Methyl Cellulose

The conformation of methyl cellulose (MC) in water was revisited by combined small-/wide-angle neutron scattering (S-WANS), static and dynamic light scattering (SLS/DLS), and viscometry studies. Seven commercial MCs were investigated under diluted conditions. From S-WANS, it is shown that MC does not behave as the conventionally postulated semi-flexible coil; rather it forms locally rigid rod-like particles whose diameter increases from 0.7 to 1.1 nm with Mw.
Overall, the results unambiguously show that MC adopts an elongated rigid rod or rectangular column conformation in an aqueous solution throughout the Mw range investigated. These data provide a new structural paradigm for interpreting MC's low-temperature gelation and processing behavior.

Fig. 1 Formation of rodlike Methyl Cellulose particles in aqueous solution. (Saiki E.; et al. 2022)

Bonetti L et al. reinforce methylcellulose (MC) for cell-sheet engineering by ester cross-linking with 1-5 wt% citric acid. Low, medium, and high cross-link densities (MC-L, M, H) cut equilibrium swelling from 3000% to 800%, raise Young's modulus from 5 kPa to 3.5 MPa, and shrink mesh size 60→11 nm while remaining non-cytotoxic. Collagen-coated MC-L/M films support L929 fibroblast growth to confluence at 37℃; cooling to 4℃ re-solubilizes the surface, allowing intact 15 mm sheets to detach enzyme-free within 20 min. Harvested sheets retain ECM, re-adhere to new plates within minutes and cells migrate actively, confirming viability and regenerative potential.

Fig. 2 Crosslinked Methyl Cellulose substrates for cell sheets. (Bonetti L.; et al. 2021)