pH dynamics as a key indicator of stability in Herbal Surface cleaners: A comprehensive Longitudinal and statistical study.

Abstract

This research explores the pH stability as an important factor affecting the stability of herbal surface cleaners by longitudinal and statistical analysis. The leaves of Azadirachta indica and peels of Citrus limon were used to prepare herbal extracts at 3-7% at three different temperatures: 25°C (ambient), 30°C (tropical) and 45°C (stressful). The pH levels were measured once a week and was found to be increasing in instability, with an increase above +1.9 at 45°C. Cross-correlation analysis of the pH with the changes in structure, sensory and microbiological properties showed that when pH increased above 3.90, the associated changes were indicative of a transition to failure; and when pH decreased below 5.20, the associated changes were indicative of a transition to stability. Variance analysis using a Two-Way approach. The effect of temperature was significant (p<0.0001) and the effect of concentration was also significant (p<0.05) on the stability outcomes using ANOVA. The post-hoc evaluation carried out with Tukey's HSD validated the significant effect of heat stress induced instability compared to the baseline and tropical situations. The regression prediction modeling showed that a 5% concentration at 25°C is the optimum experimental setting for stability and the pH range is kept within the tolerable range. The study shows that pH is a good indicator of the degradation process and that both chemical and bacterial degradation are enhanced with higher temperatures.