Antibacterial and Antifungal Properties of halloysite nanotubes by loaded Linalool

Linalool has good antibacterial and antifungal properties, but is volatile and thermally unstable. Halloysite nanotubes (HNTs) are often used as nanocarriers because of their special hollow pore structure and their ability to protect and release active substances. Therefore, the study of HNTs loaded with linalool (LNL) was carried out and antimicrobial tests were performed. Preparation of linalool acidified halloysite nanotubes (L-AC-HNTs) as a novel antibacterial and antifungal agent by loading LNL into the lumen of 3 mol/L hydrochloric acid acidified halloysite nanotubes (AC-HNTs) using a vacuum-negative pressure method. The inhibitory effects of different additive amounts of L-AC-HNTs were investigated on Escherichia coli, Staphylococcus aureus, Aspergillus niger, and Penicillium oryzae, which are commonly found in bamboo products. The thermal stability and slow-release properties of the additive were also tested and characterised. The results showed that 1.5% (W/V) of L-AC-HNTs had the best inhibitory effect on the above bacteria and fungi, and the inhibition rate reached 100%. The peak thermal decomposition rate of L-AC-HNTs reached 279.9℃, which was 81.5℃ higher than that of the pure LNL, and the retention rate of LNL after volatilisation of the AC-HNTs at 50℃ for 72 h was 94.6%, with only the loss of LNL. 94.6%, with only 3.4% loss, while the retention rate of pure LNL was 8%, and the LNL loading increased from 5.0% to 15.6% at the highest after acid etching.The broad-spectrum bacteriostatic property and thermal stability of L-AC-HNTs provide references to its application in bamboo products.