Colorimetric Detection of Cortex Degradation During Bacterial Spore Germination

A bacterial spore remains dormant due to a peptidoglycan cortex layer, a polymer of sugars and amino acids.

During germination, the cortex degrades to release sugars into the surrounding medium.

To detect cortex degradation, begin with the medium containing the released sugars, collected at defined time points during spore germination.

Use increasing concentrations of sugar standards for reference.

The standards and the samples underwent a prior treatment to convert the sugars into a reactive form.

Incubate with Ehrlich's reagent, a colorimetric detection reagent that reacts with sugars and forms a purple-colored complex.

Transfer the mixtures to a multiwell plate and measure the absorbance of the colored complexes using a microplate reader.

The absorbance corresponds to the purple color intensity, which is directly proportional to the sugar concentration.

An increase in absorbance across time-point samples indicates progressive cortex degradation.

Generate a graph from the standard concentrations and quantify the sample concentrations.

While the samples are on ice, prepare the color reagent. Dissolve 0.320 grams of DMAB in 1.9 milliliters of glacial acetic acid. Note that this reagent is ti