Respected Sir,

Presence of phenolic compounds such as flavonoids, phenolic acids, diterpenes and tannins in large amount are mainly responsible for the potent antioxidant activity of any plant extract. So I think that there may be no possibility in decrease of flavonoids. If my answer helps you, please do vote for my answer and encourage me.

With regards,

Dr. Tresina

Respected Sir,

Presence of phenolic compounds such as flavonoids, phenolic acids, diterpenes and tannins in large amount are mainly responsible for the potent antioxidant activity of any plant extract. So I think that there may be no possibility in decrease of flavonoids. If my answer helps you, please do vote for my answer and encourage me.

With regards,

Dr. Tresina

thanks Dr. Tresina Soris P for answering but i want to know is there any correlation or necessary to increase all constituents in particular stress condition.

Dear Sir,

The question is not clear to me. I have some queries:

Firstly is your phenol content more than flavoniod for your sample. If so it is not at all a problem.

Secondly you told that the phenol content and antioxidant activity are high while flavonoid is decreased. Here I want to know whether you are doing the quantification with respect to concentartion and you mean to say that with increase in conc. your Phenol content and antioxidant activity increases while flavonoid decreases.

Hope you I am clear with my queries. Seeking a response from your side so that I can possibly help you in tis regard.

Regards

Arvind

Antioxidant potency of a plant extract depends on the total polyphenol content including phenolic acids, tannins, flavonoids and others as well as Vitamin A, C, and E and some other secondary chemicals. Hence, it is quite possible that flavonoids content may decrease even with increase in the total phenol and antioxidant property of the plants.

thanks for ur concern Arvind Kumar Goyal.....ya during quantification conc of flavanoids dec. whereas phenols and antioxidant con. increases .....so it there any correlation or mechanism behind this to depict conclusion

Yes, there is positive coorelation between polyphenol content vis-a-vis antioxidant . However the relative concentration of different class of phenolic constituents may vary.

I agree with Dr. Yogesh Chandra Tripathi. Flavonoids, such as anthocyanins for e.g. may decrease , while total antioxidant activity and phenol content in leaves may be high

It means there is no particular trend...any of bio-active component alters its expression level according to prevailing environmental conditions...