18 Questions 12 Answers 0 Followers
Questions related from Shazeli Zain
I am having difficulty to get polyglycerol polyricinoleate (PGPR) as surfactant in emulsion formulation. Currently, I am having problem in getting stable double nanoemulsion. I read most journals...
08 August 2019 793 1 View
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...
07 July 2019 949 4 View
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...
05 May 2019 4,898 1 View
Hi. I would like to use this platform to ask question regarding the alternative dyes which can be used for solvent polarity testing. So far I came across Nile red (NR) which commonly used for...
05 May 2019 7,438 2 View
I am currently developing natural deep eutectic solvents (NADES) for flavonoid extraction from my plant sample. However, I am having the difficulty to evaporate off the developed NADES in order to...
04 April 2019 3,811 5 View
Currently, I am conducting research on the adsorption and desorption of flavonoids in plant extract by using macroporous resins. After equilibrium, the adsorbed flavonoids by resins were treated...
10 October 2018 1,972 7 View
I am currently conducting dynamic adsorption and desoprtion studies on flavonoids by using macroporous resins. I am having difficulty to understand at what point should I consider the resins...
08 August 2018 5,980 2 View
I am having difficulty to separate very close peaks which are isomers. Currently I am using Xbridge Waters C18 column (4.5 mm, 150 mm and 5 micrometer). I used solvent A as water (0.1% acetic...
07 July 2018 3,121 4 View
I carried out TFC determination using NaNO2-AlCl3-NaOH assay in 96 well plates. However, after repeating a few times using the same methods and volume the result is inconsistent. I realised the...
04 April 2018 5,007 0 View
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...
04 April 2018 405 3 View
I am doing research on FRAP (TPTZ reagent method) for antioxidant activity. I know the preferred wavelength is 593nm. Is it possible to measure at 570nm instead as for now the 593nm filter not...
03 March 2018 1,685 3 View
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....
01 January 2018 5,424 9 View
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...
11 November 2017 4,743 8 View
Well journal suggest to use nitrogen stream to evaporate off HCl. However, we don't have it. I tried to use rotavap after few hours its still not evaporating off. Mind to suggest methods to...
11 November 2017 5,639 4 View
I would like to run my extract for LCMS. The solvent ratios that I suppose to use according to the journal that I follow are A= water:0.1% acetic acid and B= acetonitrile:0.125% acetic acid....
11 November 2017 4,195 6 View
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.
10 October 2017 4,174 3 View
Well currently I am doing research on plant extraction. The plant powder has to be dissolved in different solvents such as Hexane, EA, mixture of EA-CH3OH and methanol at ratio 1:50. My issue is...
10 October 2017 7,489 2 View
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...
10 October 2017 6,295 2 View
