太阳光模拟器的用于光毒性实验
紫外线是与人体皮肤密切相关的一种重要的环境因素,根据波长不同,紫外线可分为长波紫外线(UVA,320-400nm)、中波紫外线(UVB,280-320nm)和短波紫外线(UVC,200-280nm)。能够到达地球表面的紫外线仅包括UVA和UVB,与UVA相比,同等剂量的UVB对皮肤的损伤强度是UVA的1000倍左右。紫外线照射皮肤细胞产生大量活性氧自由基,这些活性氧自由基与引起细胞凋亡密不可分。
实验流程操作注意事项:
新的金属卤化物紫外线灯管应在使用前点亮约100小时,以获得稳定的辐照强度。
根据Hoenle博士的说法,紫外线灯管的寿命时间(光谱稳定)至少为800小时。因此,建议记录太阳光模拟器的使用时间。只有在测试发射的紫外线辐照强度满足的情况下,才允许延长使用。
1、将配备H1滤光片的SOL 500/SOL 3太阳光模拟器安装在适当的稳定支架上,以便微调照射距离。
2、将SOL 500/SOL 3太阳光模拟器调节到辐照距离约60厘米左右。
3、打开太阳光模拟器开关,等待至少15分钟,使用经过校准的UVA紫外辐射计测量通过细胞培养板盖的紫外线辐照度。
4、调整SOL 500/SOL 3太阳光模拟器的距离,使UVA辐照度达到1.7 mW/cm²(每10分钟辐照时间产生的剂量为1 J/cm²)
5、根据同时辐照的板数,检查辐照区域辐照度分布是否均匀:可接受1.6-1.8 mW/cm2的范围。
重要提示:如果在达到半个辐照时间(30分钟)后(如chess Castleing),改变低辐照度和高辐照度板的位置,则可接受1.5和1.9 mW/cm2的大差值。
每次进行光毒性试验前,应按照前面步骤检查SOL 500/SOL 3太阳光模拟器的辐照值。如果使用UV辐射计进行的测量结果低于规定值,则紫外线灯管可能已达到其寿命,或者辐射计由于各种原因造成测量偏差。在这种情况下,应使用第二台相同类型和校准过的紫外辐射计进行交叉检查,该参考辐射计未每天进行处理,且应保持在黑暗中。
德国Dr. Hoenle AG好乐集团成立于1976年,总公司为HONLE GROUP,是先进的紫外工业的供应商之一。作为紫外专家,开发,制造和分销各地的紫外线系统,紫外线灯和紫外线测量设备。这套系统被用在交叉反应活性物质,表灭shajun以及太阳模拟。HONLE(HOENLE)产品在电子、微电子、精密工程和光学工业生产过程中使用,在印刷,汽车,航空和医药等领域的也有广泛应用。
Calibration of the Solar Simulator
Note: New metal halide burners should be burned for ~100 hrs prior to first use to achieve a stable emittance.
According to Dr Hoenle the burner has a shelflife (in which the spectrum is stable) of at least 800 hrs. Recording of lamp usage hours is, therefore, recommended. Extended use is only acceptable if the emitted energy spectrum can be checked.
1. Mount the SOL 500 / SOL 3 lamp, equipped with a H1-filter, on any appropriate stable tripod allowing fine-adjustment of the exposure distance.
2. Adjust SOL 500 / SOL 3 to a distance of about 60 cm.
3. Switch the Lamp on, wait at least 15 minutes and measure irradiance through the lid of a cell culture plate using the calibrated UV radiometer (type 37, Dr. Hönle), equipped with an UVA-sensor of the same serial number
.
4. Adjust distance of SOL 500 / SOL 3 to achieve a UVA irradiance of 1.7 mW/cm² (The resulting dose will be 1 J/cm² per 10 min. exposure time)
5. According to the number of plates to be exposed concurrently, check the exposure area for equal distribution of irradiance:
A range of 1.6 - 1.8 mW/cm2 is acceptable.
Important: A maximum difference of 1.5 and 1.9 mW/cm2 can be accepted, if positions of the plates with low and high irradiance are changed after half time of the irradiation (30 minutes) is reached (like chess castling).
Calibration of the SOL 500 / SOL 3 shall be checked as described above each time before performing a phototoxicity assay. In case measurements with the UV radiometer reveal unexpected results, either the metal halide burner may have reached the end of it's shelflife, or the radiometer is de-calibrated due to various reasons. In this case, a second reference radiometer of the same type and calibration, which is has not been handled every day and kept in the dark shall be used for cross check.
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