2%的3-吗啉丙磺酸,0.05~2%的丙酮酸钠,0.05~2%的硝酸钾,0.05~2%的海藻糖,0.006%的酚红,0.0001-0.01%的亚甲基蓝,0.001%的制霉菌素,0.015%的牛胆盐,0.001%的万古霉素。
本发明所述的一种产ESBLs细菌检测试剂盒,包括带有培养液、矿物油和检测板的盒体,所述检测板上间隔设置有阳性孔和产ESBLs细菌检测孔;所述阳性孔和产ESBLs细菌检测孔内分别包被有上述检测试剂,其中每孔的包被量为100ul;所述培养液为含有0.5-1%的氯化钠溶液,所述矿物油为液体石蜡油。
所述产ESBLs细菌检测孔至少包含检测头孢噻肟、头孢他啶和氨曲南三种抗生素中一种以上的产ESBLs细菌的检测孔。
所述头孢噻肟检测孔中包被有1-8ug/mL的头孢噻肟,所述头孢他啶检测孔中包被有1-8ug/mL的头孢他啶;所述氨曲南检测孔中包被有1-8ug/mL的氨曲南,每孔的包被量均为100ul。
本发明试剂盒使用时,首先将待检样本加入培养液中搅拌混匀,然后将其分别接种进阳性孔和产ESBLs细菌检测孔中,每孔100 ul;再分别滴加一滴矿物油,盖上检测板盖后置于36~38℃培养,24h后通过颜色变化直接观察结果。
本发明的优点在于通过科学配制的检测试剂,可对样本中的产ESBLs细菌进行直接检测,且试剂成本低;将其制作成试剂盒后,由于在检测板的检测孔内包被了包含胰酪胨、酵母浸粉、牛肉浸粉等具有丰富营养成分和生长因子的物质,并选择制霉菌素、牛胆盐、万古霉素等作为抑制剂,因此能使产ESBLs细菌特异性生长,从而对产ESBLs细菌进行及时检测,给临床提供了科学有效的指导,对预防控制院内感染的流行具有重要价值,而检测结果只需要目测,无需借助其他专用设备,满足了不同客户群的需求;同时由于其检测周期短,24小时内即能出结果,有利于患者的早期诊断和治疗。
附图说明
图1是本发明试剂盒的结构示意图。
图2是图1中检测板的放大图。
具体实施方式
下面通过具体实施例对本发明做更加详细的说明。
本发明配制的产ESBLs细菌检测试剂溶液中包含有以下成分:0.1~3%的胰酪胨(优选2%),0.1~2%的酵母浸粉(优选1%),0.05~1%的牛肉浸粉(优选0.2%),0.1~2%的NaCl(优选2%),0.05~2%的3-吗啉丙磺酸(优选1%),0.05~2%的丙酮酸钠(优选0.05%),0.05~2%的硝酸钾(优选0.5%),0.05~2%的海藻糖(优选0.5%),0.006%的酚红,0.0001-0.01%的亚甲基蓝(优选0.002%),0.001%的制霉菌素,0.015%的牛胆盐,0.001%的万古霉素。
为方便检测,本发明将上述检测试剂应用于检测产ESBLs细菌的试剂盒中,如图1所示,该试剂盒包括带有培养液1、矿物油2和检测板3的盒体4,在检测板3上间隔设置有阳性孔3.1和产ESBLs细菌检测孔,将上述配制的检测试剂按每孔100 ul的包被量对阳性孔3.1和检测孔进行包被。实际制作时,产ESBLs细菌检测孔可以设计为一个(仅测量一种产ESBLs细菌),也可以同时设计两个或更多。
本发明的产ESBLs细菌检测孔设计有三个,如图2所示,一次性可以同时对三种不同的产ESBLs细菌进行检测:包被有1-8ug/mL(优选5ug/mL)头孢噻肟的检测孔3.2,包被有1-8ug/mL(优选5ug/mL)头孢他啶的检测孔3.3,包被有1-8ug/mL(优选5ug/mL)氨曲南的检测孔3.4;每孔的包被量同样都为100ul。
本发明试剂盒所用的培养液1为含有0.5-1%的氯化钠溶液,所用矿物油2为液体石蜡油。
使用时,将待检样本加入培养液1中搅拌混匀;然后将其接种入检测板3的阳性孔3.1和三个检测孔3.2、3.3、3.4中,每孔100 ul,然后分别滴加矿物油2一滴,盖上检测板盖后置于36~38℃培养,24h观察结果,如果孔内有菌生长,则颜色从蓝紫色变为黄色或其他颜色,具体判断方法如下:
若阳性孔3.1不变色,无论检测孔是否变色,待检样本均判断为阴性;
若阳性孔3.1变色,但头孢噻肟检测孔3.2,头孢他啶检测孔3.3,氨曲南检测孔3.4均不变色,则待检样本为阴性;
若阳性孔3.1变色,且头孢噻肟检测孔3.2,头孢他啶检测孔3.3,氨曲南检测孔3.4三个检测孔中有一个或多个变色,则待检样本为阳性。
Claims (4)
1.一种产ESBLs细菌检测试剂,其特征在于:所述检测试剂溶液中包括有以下成分:0.1~3%的胰酪胨,0.1~2%的酵母浸粉,0.05~1%的牛肉浸粉,0.1~2%的NaCl,0.05~2%的3-吗啉丙磺酸,0.05~2%的丙酮酸钠,0.05~2%的硝酸钾,0.05~2%的海藻糖,0.006%的酚红,0.0001-0.01%的亚甲基蓝,0.001%的制霉菌素,0.015%的牛胆盐,0.001%的万古霉素。
2.一种产ESBLs细菌检测试剂盒,包括带有培养液、矿物油和检测板的盒体,其特征在于:所述检测板上间隔设置有阳性孔和产ESBLs细菌检测孔;所述阳性孔和产ESBLs细菌检测孔内分别包被有权利要求1所述的检测试剂;所述培养液为含有0.5-1%的氯化钠溶液,所述矿物油为液体石蜡油。
3.根据权利要求2所述的产ESBLs细菌检测试剂盒,其特征在于:所述产ESBLs细菌检测孔至少包含检测头孢噻肟、头孢他啶和氨曲南三种抗生素中一种以上的产ESBLs细菌的检测孔。
4.根据权利要求3所述的产ESBLs细菌检测试剂盒,其特征在于:所述头孢噻肟检测孔中包被有1-8ug/mL的头孢噻肟,所述头孢他啶检测孔中包被有1-8ug/mL的头孢他啶;所述氨曲南检测孔中包被有1-8ug/mL的氨曲南,每孔的包被量均为100ul。
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