Amino acid-coated nano-sized magnetite particles prepared by two-step transformation

Shao Long Tie, Yu Qiong Lin, Hyeon Cheol Lee, Youn-Sang Bae, Chang-Ha Lee

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

A series of amino acid-coated nano-sized magnetite (AA-NSM) particles such as leucine (Leu), arginine (Arg), cysteine (Cys), cystine, aspartate (Asp) and tyrosine (Tyr), were synthesized by a two-step transformation (TST) process. The TST process consists of the following steps: firstly preparing oxalate modified NSM (Ox-NSM) at pH 9 and secondly substituting AA for Ox to form AA-NSM at pH 5. Both the Ox- and AA-NSM particles were clearly confirmed by the FT-IR spectra and TGA curves. The content of each AA in the AA-NSM appeared different because of the difference in both the structure and isoelectric point of each AA molecule. It is noteworthy that Ox, as a template in the intermediate Ox-NSM, plays a key role in the formation of AA-NSM with free NH2 group inside. All of the AA-NSMs showed superparamagnetic property without hysteresis at room temperature and had strong saturated magnetization value (more than 50 emu/g), which may have potential applications in both biomedical and environmental areas.

Original languageEnglish
Pages (from-to)75-83
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume273
Issue number1-3
DOIs
Publication statusPublished - 2006 Feb 1

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Ferrosoferric Oxide
Magnetite
magnetite
amino acids
Amino acids
Amino Acids
Oxalates
oxalates
Cystines
aspartates
leucine
Arginine
Cystine
tyrosine
cysteine
Aspartic Acid
Leucine
Cysteine
Tyrosine
Hysteresis

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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abstract = "A series of amino acid-coated nano-sized magnetite (AA-NSM) particles such as leucine (Leu), arginine (Arg), cysteine (Cys), cystine, aspartate (Asp) and tyrosine (Tyr), were synthesized by a two-step transformation (TST) process. The TST process consists of the following steps: firstly preparing oxalate modified NSM (Ox-NSM) at pH 9 and secondly substituting AA for Ox to form AA-NSM at pH 5. Both the Ox- and AA-NSM particles were clearly confirmed by the FT-IR spectra and TGA curves. The content of each AA in the AA-NSM appeared different because of the difference in both the structure and isoelectric point of each AA molecule. It is noteworthy that Ox, as a template in the intermediate Ox-NSM, plays a key role in the formation of AA-NSM with free NH2 group inside. All of the AA-NSMs showed superparamagnetic property without hysteresis at room temperature and had strong saturated magnetization value (more than 50 emu/g), which may have potential applications in both biomedical and environmental areas.",
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Amino acid-coated nano-sized magnetite particles prepared by two-step transformation. / Tie, Shao Long; Lin, Yu Qiong; Lee, Hyeon Cheol; Bae, Youn-Sang; Lee, Chang-Ha.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 273, No. 1-3, 01.02.2006, p. 75-83.

Research output: Contribution to journalArticle

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