Hamza Aliboudhar

3 Questions 2 Answers 0 Followers

Questions related from Hamza Aliboudhar

How can explain a positive absorbance for sample concentration equal to zero?

Hi, If we trace the calibration curve of gallic acid or quercetin, one never obtains a straight line which does not pass through the origin (C = 0 for an absorbance = 0). This absorbance (C = 0)...

04 February 2016 1,454 5 View

Are there an explanation for these results?

Hi. I have a methanolic extract that I have fractioned it following proper protocol. The problem is that the extract gave total polyphenols contents and flavonoids lower than its fractions but a...

04 February 2016 9,652 5 View

Is there an explanation for a negative absorbance of a DPPH solution after addition of the extracts to the solution?

I have a synthetic product and want to test its antioxidant activity. This product is dissolved in DMSO, the problem is that the absorbance of this product increases (antioxidant activity...

11 June 2014 4,939 7 View