?url_ver=Z39.88-2004&rft_id=1314071036&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=STUDI+PENGGUNAAN+SPEKTRA+DATA+DI+DAERAH+ULTRAVIOLET+VISIBLE+DAN+METODE+PLS-DA+UNTUK+DISKRIMINASI+BEBERAPA+KOPI+SPESIALTI+INDONESIA+&rft.creator=MAGDALENA+TYAS+PRATIWI+%2C+1314071036&rft.subject=Pertanian+(+Umum+)&rft.subject=Teknologi+(General)&rft.description=Penelitian+ini+bertujuan+untuk+membedakan+jenis+kopi+spesialti+(kopi+Gayo%2C+Kintamani%2C+dan+Wamena)+berdasarkan+sifat+optik+menggunakan+UV-Vis+Spectroscopy.++Penelitian+ini+telah+dilaksanakan+pada+bulan+Mei+sampai+Juni+2017.++Komposisi+bahan+yang+digunakan+pada+setiap+sampel+dalam+penelitian+ini+yaitu+1+gram+dengan+jumlah+sampel+sebanyak+50+sampel+untuk+setiap+jenis+kopi+Gayo%2C+Kintamani%2C+dan+Wamena.++Setiap+sampel+diambil+data+spektra+sebanyak+2+kali.++Setelah+didapatkan+data+absorban%2C+langkah+selanjutnya+yaitu+menggabungkan+data+absorban+dari+sampel+kopi+Gayo%2C+Kintamani%2C+dan+Wamena+ke+dalam+Microsoft+Excel+yang+kemudian+akan+diolah+menggunakan+software+The+Unscrambler+versi+9.2.++%0D%0AData+absorban+dari+300+sampel+diolah+menggunakan+metode+Principal+Component+Analysis+(PCA)+untuk+mendapatkan+nilai+faktor+dari+Principal+Component+(PC).++Setelah+itu%2C+model+kalibrasi+dan+validasi+dibangun+menggunakan+metode+PLS-DA.++Selanjutnya+dilakukan+evaluasi+model+menggunakan+beberapa+parameter+seperti+R2%2C+RMSEC%2C+RMSECV%2C+dan+RMSEP.++Hasil+dari+kalibrasi+dan+validasi+menunjukkan+bahwa+sampel+yang+berhasil+dibedakan+dengan+menggunakan+UV-Vis+Spectroscopy+yaitu+sampel+Gayo-Kintamani+dengan+nilai+R2Cal+sebesar+0%2C94+dan+R2Val+sebesar+0%2C85%2C+sampel+Gayo-Wamena+dengan+nilai+R2Cal+sebesar+0%2C14+dan+R2Val+sebesar+0%2C11%2C+sampel+Kintamani-Wamena+dengan+nilai+R2Cal+sebesar+0%2C95+dan+R2Val+sebesar+0%2C93%2C+dan+sampel+Gayo-Kintamani-Wamena+dengan+nilai+R2Cal+sebesar+0%2C11+dan+R2Val+sebesar+0%2C09.++Sedangkan+untuk+sampel+Gayo-Kintamani+dengan+nilai+R2Pred+sebesar+0%2C92%2C+Gayo-Wamena+dengan+nilai+R2Pred+sebesar+0%2C17%2C+Kintamani-Wamena+dengan+nilai+R2Pred+sebesar+0%2C94%2C+dan+Gayo-Kintamani-Wamena+dengan+nilai+R2Pred+sebesar+0%2C13+dapat+dikatakan+tidak+berhasil+dibedakan+karena+kopi+Gayo+dan+Wamena+memiliki+jenis+tanah+yang+sama+yaitu+ultisol.++%0D%0AKata+Kunci+%3A+kopi%2C+UV-Vis+Spectroscopy%2C+Principal+Component+Analysis+(PCA)%2C+Partial+Least+Square+Discriminant+Analysis+(PLS-DA)%0D%0A%0D%0A%0D%0A%0D%0Aabstract%0D%0A%0D%0AThe+aim+of+the+research+was+to+distinguish+the+types+of+specialty+coffee+(Gayo+coffee%2C+Kintamani+coffee%2C+and+Wamena+coffee)+based+on+optical+properties+using+UV-Vis+Spectroscopy.++The+research+was+conducted+from+May+to+June+2017.++The+composition+of+the+material+used+in+each+sample+in+this+research+was+1+gram+with+50+samples+in+total+for+Gayo%2C+Kintamani%2C+and+Wamena.++Spectral+data+for+each+sample+were+acquired+twice.++After+obtaining+absorbance+data%2C+the+next+step+was+to+combaine+absorbance+data+from+Gayo%2C+Kintamani%2C+and+Wamena+coffee+samples+into+Microsoft+Excel+which+will+be+analyzed+by+using+The+Unscrambler+version+9.2+software.++%0D%0AThe+total+300+absorbance+data+were+processed+using+Principal+Component+Analysis+(PCA)+method+to+obtain+factor+values+from+Principal+Component+(PC).++Then%2C+the+calibration+and+validation+model+were+developed+using+Partial+Least+Square+Discriminant+Analysis+(PLS-DA)+method.++The+model+was+evaluated+using+several+parameters+such+as+R2%2C+RMSEC%2C+RMSECV%2C+and+RMSEP.++The+result+of+calibration+and+validation+showed+that+the+samples+were+successfully+differentiated+using+UV-Vis+Spectroscopy+which+Gayo-Kintamani+has+R2Cal+value+of+0%2C94+and+R2Val+value+of+0%2C85%2C+Gayo-Wamena+has+R2Cal+value+of+0%2C14+and+R2Val+value+of+0%2C11%2C+Kintamani-Wamena+has+R2Cal+value+of+0%2C95+and+R2Val+value+of+0%2C93%2C+and+Gayo-Kintamani-Wamena+has+R2Cal+value+of+0%2C11+and+R2Val+value+of+0%2C09.++The+prediction+that+was+resulted+from+Gayo-Kintamani+with+R2Pred+value+of+0%2C92%2C+Gayo-Wamena+with+R2Pred+value+of+0%2C17%2C+Kintamani-Wamena+with+R2Pred+value+of+0%2C94%2C+and+Gayo-Kintamani-Wamena+with+R2Pred+value+of+0%2C13.++Meanwhile%2C+the+samples+of+Gayo-Wamena+and+Gayo-Kintamani-Wamena+can+not+be+distinguished+because+Gayo+and+Wamena+coffees+have+the+same+type+of+soil+that+is+ultisol.++%0D%0AKeywords+%3A+coffee%2C+UV-Vis+Spectroscopy%2C+Principal+Component+Analysis+(PCA)%2C+Partial+Least+Square+Discriminant+Analysis+(PLS-DA)+&rft.publisher=Fakultas+Pertanian&rft.date=2017-12-19&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F29915%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F29915%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F29915%2F3%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++MAGDALENA+TYAS+PRATIWI+%2C+1314071036++(2017)+STUDI+PENGGUNAAN+SPEKTRA+DATA+DI+DAERAH+ULTRAVIOLET+VISIBLE+DAN+METODE+PLS-DA+UNTUK+DISKRIMINASI+BEBERAPA+KOPI+SPESIALTI+INDONESIA.++Fakultas+Pertanian%2C+Universitas+Lampung.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F29915%2F