استعمال ليزر الدايود ذي القدرة العالية في تعقيم الماء و الحليب

الملخص EN

The possibility of using lasers in the sterilization of water and milk has been studied.Two types of diode laser has been used., the first one 2-watt 810 nm wavelength and the second 5 watt wavelength 1064 nm.

I rradiation of samples was taken place from the physiological saline containing the Escherichia coli bacteria in three sizes (0.3,0.2, 0.1) cm ³ in test tubes of size (0.5) cm³.

Samples were irradiated at different periods of time for each laser.

The results showed that after each irradiation we have obtained a highest kill of 100% of the bacteria by laser diode (2 W) through a period of 20 minutes.

In the diode laser (5 W) a recording of the highest kill rate of 100% has been obtained in 1.5 min period.

T he conducted results of disinfecting water with the killing rate 100% have been applied in the sterilization of milk contaminated with bacteria under the same conditions in which 100% kill rate have been achieved for both lasers.

T h e killing of these bacteria by these lasers was due to the influence of heat and pressure generated as a result of raising temperature because water absorbs of the infrared radiation , leading to rupture of living cells of pathogenic bacteria.