With the unique advantages of high sensitivity, equipment independence, and rapid procedure, loop-mediated isothermal amplification (LAMP) has been extensively developed to detecting various pathogens. The substances of enzyme, dNTP, and other complex organic molecules in LAMP mixture are subjected to a variety of chemical changes under room temperature, many of which are quite unacceptable in terms of storage and transportation. In order to solve this problem, we tried to develop a lyophilization technology for the protection of the LAMP mixture-with the addition of trehalose as a stabilizer. The predictive effects of freeze-drying and different-concentrations of trehalose (5%, 10% and 15%) in LAMP mixture during storage under temperature of 4℃ , 25℃ and 37℃ on amplification activity of LAMP were analyzed systematically. The non-freeze-dried reagents without trehalose were also stored at the same temperature as controls. Our results showed that the lyophilizing LAMP reagents with 15% trehalose exhibited the greatest performance. Furthermore, at 4 ℃ , the half-life of freeze-dried mixtures with 15% trehalose (w/v) was 112. 3d, which was 6. 5-fold of the control. At the temperature of 25 ℃ , the half-life of treated reagents was 36. 2d, which was 8. 7-fold higher than control. Even under the temperature of 37 ℃ , the half-life was 6. 2d, which was 2-fold of the control. We report here the cost effective, simple developing procedure of a freeze-drying LAMP reagent which will promote the widespread use of LAMP in the field.%环介导等温扩增(LAMP)技术近年来被广泛应用于病原生物的检测.为了解决LAMP反应试剂混合物在室温条件下的储运问题,本研究对添加5％、10％和15％海藻糖(质量/体积,g/ml)的LAMP反应试剂混合物进行冷冻干燥处理,研究了其在4℃、25℃和37℃储藏条件下活性维持的情况.研究结果表明,添加15％海藻糖能最大程度地保护LAMP反应试剂混合物的活性.相对于未经处理的普通LAMP体系混合物而言,添加15％海藻糖并经冷冻干燥的试剂混合物在4℃、25℃和37℃储藏条件下的活性半衰期分别为112.3、36.2和6.2d,分别为对照组的6.5、8.7和2,1倍.在LAMP反应试剂混合物中添加海藻糖并进行冷冻干燥处理成本不高、方法简单,将有助于推动LAMP方法在各领域的大规模推广应用.
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