ROTI®Plate90 XLD, ISO 6579-1, ready-to-use, steril, 10 unit(s), box

Sterile ready-to-use culture media plates for microbiological analysis.

ROTI^®Plate90 are prepared culture media plates with a diameter of 90 mm. They are thus adapted to the size of membrane filters for assaying of low-germ fluids by membrane filtration method. They are also applicable for the microbiological analysis of samples in general. The germs of expected low-germ liquid samples are concentrated by membrane filtration. Afterwards, the membrane is placed on top of the medium and incubated. Using a membrane with a grid helps counting the resulting colonies.Our products are tested and approved exclusively for research and development.

Samples which are expected to have a higher microbiological burden are prepared in a serial dilution. Afterwards, every dilution step is plated and incubated. The number of grown colonies is noted as result.

ISO 6579 recommends XLD agar for the identification and presumptive identification of Salmonella after pre-enrichment in a non-selective liquid medium.

The degradation of the three fermentable carbohydrates xylose, lactose and sucrose, with the production of acid, is shown by the colour change from red to yellow.Sodium thiosulphate serves as a reactive substance with ammonium iron(III) citrate as an indicator for the production of H₂S under alkaline conditions. Phenol red serves as a pH indicator.