Mohamad Shazeli Che Zain

12 Questions 9 Answers 0 Followers

Questions related from Mohamad Shazeli Che Zain

Why my natural deep eutectic solvent (NaDES) does not form homogeneous liquid with low water content?

I am optimizing the method of developing natural deep eutectic solvent by using different methods, molar ratio and water content. For heating and stirring method, I used 1:1 Choline chloride:1,2...

05 August 2019 4,080 3 View

How do I dissolve water in oil (w/o) nanoemulsion in water?

I did quick preliminary solubility study on my flavonoid enriched extract in oil and water phase. I found my extract is more soluble in water. Prior this study, I thought my extract is oil soluble...

18 July 2019 5,305 3 View

What are the companies producing active compounds i.e. flavonoids?

With regard to the question above, may I know any good companies are extracting, enriching or isolating natural active compounds i.e.flavonoids for pharmaceutical, nutraceutical or cosmaceutical...

09 May 2019 7,150 1 View

What are the reasons that may cause for the decrease of flavonoid C-glyosides after acid hydrolysis?

I am currently treating my crude extract with acid to obtain flavonoid C-glycoside. The conditions that I used for acid hydrolysis was the dried crude extract was reconstituted with 1 mL of water....

03 December 2018 5,000 2 View

What is the acceptable range for root mean square error of estimation (RMSEE) and root mean square error of cross validation (RMSECV)?

I am currently analyzing data for metabolomics studies (PLS). I am using SIMCA to analyse my result. I came across with RMSEE and RMSECV. May I know what are the acceptable range for these two...

24 October 2018 2,660 3 View

How to decide the optimum initial concentration for adsorption studies of flavanoids using macroporous resins?

I had carried out the batch experiment using different types of resins on adsorption of flavanoids at different initial concentrations. Based on the results I found that when I decreased the...

02 September 2018 3,878 5 View

Can Response Surface Methodology (RSM) be used after the optimization work already done?

I plan to analyze the optimization results using RSM. However, I wonder can my present data be used in RSM. Previously, I optimized my extraction conditions individually. For example, to get...

06 April 2018 8,294 3 View

The maximum wavelength of Quercetin is 415 nm or 510 nm?

I am currently conducting experiment on determination of total flavonoid content by using Quercetin as standard. After reading few literature, I found out some researchers used 415 nm and some...

04 February 2018 1,441 5 View

What if the absorbance value of plant extract is higher than the range of calibration curve?

I am currently doing research on total flavonoid content. I use Quercetin as standard for my calibration curve. The regression coefficient is 0.99. I use different solvent extracts as my samples....

31 January 2018 9,440 9 View

What is the optimum temperature for flavanoid plant extraction using sonication technique?

I am currently optimizing the temperature for my plant extraction. My interest is to extract optimum flavanoid using sonication technique. Currently I am setting the temperature at room...

13 November 2017 4,127 7 View

How can I prepare 1 mL of 12N concentrated hydrochloric acid for acid hydrolysis?

The info I obtained from one journal article that I read for acid hydrolysis. Unfortunately the author does not include the molarity used for concentrated hydrochloric acid. The only info I got...

30 October 2017 7,414 3 View

How do I dry the plant powder? and Does it affect the extraction if the powders are not totally dried?

I realized my plant powders are not totally dried after grinding. I already left the plant samples in the oven for four days before grinding into powders.

16 October 2017 6,670 2 View