Laser-Induced Breakdown Spectroscopy (LIBS) for spectral characterization of regular coffee beans and luwak coffee bean

Nufiqurakhmah Nufiqurakhmah, Aulia Nasution*, Hery Suyanto

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)

Abstract

Luwak (civet) coffee refers to a type of coffee, where the cherries have been priorly digested and then defecated by a civet (Paradoxurus Hermaphroditus), a catlike animals typically habited in Indonesia. Luwak will only selectively select ripe cherries, and digesting them by enzymatic fermentation in its digestive system. The defecated beans is then removed and cleaned from the feces. It is regarded as the world's most expensive coffee, Traditionally the quality of the coffee is subjectively determined by a tester. This research is motivated by the needs to study and develop quantitative parameters in determining the quality of coffee bean, which are more objective to measure the quality of coffee products. LIBS technique was used to identify the elemental contents of coffee beans based on its spectral characteristics in the range 200-900 nm. Samples of green beans from variant of arabica and robusta, either regular and luwak, were collected from 5 plantations in East Java. From the recorded spectra, intensity ratio of nitrogen (N), hydrogen (H), and oxygen (O) as essential elements in coffee is applied. In general, values extracted from luwak coffee bean is higher with increases 0.03% - 79.93%. A Discriminant Function Analysis (DFA) also applied to identify marker elements that characterize the regular and luwak beans. Elements of Ca, W, Sr, Mg, and H are the ones used to differentiate the regular and luwak beans from arabica variant, while Ca and W are the ones used to differentiate the regular and luwak beans of robusta variant.

Original languageEnglish
Title of host publicationSecond International Seminar on Photonics, Optics, and Its Applications, ISPhOA 2016
EditorsAgus Muhamad Hatta, Aulia M.T. Nasution
PublisherSPIE
ISBN (Electronic)9781510607514
DOIs
Publication statusPublished - 2016
Event2nd International Seminar on Photonics, Optics, and Its Applications, ISPhOA 2016 - Legian - Kuta, Bali, Indonesia
Duration: 24 Aug 201625 Aug 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10150
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference2nd International Seminar on Photonics, Optics, and Its Applications, ISPhOA 2016
Country/TerritoryIndonesia
CityLegian - Kuta, Bali
Period24/08/1625/08/16

Keywords

  • Civet coffee
  • Laser-Induced Breakdown Spectroscopy (LIBS)
  • Spectral characterization

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