three media used for glucose fermentation.

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Glucose is a sugar from which most common chemoheterotrophic bacteria can obtain energy by fermentation and/or respiration. Glucose can also be utilized as a source of carbon, but these media include a large number of potential carbon sources (amino acids as well as glucose), and whether or not glucose is used as a carbon source cannot be directly determined from the reactions seen in these media.
Peptone is a commonly-used medium ingredient which mainly supplies amino acids (sources of nitrogen, carbon, sulfur and energy for many bacteria). A minimum amount of peptone should be incorporated in the medium, as overabundance of ammonium (alkaline) released from deamination of amino acids can neutralize the acids.
pH indicator: Brom-thymol blue turns yellow with a net acidic pH and blue with a net alkaline pH.

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