Dear Andrey Massarsky thanks so much for your answer according to the link you provide AgNPs has antioxidant activity but synergistic effect with the extract is higher. this means decrease of absorbance must be recorded but in less extent than synergistic.

great dear Andrey Massarsky that's the result of the researcher but many AgNPs interested researchers agreed that AgNPs express antioxidant activity and the activity is correlated to the size and shape of the NPs.

the cor of my question about the result that the test absorbance spectrum increase over the control there question mark , (what is the source of the increasing absorbance?)

please I'll be thankful your assistance in sending me a detailed H2O2 degradation method pdf.

thanks a lot

I appreciate your response Dr. Andrey Massarsky