The main purpose of calibrating a fluorescence quantitative PCR instrument is to ensure the accuracy and stability of temperature, time, and fluorescence detection during the PCR reaction process, thereby ensuring the reliability and scientificity of experimental results. It is a key step to ensure the accuracy and reliability of experimental results, which requires systematic operation from three dimensions: hardware performance calibration, optical system calibration, and software parameter verification, combined with daily maintenance and regular calibration strategies to ensure the long-term stability of the instrument.
The specific content and importance of calibration
Temperature calibration: The core of PCR reaction lies in the different characteristics of DNA at different temperatures, so temperature control is an important performance indicator of PCR instruments. Calibration can ensure the stability and accuracy of the instrument at different temperatures, avoiding non-specific amplification or decreased amplification efficiency caused by inaccurate temperature control.
Time control calibration: Accurate time setting can ensure that each stage of PCR reaction is carried out according to the predetermined time, ensuring the efficiency and accuracy of DNA amplification. Calibration of time control can prevent incomplete or excessive amplification caused by inaccurate time settings.
Fluorescence detection system calibration: For fluorescence quantitative PCR instruments, the accuracy of fluorescence detection directly affects the detection results. Calibration can ensure the sensitivity and linear response of fluorescence detection systems, avoiding experimental result deviations caused by system issues.
Verification and recording after calibration
Run verification experiment
Perform amplification experiments using standard samples of known concentration to verify the performance of the calibrated instrument.
Check whether the amplification curve, Ct value, melting curve and other parameters meet expectations.
Record calibration data
Detailed records of calibration date, calibration personnel, calibration results, and adjusted parameters.
Archive the calibration report for future audits or troubleshooting.
Regular resumption of classes
Develop a regular calibration plan (usually every 6 months or 1 year) based on the frequency of instrument use and laboratory requirements.
After repairing or replacing critical components of the instrument, recalibration is required.