A study of the efficacy of bacterial biofilm cleanout for gastrointestinal endoscopes

Figure 1 Bacterial biofilm formation assay.

Figure 2 Cleaning steps of biofilm-coated sample tubes.

Figure 3 Mixture of detergent and bacteria cultured for 72 h. Left: The enzyme-containing washing, showing a homogeneous transparent liquid; Middle: A non-enzyme-containing detergent, showing in addition to a large amount of sediment at the bottom, the upper part was clean liquid; Right: The control group, showing bacteria bacilli and a small amount of sediment at the bottom.

Figure 4 The concave wall structure after mixture of detergent and Escherichia coli cultured; surfaces are part of the biofilm formation.

Figure 5 The concave wall structure after non-enzyme detergent (A), enzyme-containing detergent (B), and sterile distilled water (C) washing. A: No obvious biofilm residue; B: Massive biofilm structure residue; C: Relatively large biofilm attached to bacterial biomass, respectively.