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hitechino@163.com
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18519736169
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Qingdao Haitai Yinuo Technology Co., Ltd
Common troubleshooting of free amino acid analyzer: abnormal peak shape, low recovery rate, and troubleshooting techniques for instrument malfunctions
Date: 2025-10-21Read: 1
Free amino acid analyzer is a precision instrument used to detect the content of free amino acids in biological samples, widely used in fields such as food, medicine, and agriculture. However, during use, some common issues may arise, such as abnormal peak shapes, low recovery rates, and instrument malfunctions. If these issues are not resolved in a timely manner, they may affect the accuracy and reliability of the test results. This article will provide a detailed introduction to the troubleshooting and problem-solving techniques for these issues.
1、 Abnormal peak shape
Abnormal peak shape refers to the appearance of peaks in a chromatogram that do not conform to expectations, such as tailing, protrusion, overlap, etc. These issues may be caused by improper sample handling, chromatographic column problems, or instrument settings errors.
Check sample processing
Sample purity: Ensure high sample purity and no impurities. Impurities may interfere with detection, leading to abnormal peak shapes. If the sample contains impurities, it is recommended to undergo further purification treatment.
Sample concentration: Ensure that the sample concentration is moderate. Excessive or insufficient concentration may affect peak shape. If the concentration is too high, the sample can be diluted appropriately; If the concentration is too low, the sample size can be increased.
Check the status of the chromatographic column
Aging of chromatographic columns: Prolonged use or improper operation of chromatographic columns may lead to a decrease in column efficiency and affect peak shape. It is recommended to regularly replace the chromatography column or perform column efficiency recovery treatment.
Column equilibrium: Ensure that the chromatography column is fully equilibrated before use. The balancing process can reduce baseline drift and peak shape anomalies. If the chromatographic column is not fully equilibrated, the equilibration time can be extended or the equilibration conditions can be adjusted.
Check instrument settings
Mobile phase flow rate: Ensure that the mobile phase flow rate is set correctly. Both too fast and too slow flow rates may affect peak shape. Adjust the flow rate to the appropriate range according to the requirements of the chromatographic column.
Detector sensitivity: Ensure that the detector sensitivity is set appropriately. Sensitivity that is too high or too low may affect peak shape. Adjust the sensitivity of the detector according to the sample concentration and detection requirements.
2、 Low recycling rate
Low recovery rate refers to the detection of free amino acid content lower than the actual content, which may be caused by improper sample processing, inaccurate instrument calibration, or operational errors.
Check sample processing
Extraction method: Ensure that the sample extraction method is correct. Improper extraction methods may result in incomplete extraction of some amino acids, affecting the recovery rate. Select the appropriate extraction method based on the sample type.
Extraction efficiency: Ensure high extraction efficiency. Extraction efficiency can be improved by increasing extraction time or optimizing extraction conditions.
Check instrument calibration
Calibration curve: Ensure the accuracy of the calibration curve. Inaccurate calibration curves may lead to deviations in detection results. Regularly use standard samples for calibration to ensure the accuracy of the calibration curve.
Calibration frequency: Regularly calibrate the instrument based on its usage frequency and environmental conditions. Calibration frequency is usually recommended once a month, and if the frequency is high, the number of calibrations can be increased appropriately.
Check for operational errors
Operation steps: Ensure that the operation steps are correct. Improper operation may result in sample loss or detection errors. Strictly follow the operating instructions of the instrument to avoid operational errors.
Repetitive testing: Conduct repetitive testing to ensure the reliability of the results. If there is a significant difference in the results of repetitive testing, the operating procedures and instrument status should be checked.
3、 Instrument malfunction
Instrument malfunction refers to hardware or software problems that occur during the operation of an instrument, such as detector failure, pump failure, or software errors. If these issues are not resolved in a timely manner, they may affect the normal operation of the instrument.
Check the status of the detector
Detector lamp: Ensure that the detector lamp is working properly. Aging or damage to the detector light may lead to a decrease in detection sensitivity. Regularly replace the detector lights to ensure their proper functioning.
Detector contamination: Ensure that the detector is free of contamination. Detector contamination may lead to baseline drift or decreased sensitivity. Regularly clean the detector to ensure that its surface is free of contaminants.
Check the pump status
Pump pressure: Ensure that the pump pressure is normal. Abnormal pump pressure may lead to unstable flow rate of the mobile phase, affecting the detection results. Check the pressure setting and actual pressure of the pump to ensure it is within the normal range.
Pump sealing: Ensure good pump sealing. Poor pump sealing may lead to leakage or unstable flow rate. Regularly inspect the seals of the pump and replace damaged seals in a timely manner.
Check software status
Software update: Ensure that the instrument software is at the latest version. Software updates can fix known issues and improve instrument performance. Regularly check software versions and update them in a timely manner.
Software error: If the software encounters an error, you can try restarting the instrument or restoring the factory settings. If the problem is still unresolved, it is recommended to contact the technical support team for further inspection and repair.
4、 Conclusion
The free amino acid analyzer plays an important role in the field of biological analysis, but problems such as abnormal peak shape, low recovery rate, and instrument failure may be encountered during use. By regularly checking sample processing, instrument settings, and equipment status, these issues can be effectively addressed to ensure the accuracy and reliability of test results. I hope the introduction in this article can help you better use and maintain the free amino acid analyzer, improve testing efficiency and equipment lifespan.