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Why must mineral oil be used with our PCR machine?

Why must mineral oil be used with our PCR machine?

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Mineral oil is used when the PCR machine does not have a heated lid. Mineral oil serves to prevent the evaporation of liquid and the change in composition of salts and buffer due to evaporation and condensation which might affect the enzyme activity. In order to prevent changes in the volume of the reaction mixture in the absence of a heated lid, mineral oil is used.

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