User:Madeleine Y. Bee/Notebook/Single Molecule Fluorescence/2013/06/10

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June 10, 2013

  • Silica-coating procedure from 05/24/2013 performed
    • MHA attachment performed, silica-coating reaction to be performed tomorrow

Buffer Preparation and Calculations

Sodium phosphate buffer, pH 9, to be used for the modification of HS-DNA and AuNPs@SiO2 procedure.
monosodium phosphate- MW: 119.98g/mol
disodium phosphate- MW: 141.96g/mol, pKA: 6.82
buffer- pH 9,concentration 10mM


Use 0.0094g NaH2PO4 and 1.19188g Na2HPO4 in 1L water.

New: Modifying Silica-Coated AuNPs with HS-DNA Procedure

  • Combine 150μL AuNPs@SiO2, 15μL APS and 235μL ethanol
  • Vortex solution for 30 minutes
  • Rinse sample three times by centrifugation at 7700g with ethanol and two times with sodium phosphate buffer, pH 9 (SPB)
  • Make a separate solution of 1 mg sulfo-SMCC in 400μL of SPB
  • Add SSMCC solution to AuNP solution
  • Vortex for 1 hour
  • Rinse twice with SPB
  • Rinse twice with potassium phosphate buffer, pH 7.4 (KPB)
  • Combine sample with 50μL 20μM HS-DNA
  • Vortex for 1 hour
  • Rinse three times with KPB
  • Re-suspend in 150μL KPB

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