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Rapid and sensitive SERS method for determination of Rhodamine B in chili powder with paper-based substrates

  • Shuang Lin
  • , Wu Li Ji Hasi*
  • , Xiang Lin
  • , Si Qin Gao Wa Han
  • , Xiu Tao Lou
  • , Fang Yang
  • , Dian Yang Lin
  • , Zhi Wei Lu
  • *Corresponding author for this work
  • Harbin Institute of Technology
  • Inner Mongolia University for Nationalities

Research output: Contribution to journalArticlepeer-review

Abstract

Surface-enhanced Raman spectroscopy (SERS) was used for detecting Rhodamine B (RB) which is often added illegally to chili powder. Based on density functional theory, the Raman spectrum of RB was calculated and characteristic peaks of RB were assigned to the corresponding vibrational modes. RB was detected utilizing paper-based SERS substrates which were fabricated via a liquid-liquid interface-mediated self-assembly technique. Meanwhile, with simple sample pretreatment, the detection limit could reach 10-6 g g-1 for RB in chili powder (5 × 10-7 g mL-1 in extraction agent). Within the concentration range from 10-2 g g-1 to 10-6 g g-1, Raman intensity follows a certain function in relation to the concentration of RB. The recovery of this method ranges from 96.4% to 108.9%, which gives rapid and reliable quantitative detection of RB in chili powder. Therefore, the proposed SERS method is suitable for on-site detection and analysis of RB in chili powder.

Original languageEnglish
Pages (from-to)5289-5294
Number of pages6
JournalAnalytical Methods
Volume7
Issue number12
DOIs
StatePublished - 21 Jun 2015

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