Ascorbic acid changes in cultured rabbit lenses after microwave irradiation

Area of Science:

• Ophthalmology
• Biophysics
• Radiation Biology

Background:

• Whole-body microwave radiation exposure in rabbits is known to decrease lens ascorbic acid.
• Ascorbic acid is a vital antioxidant in the eye lens, protecting against oxidative stress.

Purpose of the Study:

• To investigate the direct effect of S-band microwave radiation on ascorbic acid levels in cultured rabbit lenses.
• To determine if microwave radiation's effect on ascorbic acid is a thermal phenomenon.

Main Methods:

• Rabbit lenses were cultured at 37°C and exposed to pulsed or continuous wave S-band microwave radiation (0-200 mW/cm-2) for 10-15 minutes.
• Ascorbic acid levels were measured 1-3 days post-irradiation.
• Control lenses were maintained in identical time-temperature conditions without microwave exposure.

Main Results:

• Microwave radiation exposure led to a significant decrease in total ascorbic acid in rabbit lenses.
• No significant difference in ascorbic acid levels was observed between irradiated lenses and control lenses subjected to identical thermal conditions.
• Temperature variations during irradiation were independent of modulation type at a given average power density.

Conclusions:

• The reduction in ascorbic acid in rabbit lenses exposed to microwave radiation is a direct thermal effect.
• The findings suggest that microwave-induced heating, rather than the radiation's modulation, is responsible for ascorbic acid depletion in the lens.