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If samples are to be used within 24 hours, aliquot and store at 4 °C. If samples are to be used over a long period of time, aliquot and store between -20 °C and -80 °C, depending on the duration of storage. Note: Samples containing a visible precipitate or pellet must be clarified prior to use in the assay. Caution: Avoid repeated freeze/thaw cycles to prevent loss of biological activity of proteins in experimental samples.
Note: If possible, all incubation steps should be performed on an orbital shaker to equilibrate solutions when added to the microplate wells. Also, all provided solutions should be at ambient temperature prior to use. Note: Avoid adding solutions into wells at an angle, always keep pipette tip perpendicular to plate bottom. Reconstitution of Provided Materials:
Generation of Standard Curve and Interpretation of Data1. Average the duplicate or triplicate readings for each standard, control and sample and subtract the average zero standard optical density.2. Generate a standard curve by using Microsoft Excel or other computer software capable of establishing a 4- Parameter Logistic (4-PL) curve fit. If using Excel or an alternative graphing tool, plot the average optical density values in absorbance units (y-axis) against the known standard concentrations in pg/ml (x-axis). Note: Only use the values in which a noticeable gradient can be established. Afterwards, generate a best fit curve or trend-line through the plotted points via regression analysis.