Although most strains of escherichia coli (E. coli) are harmless, some serotypes can cause serious food poisoning in humans. It is very difficult to eliminate E. coli from our lives. Here we show that E. coli can be eliminated by hydroxyapatite (HAp). Because HAp has a positive charge, the material and E. coli are attracted through electrostatic interactions. Additionally, because the surface of HAp is porous, it enters the pores of the HAp surface removing them from the environment. The amount of adsorption was observed to increase over time, and the zeta potential value of the material tended to be similar to that of E. coli. This phenomenon is thought to have zeta potential similar to that of E. coli as it is adsorbed onto the HAp surface over time. E. coli stained with crystal violet was spread on a glass slide and HAp porous sol powder was dropped to remove the E. coli. We expect that this analysis will open a new direction for antibacterial materials.

1. Introduction
2. Experimental Procedure
    2.1. Measuring particle size and zeta potential
    2.2. E. coli and HAp adsorption experiment
3. Results and Discussion
    3.1. Measure the particle size
    3.2. Measure the PH
    3.3. Measure the zeta potential
    3.4. E. coli and HAp adsorption experiment
    3.5. Antibacterial properties
    3.6. Adsorption mechanism of E. coli
4. Conclusion
Acknowledgement
References
Author Information

• Su-Chak Ryu(School of Nanomechatonics Engineering, Pusan National University, Pusan 46241, Republic of Korea)
• Dong-Hun Lee(School of Nanomechatonics Engineering, Pusan National University, Pusan 46241, Republic of Korea)
• Jae-Hoon Jeong(School of Nanomechatonics Engineering, Pusan National University, Pusan 46241, Republic of Korea)
• Sung-Kwang Jo(School of Nanomechatonics Engineering, Pusan National University, Pusan 46241, Republic of Korea) Corresponding author