In this article, we present a protocol for measuring the pH of cell-free bacterial-conditioned media using UV-Vis absorbance spectrum and litmus paper as the indicator. This method is flexible and can accommodate both high-volume and low-volume sample sets.
We present a protocol for measuring the pH of cell-free bacterial-conditioned media based on changes in the ultraviolet-visible (UV-Vis) absorbance spectrum using the pH indicator dye litmus. This protocol includes detailed procedures for performing bacterial culturing, examining bacterial growth, collecting cell-free supernatant, litmus dye addition, and pH-based calibration curve preparations. This assay has been designed for flexible formatting that can accommodate both high-volume and low-volume sample sets.
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