Controlled fragmentation of starch into nanoparticles using a dry heating treatment under mildly acidic conditions

Sumaira Miskeen, Eun Young Park, Jong Yea Kim

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Normal corn starch was treated with acidic ethanol solution with various concentrations of ethanol (0, 10, 30, 50 and 95%) and acid (0.0026, 0.0053 and 0.0079 M) and then subjected to a dry heating treatment for 1, 2 and 4 h at 130 °C to prepare starch nanoparticles. Size of nanoparticles was determined using DLS (dynamic light scattering). FT-IR (Fourier-transform infrared spectroscopy), XRD (X-ray diffraction) and TEM (transmission electron microscopy) were used to determine the structure and morphology of starch nanoparticles. As the ethanol concentration decreased, the starch granule readily fragmented into smaller particles when simply dispersed in water, and this was possibly by the preferential hydrolysis of the starch chains in the amorphous region. A higher ethanol concentration (50 and 95%) did not produce homogenous nanoparticles, however 30% ethanol concentration produced uniform nanoparticles with a mean diameter of 46.4 nm. The treatment condition (30% ethanol) partially broke the long-range crystalline order but left the short range order of the spherical nanoparticles intact. However, lower ethanol (<30%) concentrations induced severe damages in the both crystalline structures (long and short range) of starch granule.

Original languageEnglish
Pages (from-to)810-816
Number of pages7
JournalInternational Journal of Biological Macromolecules
Publication statusPublished - 2019 Feb 15
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Ministry of Science, ICT & Future Planning) ( NRF-2015R1C1A1A02036585 ).

Publisher Copyright:
© 2018 Elsevier B.V.


  • Acid hydrolysis
  • Dry heating
  • Starch nanoparticles

ASJC Scopus subject areas

  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Economics and Econometrics
  • General Energy


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