Fatima Zohra

9 Questions 3 Answers 0 Followers

Questions related from Fatima Zohra

Why do some people use fractionation (chloroform, ethylacetate and butanol etc) after extraction when crude is obtained to study antioxidant activity?

Why do some people use fractionation ( n-hexan ,chloroform ,ethylacetate and butanol etc) not crude ?. Does fractionation contain phenols alone?

26 February 2018 5,764 4 View

What are the antioxidants compounds found in fruits and plants other than phenolic ?

Hi every one I have a crud methanolic extract, I want to know what antioxidants compounds are in it , they can be sugars and enzymes?

21 January 2018 3,950 13 View

Is the identification of the compounds by HPLC method using standards enough?

Hi everyone Can i identify Peaks of complicated crud extract by congruent retention times compared with standards without using other methods ? Thank you in advance

09 January 2018 5,811 7 View

Is it reasonable the big values of IC 50 (DPPH methode ) of the crude extract ?

values of IC 50 (DPPH methode ) of the crude extract of mature dates Knowing that the DPPH concentration is 0,25 g/l

29 August 2017 7,888 3 View

How can I study the anti-inflammatory activity?

I need to study the anti-inflammatory activity of the crude Mtanolic extracts . What is the method?

26 July 2017 4,418 6 View

Increases of tannins in the dates ?

Increases of tannins in the dates (the final stage of maturity) phase compared to the wet phase(the penultimate stage of maturity).Are these results logical or is there a mistake?Because when I...

06 April 2017 1,209 4 View

Plot of the absorbance fall with respect to the concentration of extracts How is ?

Plot of the absorbance fall with respect to the concentration of extracts Must be a straight line or not ? it can increase and decrease ?

25 March 2017 1,090 2 View

The emergence of violet when I adding Aluminium chloride (AlCl3) to crude extract what it means?

I have added Aluminium chloride (AlCl3) ethanolique to the crude extract of the dates fruit in order to measure the absorption by spectrophotometre .Instead of the emergence of the yellow color...

10 February 2017 5,483 3 View

Phenols and flavonoids in fruits decreases with maturity stages, why?

I found that total phenolic and flavonoids in date fruits decreases with maturity stages, why ? What does become to ?

08 February 2017 9,503 3 View