Journal
CARBOHYDRATE POLYMERS
Volume 253, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117242
Keywords
Starch nanoparticles; Thermal stability; Hydrophobicity; Cross-linking; Citric acid
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Funding
- Korea Food Research Institute (KFRI) - Ministry of Science and ICT [E0164800-05]
- National Research Council of Science & Technology (NST), Republic of Korea [E0164800-05] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Starch nanoparticles were modified with citric acid and ethanol washing to enhance their thermal stability and hydrophobicity, successfully encapsulating beta-carotene as a model hydrophobic material with a high efficiency of approximately 80%. The modified SNPs showed improved thermal stability and hydrophobicity, with granular structure breaking down into smaller particles under certain conditions.
Starch nanoparticles (SNPs) were reacted at 130 degrees C for 1.5 h in the presence of citric acid (30 %) to enhance their thermal stability and hydrophobicity. Citric acid content in SNP was controlled by washing with different concentrations of ethanol (95 %, 70 % and 60 %) for 2, 5 and 10 min and then subjected to heat treatment at 130 degrees C. After the modification, the peak at 1732 cm(-1) representing ester bond was observed via FT-IR, and the intensity of the peak was decreased with a lower ethanol content in washing medium. For the 60 % ethanol condition, the granular structure was promptly fragmented into particles less than 50 nm in the aqueous solution. The modification enhanced the thermal stability and hydrophobicity of the SNPs. The modified SNPs was used as a nano-vehicle wall material for encapsulating beta-carotene as a model hydrophobic material. Approximately 80 % beta-carotene was encapsulated in the modified SNPs.
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