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655017 - ČSN P CEN/TS 17716 - Rostlinné biostimulanty - Stanovení Escherichia coli | ||
| Název : 655017 - ČSN P CEN/TS 17716 - Rostlinné biostimulanty - Stanovení Escherichia coli
Označení normy : ČSN P CEN/TS 17716 Katalogové číslo : 515433 Třídící znak : 655017 Účinnost : 2022-12-01 Věstník : 2022.11 Strany : 24 Převzata :vyhlášením ve Věstníku - v angličtině | ||
| Cena : | 335.00 Kč (DPH= 0%), s DPH= 335.00 Kč | |
| ANOTACE "ČSN P CEN/TS 17716 This document gives general guidelines for the detection and identification of the specified microorganism Escherichia coli in technical and formulated biostimulant products, both in liquid and solid state, and also the horizontal method for the enumeration of ß-glucuronidase-positive Escherichia coli in plant biostimulants products (both in liquid and solid state). The qualitative method described in this document is based on the detection of Escherichia coli in a non-selective liquid medium (enrichment broth), followed by isolation on a selective agar medium. Other methods can be appropriate, depending on the level of detection required. NOTE - For the detection of Escherichia coli, subcultures can be performed on non-selective culture media followed by suitable identification steps (e.g. using identification kits). The quantitative method described in this document uses a colony-count technique at 44 st.C on a solid medium containing a chromogenic ingredient for detection of the enzyme ß-glucuronidase. WARNING - Strains of Escherichia coli which do not grow at 44 st.C and, in particular, those that are ß-glucuronidase negative, such as Escherichia coli O157, will not be detected." | ||