Yvonne Shuen Lann Choo

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Questions related from Yvonne Shuen Lann Choo

Any tips and tricks to prevent bubbles from being trapped in polymer film during membrane formation via immersion precipitation?

Steps involved: 1. Dissolving polymer into THF 2. Casting on an FEP sheet support 3. Immersing into water bath I noticed most bubbles formed during casting and immersing into a water bath. Did...

06 July 2017 6,478 6 View

Why does the level of phenobarbital spiked in blood appear to be lower than the actual spiked amount when being screened by ELISA?

5ppb of phenobarbital have been spiked into blank blood. This have been replicated by 10 times. However, ELISA results show that all 10 of the replicates contains LESS than 5ppb (average of...

15 July 2013 1,026 1 View

Will the formation of semicarbazone from an unknown (suspected to be a ketone) be long, or has it been falsely analysed?

In an undergraduate organic experiment, we are required to identify the functional group present via solubility tests (with H2O, HCl, NaOH and NaHCO3) and Classification Tests (Brady's, Tollen's,...

11 March 2013 3,063 6 View