Effect of low power microwave on microbial growth and metabolism: Microwave-Microbe Interaction
This study aimed at investigating the effect of low power (90 W) microwave radiation (2450 MHz) on microbial growth, enzyme activity (protease and urease), and aflatoxin production. Thermal effect was avoided by keeping inoculum in ice while treating with microwave (for varying duration i.e. 2, 4, and 6 min). After 6 min MW treatment to S. aureus, its growth was stimulated over control by ~10%. Total protease activity in Aeromonas hydrophila witnessed a 33% decrease as compared to control after a microwave exposure of 2 min. Similar decrease of 24% in total protease activity of Candida albicans was observed after microwave exposure of 6 min. Staphylococcus aureus lost its urease activity completely after microwave treatment. Aflatoxin production was completely inhibited in Aspergillus parasiticus after microwave exposure of 2, 4, and 6 min. However, it required a 6 min microwave exposure for complete inhibition of aflatoxin production in Aspergillus flavus. Our results positively suggest existence of microwave specific non-thermal effect on microbial growth and metabolism.
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List of tables
1 Urease producing organisms 18
Results and discussion 26
1 Effect of different duration of MW on growth of E coli same day 28
19 Effect of MW radiation on growth and urease activity of M furfur 42
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acidic and alkaline Acidic protease activity activity IUX 10-4 aflatoxin production albicans alkaline protease activity Bacillus subtilis bacteria broth cells in terms cells were taken cerevisiae Change compared change in growth compared to control Comparision of different Comparison of effect control Alkaline protease culture decreased growth dielectric different duration dipole Duration of MW Effect of different effect of MW electric field electromagnetic spectrum energy enzyme enzyme activity Escherichia coli Figure flavus frequency furfur gentamicin gram-negative growth and aflatoxin growth and urease growth was increased heating hydrophila incubated inoculum low power mechanisms microwave radiation molecular MW exposure MW on growth MW oven MW pretreatment MW radiation MW treated cells MW treatment observed Optical Density parasiticus polar molecules protease activity IUX protein proton radiation on acidic radiation on growth rotational soliton solution spores sterile taken as 100 temperature thermal effect total protease activity urea urease activity yeast µg/mL