Cellulose isolation and core-shell nanostructures of cellulose nanocrystals from chardonnay grape skins

Ping Lu, You Lo Hsieh

Research output: Contribution to journalArticlepeer-review

121 Scopus citations

Abstract

This is the first report on the derivation and structures of cellulose nanocrystals from grape skins. Pure cellulose was isolated from chardonnay grape skins at a 16.4% yield by a process involving organic extraction, acid and base dissolutions, and basic and acidic oxidation. The as-extracted cellulose was 54.9% crystalline and microfibrillar. Acid hydrolysis (64-65% H 2SO4 45 °C, 30 min) of grape skin cellulose produced the more crystalline (64.3%) cellulose nanocrystals (CNCs) that appeared mostly as spherical nanoparticles with diameters ranging from 10 to 100 nm and a mean diameter of 48.1 (±14.6) nm as observed by TEM. AFM further disclosed the spherical nanoparticles actually consist of a nano-rod core (seed) surrounded by numerous tiny cellulose fragments as the shell. Interestingly, the spherical core-shell nanoparticles resemble the shape of grape bundles, the starting biomass, may be assembled via interfacial hydrogen bonds.

Original languageEnglish (US)
Pages (from-to)2546-2553
Number of pages8
JournalCarbohydrate Polymers
Volume87
Issue number4
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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