Indicating the tuna freshness by curcumin/alizarin Ph-sensitive protein fiber membrane (CAT#: STEM-PPA-0062-LJX)

Introduction

In this paper, pH-sensitive zein/gelatin (ZG) fiber membranes incorporated with curcumin (CUR) and/or alizarin (ALI) were prepared by electrospinning. The pH sensitivity of each ZG fiber membrane was analyzed. The influences of different pigments on the morphology, structure, heat resistance and water resistance of ZG fiber membrane were compared by scanning electron microscopy (SEM), infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and water contact angle (WCA). Furthermore, the freshness indicator effect of different ZG fiber membranes on tuna fillets stored at 4 % was evaluated.

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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:
Tuna

Notes

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

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