Tween 80 is a nonionic surfactant and emulsifier that reduces bacterial adherence and inhibits biofilm formation. Tween 80 is widely used as a co-solvent in pharmacology experiments because of its ability to enhance the solubility of compounds in the aqueous phase.

METHODS: S. aureus, L. monocytogenes, and P. fluorescens were treated with Tween 80 (0.1% (v/v) in TSB), and growth curves were documented by measuring optical densities at OD600 every 20 min.
RESULTS: Tween 80 increased the growth rate of S. aureus. tween 80 did not affect the growth of L. monocytogenes. the growth rate of the P. fluorescens tween 80 group was initially higher than that of the control group, but then declined again, with the maximum OD significantly lower than that of the control. [1]

METHODS: To study the effect of solvents on locomotor activity in mice, Tween-80/Tween-20 (4%-64% (v/v) in saline) was administered intraperitoneally as a single injection to (BALB/c * DBA/2) F1 mice, and the locomotor activity was monitored for 12 h after the administration.
RESULTS: Tween-80 significantly decreased the locomotor activity of mice at a concentration of 32%, while Tween-20 significantly decreased the locomotor activity of mice at a concentration of 16%. [2]
METHODS: To detect anti-tumor activity in vivo, ATL (15-30 mg/kg in 5% DMSO + 30% PEG300 + 10% Tween 80 + 55% PBS) was injected intraperitoneally into BALB/c mice harboring human thyroid carcinoma tumor 8505C once daily for nine weeks.
RESULTS: ATL inhibited the growth of 8505C cell xenografts in vivo. [3]