05 December 2023 1 8K Report

Hi, can someone suggest some research about the negative correlation between DPPH and FRAP values? Is it possible to determine a decrease in DPPH values while FRAP values increase in the same sample?

More Nezahat Olcay's questions See All
Which Taylor expansion terms in the proof of central limit theorem are neglected as N goes to infinity?

My question is about the proof of central limit theorem (CLT) in probability theory. In the proof of CLT (see, for example, Kay, Steven. Intuitive probability and random processes using MATLAB®....

08 May 2024 10,124 0 View

Can anyone help me prepare liquid protein extract for the Biuret Protein Assay from solid samples?

The Biuret protein method uses liquid samples. But how can I obtain a liquid protein extract from solid samples? Can you please share with me some methods or references about it?

22 August 2023 6,379 2 View

How can the amorphous structure be quantified by mass with MAUD?

I analyze the hydration products of cement-based materials in a quantitative way. I can determine crystalline structures quantitatively; however, since amorphous structures do not have a specific...

15 August 2023 9,317 0 View

When to examine knockdown of target after transfection?

I transfected a cell line with plasmids having shRNA inserts. After transfection, when should I examine the knockdown efficiency? I would like to isolate total RNA and do qPCR for that. I would be...

12 July 2021 6,294 3 View

How to isolate RNA from primary neuron culture?

Currently, I have a problem to isolate total RNA from mouse primary cortical neuron culture. I am seeding neurons to poly-L-lysine coated coverslips and seeding 500k cells per coverslips in a...

16 January 2021 4,980 8 View

What is the correction factor of elastic modulus of cylindrical concrete cores when L/d is less than 2 ?

I have some concrete cylindrical cores and their L/d ratios are less than 2. Elastic modulus will be tested on them. However, this test ( EN 12390-3) can be applied when 2

28 August 2019 1,060 3 View

Do you know if there is any international DATABASE regarding recent CULTURAL or ETHNIC DIVERSITY by countries?

Fearon and Alesina et al. analysed these concepts and constructed some indices on these subjects. However, none of the values of the indices are not up to date now. I need more recent data. Thanks...

11 July 2016 613 11 View

Is nonnegative matrix factorization (NMF) truly a blind source separation method?

I have been recently interested in source separation for musical signals. The paper I study (see below), uses nonnegative matrix factorization (NMF) for separation of musical audio recordings...

11 May 2015 9,141 3 View

How is the proof of the theorem of linear transformations of Gaussian multivariate random vectors for non-square matrices?

A well-known theorem in probability states: Let x be an Nx1 Gaussian vector with mean vector m and covariance matrix Cx .If we linearly transform x as y=Px using a square NxN transform matrix P,...

27 April 2015 4,337 6 View

Similar questions and discussions
How can I calculate IC50 in DPPH test by using graph pad prism software?

How can I calculate IC50 in the DPPH test using graph pad prism software? or suggest a manual method and other software to calculate the IC50 value.

06 August 2024 8,848 3 View

Does the gender of plants affect in the level of DPPH?

I have conducted research on the genus Salix, ad my results show that gender has a direct impact on the DPPH. Has anyone else obtained similar results or do you know of any articles that confirm this?

27 July 2024 5,144 1 View

How could I determine antioxidant activity of Capsicum annuum fruits?

I need a detailed protocol of any suitable method for ex., DPPH to determine antioxidant activity.

28 June 2024 3,855 2 View

About the standard of the FRAP in calculation?

Good morning/day/evening salaam I’d like to ask about the FRAP assay again. I have read some articles which represent the data of frap assay as mg trolox equivalent/L, mg ascorbic acid...

27 June 2024 5,239 0 View

Can I dissolve DPPH in THF for antioxidant activity Assay ?

My compounds are soluble In THF, so I woould like to know If for antioxidant activity I can prepare DPPH in THF. Before, I did a test in wich I had DPPH in ethanol, but when I Add my sample in...

17 June 2024 4,183 3 View

Please what should I do if I find a disorder when testing antioxidant activity by DPPH?

I have solubilized DPPH in methanol and used ascorbic acid as a positive control, and am testing the activity of pectins.

05 June 2024 6,197 1 View

How to calculate my FRAP Assay?

Y=0.0011x+0.1031 (Standard curve eq) Chamomile sample 20mg/mL Absorbance(y)= 1.16 x=960.82(µg/mL) Chamomile sample 10mg/mL Absorbance(y)= 0.80 x=633.55(µg/mL) Tridax sample...

01 June 2024 7,843 0 View

Why is it that I keep on obtaining negative and positive %radical scavenging activity (RSA) in DPPH?

As a context, we have been optimizing the DPPH protocol for our seaweed ethanolic extract. We also use varying concentration points from the various methods in published journal articles, yet none...

28 May 2024 3,097 2 View

Why is the solution cloudy during DPPH antioxidant testing?

I'm trying to do a DPPH antioxidant test but when I mixed all the reagents with my polyphenol extract, some of the samples turned cloudy. Why does it happen and how can I prevent it? I am working...

24 April 2024 1,925 5 View

How to overcome the insolubility of chemically synthesised nanoparticles during analysis of DPPH radical scavenging in a multiwell plate?

I have chemically synthesised zinc based nanoparticles and they are insoluble in any solvent including DMSO. I need to carry out antioxidant activity of these nanoparticles but the results of the...

22 April 2024 9,139 0 View

Our partners will collect data and use cookies for ad personalization and measurement. Learn how we and our ad partner Google, collect and use data. Agree & close