PENGARUH PAPARAN MEDAN MAGNET ELF (EXTREMELY LOW FREQUENCY) 300 μT DAN 500 μT TERHADAP PERUBAHAN JUMLAH MIKROBA DAN pH PADA PROSES FERMENTASI TAPE KETAN

Abstract

Naturally, humans and other living things adapt to the radiation of electromagnetic waves coming from the sun and the use of electronic devices. The rapid development of technology and the use of electronic equipment cause the living things are exposed to the radiation of electromagnetic waves ELF (Extremely Low Frequency) whether it is consciously or not. Therefore, studies assessing the effects of exposure to ELF magnetic fields appear, one of them as the technology of food preservation and processing of fermentation products. Fermentation product which is often favored by the people is tape (fermented cassava). Generally, the durability of tape has a close relationship with the number of microbe especially acid-forming bacteria and pH value. The purpose of this study was to know the effect of 500μt and 300μt ELF magnetic fields to the change of microbes number and the pH on the fermentation process of sticky tape. The type of the study was experimental laboratories. The research design was a final observation type (subjects randomized post test only control group design). To calculate the number of microbes, it used dilution method and viewed with opti lab, while to test the degree of acidity (pH), it used receipts universal indicator. The results showed that 500μt and 300μt ELF magnetic fields exposure affect on the change in the number of microbes and the pH on the fermentation process of sticky tape. The highest decrease in the number of microbes was 0.50 x 1013 cells/mL with the 500 μT intensity of exposure at the time of exposure 72 hours after fermentation. The highest increase in pH was 1.00 with the 500 μT intensity of exposure at the time of exposure 24 hours after fermentation.