Compounds of formula (I)
1
in which R
1
,R
2
,R
3
,R
4
and R
5
are hydrogen atoms or chromogenic substituents and X is hydroxyl, OR
6
wherein R
6
is selected from the group consisting of C
1
-C
4
alkyl, or O
−
Me
+
wherein Me
+
is a cation derived from an organic or inorganic base; these compounds do not exhibit significant fluorescence but are capable of being cleaved by phosphatidyl-inositol-specific phospholipase C, an enzyme which is indicative of bacterial activity; the umbelliferyl moity resulting from such cleavage is a strong fluorogen thus providing effective test methods for various pathogenic bacteria, such as Listeria, Staphylococcus and Clostridium species. Also disclosed are plating media for detection of microorganisms that are capable of metabolic generation of a phosphatidyl inositol-specific phospholipase C (PI—PLC). The plating medium can be in a dry, liquid, or semi-liquid form, depending upon its water content, and comprise at least one compound capable of forming an aqueous gel when in contact with water; at least one nutrient capable of supporting growth of said microorganism; and at least one indicator compound of formula I and/or IV, notably 4-methylumbelliferyl myo-inositol-1-phosphate or salts thereof and 5-bromo-4-chloro-3-indoxyl myo-inositol-1-phosphate or salts thereof. PI—PLC generated by the microorganisms of interest leads to cleavage of the indicator compounds causing formation of fluorescence and/or color suitable for identification of type and count of such hygienically and pathologically important microorganisms as Listeria species.
式(I)化合物
1
其中 R
1
,R
2
,R
3
,R
4
和 R
5
是氢原子或变色取代基,X 是羟基、OR
6
其中 R
6
选自由 C
1
-C
4
烷基或 O
-
我
和加号;
其中 Me
+
是来自有机或
无机碱的阳离子;这些化合物不显示明显的荧光,但能被
磷脂酰肌醇特异性
磷脂酶 C 裂解,这种酶是细菌活性的指示剂;由这种裂解产生的伞形基莫伊特是一种强荧光剂,从而为各种病原菌,如李斯特菌、葡萄球菌和梭状芽孢杆菌提供了有效的检测方法。还公开了用于检测能代谢产生
磷脂酰肌醇特异性
磷脂酶 C(
PI-PLC)的微
生物的电镀
培养基。电镀
培养基可以是干的、液态的或半液态的,取决于其含
水量,并包含至少一种与
水接触时能形成
水凝胶的化合物;至少一种能支持所述微
生物生长的营养物;以及至少一种式 I 和/或式 IV 的指示剂化合物,特别是
4-甲基伞形酮酰肌醇-1-
磷酸酯或其盐和 5-
溴-4-
氯-3-
吲哚酮酰肌醇-1-
磷酸酯或其盐。由相关微
生物产生的
PI-PLC 会导致指示化合物裂解,从而形成荧光和/或颜色,适用于识别李斯特菌等在卫生和病理方面具有重要意义的微
生物的类型和数量。