Research On The Lateral Flow Immunoassay Of Clenbuterol Detection Based On Single/Double Signal Amplification Strategy

Common “meat powder” in foods include Salbutamol(SAL),Clenbuterol hydrochloride(CLE),and Ractopamine(RAC).Its main component is a β-adrenoceptor agonist.Because it can improve fat distribution and increase the proportion of lean meat,it is illegally added to farm feed by bad businesses to obtain higher economic benefits.“Meat powder” may accumulate in the body easily and is stable at high temperatures,making a major hazard to people’s health and causing food poisoning.Despite the fact that countries all over the world have implemented stringent control mechanisms regarding the food safety issues of clenbuterol,these incidents nonetheless occasionally occur.Due to its benefits of speed,mobility,high specificity,and low economic cost,lateral flow immunoassay(LFIA)is frequently utilized as a real-time field analysis approach.However,the development of LFIA is constrained by the market demand for highly sensitive and quick detection,and traditional strip technology primarily depends on the output of a single colorimetric signal.As a result,there is an urgent need to innovate and further optimize the detection methods.To increase the sensitivity of test strip detection,this study focused on this fault from two angles,and these two methods were further applied to the detection of SAL and CLE in foods.The following are the primary research findings:1.The construction,performance determination and actual detection of single signal LFIA: Cu S-NS hollow nanospheres were produced using a hydrothermal process and employed as signal labels.For the quick detection of SAL in food,an LFIA was developed.To increase sensitivity,the colorimetric signal was amplified by in situ gold growth.By using galvanic replacement,it is possible to grow gold in place without a reducing agent while also avoiding the drawbacks such as fresh reinforcing solution and the high background interference brought on by reducing agents.The visual detection limits(v LOD)before/after enhancement and individual Cu S were 2.00 ng/m L,2.00 ng/m L,and 5.00ng/m L,respectively,and the detection cutoff values(cut-off)were 8.00 ng/m L,20.00ng/m L,and 40.00 ng/m L,respectively,according to the performance evaluation results after a series of optimizations.The calculated sensitivity(c LOD)was 0.138 ng/m L under enhanced effect and 0.497 ng/m L for Cu S alone.The constructed single signal LFIA based on in-situ metal grown had relatively sensitive detection performance for the detection of SAL while maintaining the recognition of naked eye signal.The methods used pork and beef as actual samples to evaluate the anti-food matrix interference ability,depending on the types of foods in which SAL is commonly added.The v LOD and cut-off values of the methods are similar to those of the performance mode.For the improved single-signal method,the recoveries of pork and beef samples were 83.11 % to 120.95 % and 88.04 % to102.93 % respectively.These results indicated that the methods maintained good applicability in the actual detection of SAL in food2.The construction,performance determination and actual detection of photothermal and colorimetric double signal LFIA: Cuttlefish ink is a food waste.CINPs can be made by washing,centrifuging,and drying cuttlefish ink naturally,without the use of artificial synthesis or labor-intensive processing.Through photothermal-concentration investigation,photothermal cycle experiment,and photothermal performance analysis,the secondary signal capability was investigated.As a result,CINPs had a 30.24 % photothermal conversion efficiency.The test strip underwent a number of adjustments,and CLE was evaluated by colorimetric and photothermal dual signal output under the ideal test circumstances.According to the findings of performance evaluation,the cut-off value for colorimetric and photothermal signals was 7.00 ng/m L,and the v LOD for both was 1.00ng/m L.A thorough computation of the c LOD revealed that the c LOD in the colorimetric signal mode was 0.179 ng/m L and the photothermal signal mode was 0.076 ng/m L.The outcomes demonstrated that the photothermal colorimetric dual-signal LFIA using CINPs could realize dual-signal output and maintain relatively sensitive detection performance.Similarly,the methods used pork and beef as actual samples to evaluate the anti-food matrix interference ability,depending on the types of foods in which CLE is commonly added.For the dual-signal method,the recoveries of pork and beef samples were 91.94 %to 104.65 % and 88.38 % to 103.50 %,respectively.These results indicated that the methods maintained good applicability in the actual detection of CLE in food,and could be used for the actual control and determination of hazard factors in food.