Acylation of polyphenols

More Imen Laib's questions See All

How estimate the standard deviation or the geometric standard deviation from this database.. i have only the geometric mean.?

I need help

11 June 2024 1,279 0 View

Why I see this massive band in my CO-IP?

I am new to CO-IP. I am following this protocol for CO-IP Lysis buffer 1 0,25ml 1M Tris-Cl 0,15ml 5M NaCl 0,5ml 10% NP40 0,25ml 10% Nadeoxycholate MQ 3,85ml 1/2 pill EDTA free Lysis buffer 2...

05 March 2024 6,785 5 View

Compare two pooled prevalence?

When I have two pooled prevalence from different studies. For example, one of the event 1 in x disease, and the second of the same event in the control group, but the study of the prevalence of x...

05 January 2024 4,934 2 View

What 's the VBA function used to change the number of transporters ""number of units" in an ARENA model ?

Hello! I developed a simulation model in ARENA with many forklifts. I would like to change the number of transporters each time without accessing the "transporter" module. For that, I need to add...

25 February 2023 7,755 2 View

How to simulate Six-junction solar cell in SILVACO TCAD?

tandem.txt contains the code am using right now to reach 37.9% efficiency and found a recent research that reached 47% efficiency using 6 junction so how can i try to reach it too using silvaco...

15 May 2022 9,302 0 View

Using Arena simulation software, how can I Request a forklift in advance?

Hello, I want to call a forklift before the batch will be fully manufactured, which module should I use?

28 March 2022 4,257 4 View

What are the applications of bowtie antenna ?

Hello everyone , I want to know what are the applications of bowtie antenna ? Do you have an example of Bowtie antenna application at 28 GHZ. ? Thank you

21 October 2021 947 8 View

What alternative for ANOVA test when levene test shows a violation of the homogeneity assumption?

I am running some statistical analysis for a small size group (4 treatments with 3 replicas for each treatment ). This means that I have 3 independent observations per group, so 12 independent...

10 October 2021 313 18 View

Why from 50 uM of ascorbic acid the percentage of inhibition decreases?

Hello friends I evaluated the anti-free radical activity DPPH of ascorbic acid I repeated it several times I obtained the same results I did not understand why from 50 uM the obtained density...

04 September 2021 8,153 4 View

Microncapsulation of polyphenols in yeast cells?

How is yeast being used in encapsulation of polyphenols? Plasmolysed or intact cells?

22 July 2021 5,390 4 View

Why do I have an increasing concentration for increasing dilutions on spectroscopy even though they should all be the same final concentration?

Hello. We have a sample with an unknown concentration of polyphenols. We're diluting the sample in order to perform the Folin Ciocalteau method. 0.2 grams sample / 4 mL 70% methanol and 30%...

10 June 2024 2,134 3 View

How to calculate the total phenolic contents (TPC) in plant extract sample?

How do I calculate the total polyphenol content in mg GAE/g. from the extract? Following is my data: Sample extract(stock): 0.01 gram in 1 ml Equation: y= 0.0078x - 0.0679, R2 =...

27 May 2024 1,911 2 View

How to analyze the percentages of covalently-bound and noncovalently-bound polyphenols during protein extraction?

I extracted protein from a roasted food sample using alkaline extraction followed by acid precipitation. Polyphenols were always coextracted since they were covalently bound with proteins during...

01 May 2024 7,192 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 remove covalently-bound polyphenols and purify proteins?

I am trying to purify protein extracts but polyphenols are covalently bound with proteins during roasting. Is there any method to remove covalently-bound polyphenols and purify proteins? Thank you!

20 April 2024 285 1 View

About the quantification of polyphenols after LC-MS analysis?

Is it necessary to quantify each standard with its specific compound, or can I use a single standard to quantify two different compounds with the same chemical structure, for example?

14 March 2024 4,960 2 View

Entrapment of polyphenol in chitosan nanoparticle?

I'm currently doing on entrapment of polyphenol in chitosan nanoparticles. I don't understand regarding the encapsulation efficiency of total polyphenol. In my study, I'm calculating total...

02 January 2024 3,572 0 View

Hi, I am Dr. Ananya Ghosh and I am working on residue analysis in tea, I would like to know a method for the analysis of Dithiocarbamate pesticides?

I am using Agilent 7000 series GC-MS/MS for the analysis of DTC pesticides such as Mancozeb and Zineb but the LOQ cannot be lowered up to 10 mg/Kg as there is matrix interference from the tea...

07 December 2023 4,792 1 View

How can I eliminate the proteins in the dates seeds in NADES?

Hi, my name is Anna. I am working on the extraction of polyphenols and carotenoids from date seeds using NADES. I am centrifuging the samples at 14400 rpm-20min-10ºC but when I remove the...

25 November 2023 2,106 1 View

Can we identify polyphenolic compound in honey without purchasing standards HPLC?

I am trying to analyse the polyphenolic or flavonoid content of my honey sample. Can I do it with some new method that doesn't require purchasing any standard for chemical compounds?

23 October 2023 3,241 6 View