Karakterisasi Penciri Spektral Biji Kopi Mentah Biasa Dan Biji Kopi Mentah Luwak Dengan Laser-Induced Breakdown Spectroscopy Libs

Nufiqurakhmah, . (2016) Karakterisasi Penciri Spektral Biji Kopi Mentah Biasa Dan Biji Kopi Mentah Luwak Dengan Laser-Induced Breakdown Spectroscopy Libs. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kopi luwak adalah kopi khas Indonesia yang berasal dari buah kopi yang dimakan oleh luwak (Paradoxurus Hermaphroditus) dan bijinya dikeluarkan bersama kotorannya dalam bentuk biji HS (hard skin). Kopi ini merupakan kopi termahal di dunia sehingga penentuan kualitas menjadi sangat penting. Selama ini penentuan kualitas kopi masih dilakukan oleh pencicip kopi sehingga bersifat subjektif. Laserinduced breakdown spectroscopy (LIBS) adalah metode spektroskopi atomik yang dapat digunakan untuk mengidentifikasi kandungan unsur biji kopi biasa dan biji kopi luwak berdasarkan karakter spektralnya. Pada penelitian ini digunakan pada enam pasang sampel biji kopi mentah biasa dan luwak dari wilayah Jawa Timur untuk dianalisis dengan LIBS. Pengolahan data LIBS dilakukan dengan perhitungan pada luas area daerah yang terdapat puncak. Metode rasio intensitas diterapkan dengan membandingkan unsur – unsur N, H, dan O sebagai unsur penting penyusun senyawa pada kopi dengan unsur utama. Hasil perbandingan diperoleh nilai rasio intensitas luwak lebih tinggi dengan nilai kenaikan 0,03% - 79,93%. Discriminant Function Analysis (DFA) juga diterapkan untuk mengidentifikasi unsur yang mencirikan biji kopi mentah biasa dan biji kopi mentah luwak. Untuk penciri biji kopi mentah biasa dan luwak arabika digunakan unsur - unsur Ca, W, Sr, Mg, dan H, sedangkan untuk penciri biji kopi mentah robusta digunakan unsur – unsur Ca dan W. ============================================================= Kopi Luwak (luwak coffee) is Indonesian coffee, where the cherries were priorly digested by a civet (Paradoxurus Hermaphroditus) and they were taken out along with feces in the form of hard skin seeds. This coffee is the most expensive coffee in the world so that the determination of the quality to be very important. During this time, the quality of the coffee is still determined by the tester which it is subjective. Laser-induced breakdown spectroscopy (LIBS) is the atomic spectroscopy methods that can be used to identify the element content of the regular coffee beans and luwak coffee beans based on its spectral character. This research, used six pairs of samples of regular green coffee beans and luwak green coffee beans from East Java are analyzed by LIBS. LIBS data processing method was performed by calculated the peak area. The intensity ratio of N, H, and O as essential elelments constituent compounds in coffee was applied with comparing the elements with the host element. The comparison results obtained that the intensity ratio values of luwak coffee bean is higher with increases 0.03% - 79.93%. Discriminant Function Analysis (DFA) was applied to identify the elements that characterize the regular and luwak coffee beans. Marker elements of coffee beans were identified by this method. Ca, W, Sr, Mg, and H were used to differentiate the regular and luwak coffee beans of arabica, while Ca and W were used to differentiate the regular and luwak coffee beans of robusta.

Item Type: Thesis (Undergraduate)
Additional Information: RSF 621.361 Nuf k
Uncontrolled Keywords: Biji kopi mentah, kopi luwak, LIBS, unsur penting, spektral
Subjects: T Technology > TP Chemical technology
T Technology > TP Chemical technology > TP156 Crystallization. Extraction (Chemistry). Fermentation. Distillation. Emulsions.
Divisions: Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User: EKO BUDI RAHARJO
Date Deposited: 10 Oct 2019 01:59
Last Modified: 10 Oct 2019 01:59
URI: http://repository.its.ac.id/id/eprint/71099

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