pH-indicator films based on soy protein isolate/bromothymol blue and methyl red for (CAT#: STEM-PPA-0036-LJX)

Introduction

Intelligent pH-indicator films based on soy protein isolate (SPI) were prepared using pH-sensitive dyes (bromothymol blue and methyl red). The addition of mixed indicators imparts pH-indicator films with an appreciable microstructure, acceptable water resistance, and favorable optical properties. The incorporation of the mixed indicators did not lead to significant improvement in the mechanical properties of films due to weak ionic cross-linking by hydrogen bonding between the SPI macromolecules and low-molecular-weight indicators.

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Principle Applications Procedure Materials Notes Related Products

Principle

Acid-base indicators produce different colors in aqueous solutions of their specific pH range. The indicator is added to the standard buffer solution, and the resulting color is used as the standard colorimetric tube. The pH value of the water sample can be measured by visual colorimetric comparison with the water sample colorimetric tube with the same indicator.

Applications

For determining the approximate PH value of solutions in food production, wastewater treatment, pharmaceutical and chemical industries

Procedure

1. Add ph indicator to the standard solution, and the solution with different pH will show different colors. Use these solutions as standard colorimetric tubes
2. Add the same ph indicator to the solution to be tested, and compare the color of the solution to be tested with the standard colorimetric tube to determine the approximate ph value of the solution

Materials

• Sample Type:
Apple

Notes

After dropping the indicator into the solution, it should be gently shaken to avoid inaccurate detection.

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