IGEM:IMPERIAL/2006/project/Bio elec interface/About
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Range of pH values we are expecting to see from different concentrations of AHL
- Part C0061 produces AHL(N-acyl homoserine lactone), specifically it produces 3-oxohexanoyl-homoserine lactone (3OC6HSL)
- We ordered the following enzyme, a generic acylase: Acylase I from porcine kidney
- The acylase breaks down AHL into fatty acid (carboxylic acid) and HSL: AHL + H20 -> Fatty Acid + HSL
- Since carboxylic acid is a weak acid, we need to find pKa values and calculate H+ concentrations for different concentrations of the acid.
- pKa value found from Harvard University: Evans Group pKa Table: Carboxylic Acid with X=C6H5 -> pKa = 4.2
- Working out the Ka:
- HA(aq) <-> H+ + A-
- Ka = [H+][A-]/[HA]
- pKa = -log(Ka) = 4.2 -> Ka = 10E-4.2
- For [AHL] = 10E-9 M -> [H+] = 9.99*10E-10 M
- For [AHL] = 10E-3 M -> [H+] = 2.216 M
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