# Numerical Simulation of Interaction between Plasma and Azithromycin Based on Molecular Dynamics
## 3 Results Analysis
### Inter-Ring and Intraring Fractures  
As shown in Figure 10, azithromycin is composed of three-ring structures, ether bonds connect the rings, and the three rounds are not in the same plane. Figure 10 shows the bond length of each chemical bond of the azithromycin molecule. It can be seen from the chemical principle that the shorter the bond length of the covalent bond, the greater the  
Figure 8: Oxidation of alcohol groups.  
Figure 9: Bonding and oxidation of carbon containing lone electrons.  
bond energy and the more stable the bond structure. As shown in Figure 10, some C-C bonds and C-O bonds (ether bonds) have longer bond lengths and lower energy. Therefore, the ether bonds with lower bond energy are insufficient to support the ring structure in the interaction, being especially impacted by many active particles. The ether bond cleavage influenced by active-oxygen groups is also described in the literature [26]. As shown in Figure 11, influenced by the energetic particles, after breaking the C\({}_{3}\)-O\({}_{5}\) bond, the C\({}_{3}\)-H\({}_{4}\) and C\({}_{1}\)-H\({}_{2}\) bonds are broken simultaneously, forming a C\({}_{1}\)=O\({}_{5}\) double bond, and then the hydrogen atoms generated in this process and the free oxygen atoms form a water molecule. After C\({}_{3}\)-O\({}_{5}\) is broken, carbon atoms containing lone electrons recombine with active particles to form C\({}_{3}\)=O double bonds.  
The product prototype formed after the detachment of the nitrogen-containing ring in the molecule is called _Descladinose Azithromycin_. The product prototype after the reaction of the nonnitrogen-containing ring is called _L-cladinose_, as shown in Figure 12. However, due  
Figure 11: Inter-ring cleavage and oxidation of azithromycin.  
Figure 10: The bond lengths between atoms in the azithromycin molecule.  
to the dehydrogenation and oxidation reactions under the action of many active particles, the unsaturation and functional groups of the obtained product have undergone significant changes. However, from the skeleton's perspective, it can still be seen that it is very similar to the prototype molecule.  
After the ring is detached, the ether bond inside the ring may also be broken under the impact of active particles. Then, an alcohol group is generated, which can be further oxidized to an aldehyde group. The ether bond may be broken under the influence of acidity or alkalinity, so in the actual plasma degradation experiment of azithromycin, there will be more than one induction mechanism of this ring opening.  
Under the action of a large number of active particles, azithromycin undergoes a hydrogen abstraction reaction. Then, the carbon-carbon bond is broken under the impact of the energetic particles, and the breaking positions depend on the length of the bond. The longer the bond length, the easier it is to break the chemical bond. The longer the treatment time and the more active atoms, the faster the fracture and the greater the number of fractures.  
This section shows some essential plasma degradation products, critical chemical reactions, and the breaking and formation of crucial chemical bonds. After the reaction, there are many oxides, peroxides such as hydrogen superoxide, hydrogen peroxide, and carbon dioxide, as well as small molecules of carbon-containing organic compounds. This chapter aims to analyze its kinetic principle and the changes in vital chemical reactions to provide guidance and reasonable predictions for subsequent experiments.