Fig. 9From: Structural and functional stability of the sulfur-free surfactant protein B peptide mimic B-YL in synthetic surfactant lipidsAverage ± SEM surface tension values of quasi-static cycles at captive bubble surfactometry of three B-YL surfactant productions produced in 2017 and re-measured in 2020. Minimum surface tension (lower part of the curves) during quasi-static cycling was < 2 mN/m when tested shortly after production and after three years of refrigerated storage. Maximum surface tension (upper part of the curves) decreased slightly over timeBack to article page