i partitioned an ethanolic extract of a plant that gave a positive indication for alkaloids in VLC using Silica gel HF254 with solvent systems Hex, DCM, Ethyl acetate and methanol.
You can check the present of alkaloids in each fraction by TLC and spray with specific reagents for alkaloid (ex. Dragendorf)
I prepared the FRAP reagent using a 10:1:1 ratio of 300 mM acetate buffer (pH 3.6), 10 mM TPTZ and 10 mM FeCl3.6H2O. Why is there a need to incubate the said solution at 37 degrees before adding...
01 February 2020 1,703 1 View
Hello, I was wondering if you already have an experience in handling Diaion HP20, I would like to know if how big is the column size and the height that you use. And also if what solvent system do...
01 February 2016 5,989 0 View
Hi, i would like to ask if someone here has been able to use Diaion HP20 in their isolation. How is it packed (size of the column, height of the diaion hp20 in the column, and ID of the column)?...
06 July 2014 3,625 4 View
If I will conduct an assay in a microplate, which concentration of the test sample shall I follow? the indicated prepared concentration or the concentration together with the other additives (fluids)?
03 April 2013 786 6 View
Hi, I have problems with running gel electrophoresis. I have tried agarose gel electrophoresis and native PAGE. I have two proteins, which have molecular weights of ~30kDa and ~180kDa and two...
03 March 2021 4,275 4 View
Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru
02 March 2021 1,787 2 View
Gel electrophoresis, RNA degradation, RNA extraction from fresh tissue
02 March 2021 5,433 5 View
I have an input video, of skin (from a microscope that means it is magnified such that blood capillaries are visible). The idea is to extract 15 sec of continuous frames from a video of 1 min,...
02 March 2021 2,735 2 View
I am searching for a good place for the Post Doc,
02 March 2021 4,053 3 View
I'd like to perform single-strand conformation polymorphism (SSCP) in my thesis, however I cannot control the temperature of the vertical PAGE since we are using the conventional tanks. Is there a...
02 March 2021 9,157 1 View
I need a procedure to extract the ciprofloxacin hydrochloride from aqueous solution by using dichloromethane in detail,. I thank you very much.
01 March 2021 4,306 1 View
Can someone please give me some possible things that could go wrong? Here is my recipe: 0.5g Agarose 50 mL of TAE 1x 1 uL ethyl bromide. Gel was run at 100V for 1 hour. The buffer used is also TAE.
01 March 2021 9,952 3 View
I want to find a quorum sensing inhibitor from plant extracts. Klebsiella pneumoniae, Moraxella catarrhalis, Staphylococcus aureus, and Streptococcus pneumoniae. I looked for these strains...
01 March 2021 7,675 3 View
Dear Dr. Cai, my name is Simone Prospero and I work in the team of Phytopathology at the Swiss Federal Institute for Forest Snow and Landscape Research (WSL;...
01 March 2021 1,133 1 View