Figure 5.

Mechanical properties of the dry and wet zein fibers. (a) Elongation at break, of dry fibers with and without tetracycline hydrochloride (T) in dark green, wet drug-free fibers in grey, and wet drug-loaded fibers in orange. (b–d) Stress-strain curves, of dry drug-free fibers in dark green, dry drug-loaded fibers in light green, wet drug-free fibers in grey, and wet drug-loaded fibers in orange. Key: PEO, polyethylene oxide; SA, stearic acid; T, tetracycline hydrochloride; Z, zein; error bars represent standard deviation; ***, statistically significant difference at p < 0.001.