In
this study, we showed that lignin nanoparticles (LNPs) with
controllable size could be prepared using the acetone/water cosolvent
(A/W) approach. The solubility of lignin in A/W of varied constitution
(10:0 to 0:10 v/v) was determined, and A/W containing 7:3 (v/v) acetone
to water was identified as the optimum solvent. A positive correlation
between LNP size and lignin concentration was observed, with the smallest
LNPs (28.5 ± 5.4 nm) obtained at 5.00 g/L of lignin, while serious
aggregation occurred at lignin concentrations above 100 g/L. The rotary
evaporation procedure used to remove acetone had no noticeable effect
on the size of LNPs. The obtained LNPs were utilized as emulsifiers
to stabilize oil-in-water Pickering emulsions of various oils. The
results indicated that the high efficiency of LNPs in stabilizing
Pickering emulsions was due to their irreversible adsorption at the
oil–water interface of the droplets. Overall, a straightforward
way for the controllable preparation of LNPs and their use as Pickering
emulsifiers was demonstrated.
Hybrid microcapsules with tunable properties and low permeability were fabricated via Pickering emulsion templates for the encapsulation of bioactive volatiles.
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