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.
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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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