Enzyme substrates, culture media containing same and use thereof in order to detect aminopeptidase activity and/or differentiate gram-positive bacteria from gram-negative bacteria
申请人:James Arthur
公开号:US20060035306A1
公开(公告)日:2006-02-16
The present invention relates to novel chromogenic substrates which are used to detect aminopeptidase activity in microorganisms or to determine whether at least one bacterium belongs to the Gram-positive group or to the Gram-negative group according to the color thereof. The invention also relates to culture media containing such substrates, to the use of the substrates or media for the detection of aminopeptidase activities and/or the differentiation of Gram-positive bacteria from Gram-negative bacteria and to methods of use.
The aforementioned novel substrates have the formula below:
in which:
R
1
is nothing or an alkyl, allyl or aryl group,
R
2
consists of at least one amino acid, preferably alanine,
R
3
, R
4
, R
5
and R
6
consist, independently of one another, of H— or —O-alkyl, preferably —O—CH
3
,
R
7
consists of H, O—CH
3
, alkyl or halogen,
R
8
consists of H or Cl, and n is an integer corresponding to 0 or 1. The invention is particularly suitable for use in the field of diagnostics.
本发明涉及一种新型的显色底物,用于检测微生物中的氨基肽酶活性,或根据其颜色确定至少一种细菌属于革兰氏阳性群或革兰氏阴性群。该发明还涉及含有这种底物的培养基,以及利用这些底物或培养基检测氨基肽酶活性和/或区分革兰氏阳性细菌和革兰氏阴性细菌的用途和使用方法。
上述新型底物的化学式如下:
其中:
R1为无或烷基、烯丙基或芳基,
R2由至少一种氨基酸组成,最好是丙氨酸,
R3、R4、R5和R6独立地由H-或-O-烷基组成,最好是-O-CH3,
R7由H、O-CH3、烷基或卤素组成,
R8由H或Cl组成,n是对应于0或1的整数。该发明特别适用于诊断领域。