User:Samiye Yaman/Notebook/Lab 581/2013/03/29

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Contents

Objectives

Description

Part A: Preparing Dilutions for UV-Vis Measurements

  • Centrifuge 6 solutions containing varying amounts of R6G prepared on 03/27/2013 for 5 minutes at 11200rpm 3 times.
  • Prepare stock solutions for comprison (10μL, 15μL, 20μL, 25μL, 30μL and 35μL in 1.5 ml phosphate buffer)
  • UV-Vis measurements of stock solutions and supernatants were taken

Part B: Observing pH changes

  • Separate crystal violet containing hydrogels into two epi-test tubes, labelled as A & B.(app 1mg in each)
  • Add 1mL of 1M HCl to one epi test tube A and 1mL NaOH to epitest tube B.

3) Centrifuge for 2 min at 11200rpm.

4) Take UV-Vis of supernatants

Part C: Prepare hydrogels with further pH analysis

  • 0.5mg samples of PVOH hydrogels containing no lecithin and no dye was added in to 3 seperate epi test tubes with 1.5 mL phosphate buffer.

Data

Notes

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