Sam:LabNotes/Microbiome-new/2011-4-5: Difference between revisions

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>Sam Chiang
>Sam Chiang
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**This is to validate if there is any carry over contamination from TrypenBlue dye (undissolved chemical residues).
**This is to validate if there is any carry over contamination from TrypenBlue dye (undissolved chemical residues).
**I can see some on unidentified spots (similar to E.coli size) which are not moving around. I thought they mabybe just the stains from glass slide. Even I use isopropranol to wash the slide those spots are not removable.
**I can see some on unidentified spots (similar to E.coli size) which are not moving around. I thought they mabybe just the stains from glass slide. Even I use isopropranol to wash the slide those spots are not removable.
==Tested on Tween20 treated slide==
*I also tried to used Tween20 rinsed slide to make the surface more hydrophilic and the sample droplet thinner. Maybe I didn't treat the slide long enough so I didn't see a significant improvement (This method works previously. I should go back to check my old wiki records).
==NEXT==

Revision as of 07:36, 6 April 2011

Single E.coli cell micromanipulation new test on TrypenBlue stained E.coil

Background

  • From previous test on 03-31-11, we learned how to set up some basic conditions for targeting E.colis
    • Use cover slide to keep sample from evaporation.
    • Able to target E.coli cell without any staining.
    • Still can see many debris >= the size of E.coli. Hard to define

Objective

  • Test Trrypen BLue stained E.coli
  • Improve glass slide washing using isopropanol
  • Improve E.coli washing using 0.2um filtered 1XPBS.
  • Make new micro-pipette tips with narrower mouth-open between 10~20um (by Andy)

TrypanBlue(TB) staining

  • Use the same E.coli culture from 03-31-11 test
  • E.coli washing at low-speed (4000 rpm, 5min at RT)with 0.2um filtered clean PBS.
    • Use low speed to avoid the precipitation of cell debris.
  • Resuspend the E.coli cells in 1.5mL PBS -> low-speed pelleting -> Discard supernatant
  • Repeat the last step again.
  • Resuspend in 1.5mL PBS (estimated conc. as 10^9/mL).
  • Prepare two 1.7mL tube labeled as TB(E.coli) and TB(Neg)
  • Transfer 10uL E.coli (10^9/mL) culture into the 1.7mL tube. Transfer 10uL PBS in the TB(Neg.) tube.
  • Add 10uL undiluted TrypenBlue into 1.7mL tubes. Mix by repeat pieptting and incubate at RT for about 10min.
  • Add 980uL 1XPBS (estimated conc. became 10^7/mL)
  • Perform anther 1/100 dilution by adding 2uL stained sample in 198uL PBS (estimated conc. became 10^5/mL)
    • since I use low-speed washing in the first step, I lost more E.coli during washing so I start with 10^5/mL for micromanipulation.

Results

  • E.coli cells look like black spots no matter is a TrypenBlue stained or not. In a diluted sample. since we are not using eye piece to observe and manipulate. The camera is monochrome so the TB stained E.coli look the same as non-stained E.coli cell.
    • There is no significant improvement using TrypenBlue staining (Or I didn' stain E.coli cell in the right way?)
  • TB-stained negative control.
    • This is to validate if there is any carry over contamination from TrypenBlue dye (undissolved chemical residues).
    • I can see some on unidentified spots (similar to E.coli size) which are not moving around. I thought they mabybe just the stains from glass slide. Even I use isopropranol to wash the slide those spots are not removable.

Tested on Tween20 treated slide

  • I also tried to used Tween20 rinsed slide to make the surface more hydrophilic and the sample droplet thinner. Maybe I didn't treat the slide long enough so I didn't see a significant improvement (This method works previously. I should go back to check my old wiki records).

NEXT