Why is alkaline Peptone Water used for Vibrio?

Why is alkaline Peptone Water used for Vibrio?

Alkaline Peptone Water (CM1028) is for the enrichment of Vibrio cholera and Vibrio species from food, water and clinical samples. The 2% (w/v) sodium chloride incorporated in this medium promotes the growth of Vibrio cholerae, while the alkalinity of this medium inhibits most of the unwanted background flora.

What type of media is alkaline Peptone Water?

Alkaline Peptone Water is a broth medium for the enrichment of Vibrio species from food, water and clinical samples. Shread, et al. formulated peptone water for use as a nonselective enrichment broth for the cultivation of Enterobacteriaceae from foodstuffs and other specimens.

What is buffered peptone water used for?

According to ISO 21528, Buffered Peptone Water is used for detection or enumeration of Enterobacteriaceae within foodstuffs. Used as diluent, Buffered Peptone Water complies with ISO 6887 and 11290 for the enumeration of organisms.

What is the Colour of Peptone Water?

reddish-pink
Andrade Peptone Water is reddish-pink when hot; it should return to a colourless or a slightly pink colour when cooled to room temperature. Some sugar solutions may affect the pH of the Peptone Water; check and correct if so.

How do you prepare for APW?

Preparation of Alkaline Peptone Water

1. To make about 50 bottles (i.e. 500 ml), you will need 5 g of peptone and 5 g of Sodium chloride.
2. Dissolve the peptone and sodium chloride in the water.
3. Adjust the reaction of the medium to pH 8.6 to 9.0 using 1 mol/L sodium hydroxide.

How do you make peptone water broth?

Suspend 15 grams of Peptone Water in 1000 ml of distilled water. Add the test carbohydrate in the desired quantity and dissolve completely. Dispense in tubes with or without inverted Durham’s tubes and sterilize by autoclaving at 15 lbs. pressure (121 °C) for 15 minutes.

Is alkaline peptone water enrichment media?

Alkaline peptone water is an enrichment medium used for Vibrio cholerae and other Vibrio The pH of the medium ranges from 8.6-9.0. The alkalinity of the medium favors the growth and multiplication of Vibrio species while inhibiting the growth of faecal coliforms and other commensals.

How do you use alkaline peptone water?

B. For use as a transport medium

1. When cholera is suspected, transfer about 1 ml of specimen into 10 ml of sterile alkaline peptone water.
2. The inoculated medium should reach laboratory within 8 hours of collection (Proteus species will grow eventually in alkaline peptone water.)

What is the difference between peptone water and buffered peptone water?

Neutralizing buffered peptone water is similar to buffered peptone water, but it includes sodium thiosulfate and lecithin as additional agents that act to “neutralize” acids and sanitizers.

How do you make tryptone water?

Tryptone Water is used for the detection of indole production by coliforms. Dissolve 25 grams in 1000 ml distilled water. Heat if necessary to dissolve the medium completely. Dispense into tubes and sterilize by autoclaving at 15 lbs pressure (121°C) for 15 minutes.

How do you sterilize peptone water?

Preparation Instructions Suspend 15 grams of Peptone Water in 1000 ml of distilled water. Add the test carbohydrate in the desired quantity and dissolve completely. Dispense in tubes with or without inverted Durham’s tubes and sterilize by autoclaving at 15 lbs. pressure (121 °C) for 15 minutes.

What is Oxoid peptone bacteriological used for?

The Oxoid Peptone Bacteriological is for use whenever a high quality bacteriological peptone is required.

What is oxoxoid’s RV enrichment broth?

Oxoid’s Rappaport-Vassiliadis (RV) Enrichment Broth is similar to that described by Vassiliadis et al.3 except that the peptone used is soya peptone, which has been reported to enhance the growth of salmonellae1,11.

How do I prepare xlt-4 selective agar?

Suspend 59g of XLT-4 Agar Base in 1 litre of distilled water, add 4.6ml of XLT-4 Selective Supplement and bring the medium to the boil. Do not overheat, do not autoclave. Cool to approximately 50°C and pour into sterile Petri dishes. It is not advised to hold the medium at 50°C for longer than 1 hour as this may cause the medium to precipitate.

How do you reconstitute Oxoid Rappaport-Vassiliadis (RV)?

The directions for reconstituting Oxoid Rappaport-Vassiliadis (RV) Enrichment Broth follow usual Oxoid practice and specify the weight needed for 1 litre of medium. Add 30g (the equivalent weight of dehydrated medium per litre) to 1 litre of distilled water. Heat gently until dissolved completely.