There is no fixed standard for the issuance time of the detection results of the food safety comprehensive analyzer, which mainly depends on the type of detection item, detection method, instrument performance, and the complexity of sample pretreatment. The difference can range from a few minutes to several hours. The following are specific classification instructions:
1、 Divided by type of testing items (core influencing factors)
The detection principles and processes for different pollutants vary greatly, directly determining the time required
Category of testing itemsCommon detection indicatorsDetection time consumptionCore reasons
Quick screening projectPesticide residues (organophosphorus, carbamate), veterinary drug residues (clenbuterol), nitrite, heavy metals (rapid method)3-30 minutesRapid techniques such as immunochromatography and colorimetry are commonly used, and sample pretreatment is simple (such as simple extraction and dropwise addition). The instrument directly reads the reaction signal without the need for complex separation.
Conventional quantitative itemsMulti component pesticide residues, mycotoxins (B1), pathogenic bacteria (Salmonella)1-4 hoursBasic sample pretreatment (such as homogenization, centrifugation, purification) is required, using enzyme-linked immunosorbent assay (ELISA), colloidal gold enhancement method, etc. The instrument needs to complete reaction incubation, signal detection, and calculation.
Complex Confirmation ProjectUnknown pollutants, trace harmful ingredients (such as plasticizers)4-8 hours+Precision sample pretreatment is required (such as solid-phase extraction SPE, gas chromatography-mass spectrometry pretreatment), and some require the combination of chromatography-mass spectrometry technology (instrument heating, separation, scanning), making the process more complicated.
2、 Other influencing factors
Sample pre-processing complexity
Liquid samples (such as beverages, soy sauce): simple pre-treatment (filtration, dilution is sufficient), short time consumption;
Solid samples (such as meat, grains, fruits and vegetables) require homogenization, precipitation of proteins, and purification of impurities, which increases the time required (usually 10-30 minutes more than liquid samples).
Instrument automation level
Fully automatic food safety comprehensive analyzer: can automatically complete sample addition, incubation, detection, and data export, reducing time by 30% -50% compared to manual operation;
Semi automatic instrument: requires manual sample pretreatment and addition, resulting in longer overall time consumption.
Testing batch quantity
Single sample detection: can quickly produce results;
Batch samples (such as testing 20-48 samples at the same time): waiting for the instrument to complete the entire batch reaction cycle will increase the total time, but the average time per unit sample will decrease.
3、 Summary
Quick screening scenarios (such as farmers' markets and on-site law enforcement): usually takes 3-30 minutes to meet the need for instant judgment;
Routine laboratory testing (such as enterprise self inspection and third-party testing): 1-4 hours for routine projects and more than 4 hours for complex projects;
The specific time consumption needs to be comprehensively judged based on the "detection indicators+sample type+instrument model". The instrument manual or testing institution usually provides the standard time consumption for the corresponding project.