?url_ver=Z39.88-2004&rft_id=1314071026&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=STUDI+KUANTIFIKASI+PENCAMPURAN+KOPI+BUBUK%0D%0ADEKAF+DAN+NON%E2%88%92DEKAF+MENGGUNAKAN%0D%0AUV-Vis+SPECTROSCOPY+DAN+REGRESI+PLS&rft.creator=Galih+Pratama%2C+1314071026&rft.subject=Pertanian+(+Umum+)&rft.description=Kopi+merupakan+suatu+komoditas+yang+mengandung+banyak+kafein.+Hal+ini+menyebabkan+peneliti+dan+penikmat+kopi+berinisiatif+untuk+menurunkan+kadar+kafein+pada+kopi+agar+resiko+yang+didapat+dari+mengkonsumsi+kopi+berkurang.+Kopi+dekaf+adalah+kopi+rendah+kafein+yang+memerlukan+proses+tambahan+waktu+dan+biaya+sehingga+harganya+cukup+mahal.+Mahalnya+kopi+dekaf+berakibat+pada+banyaknya+pemalsuan+pada+produk+kopi+dekaf.+Kopi+dekaf+biasanya+dijual+dalam+bentuk+bubuk+dan+sangat+sulit+membedakan+kopi+dekaf+dan+non-dekaf+dengan+mata.+Untuk+itu+pada+penelitian+ini%2C+UV-Vis+spectroscopy+diujicobakan+untuk+mendeteksi+adanya+pencampuran+kopi+dekaf+dengan+kopi+non-dekaf.%0D%0ABahan+yang+digunakan+setiap+sampel+adalah+1+gram%2C+dengan+jumlah+sampel+sebanyak+100+sampel+dengan+komposisi+dekaf+%3A+non-dekaf+%3D+10%25+%3A+90%25%2C+20%25+%3A+80%25%2C+30%25+%3A+70%25%2C+40%25+%3A+60%25%2C+50%25+%3A+50%25%2C+60%25+%3A+40%25%2C+70%25+%3A+30%25%2C+80%25+%3A+20%25%2C+90%25+%3A+10%25%2C+dan+100%25+dekaf+murni.+Sebelum+diukur+mengunakan+UV-Vis+spectroscopy+setiap+1+gram+kopi+dicampur+dengan+50+ml+aquades+dengan+%0D%0Asuhu+98%C2%BAC+kemudian+dihomogenkan+menggunakan+stirrer+selama+10+menit%2C+lalu+disaring+menggunakan+kertas+saring+dan+untuk+pengenceran+ditambahkan+aquades+dengan+perbandingan+1+%3A+20%2C+kemudian+dimasukan+ke+dalam+cuvet+sebanyak+2+ml+dan+diukur+menggunakan+UV-Vis+spectroscopy.+Pada+penelitian+ini+menggunakan+metode+regresi+partial+least+squares+(PLS)+dengan+program+The+Unscrambler+versi+9.2.+Untuk+melakukan+uji+taraf+kepercayaan+dari+model+yang+dibangun+menggunakan+perangkat+lunak+SPSS+(Statistical+Package+for+the+Social+Science)+versi+19.%0D%0APersamaan+kalibrasi+terbaik+diperoleh+untuk+tipe+spektra+smoothing+Savitzky-Golay+dan+SNV+pada+panjang+gelombang+250-450+nm.+Persamaan+ini+memiliki+nilai+koefisien+determinasi+yaitu+R_kal%5E2%3D+0%2C99+dan+R_val%5E2+%3D+0%2C98%2C+Nilai+RPD+%3D+6%2C61+dan+faktor+(F)+%3D+2.+Sedangkan+nilai+SEC+%3D+2%2C1%25+dan+SEP+%3D+4%2C4%25+dengan+selisih+SEC+dan+SEP+yang+paling+rendah+yaitu+2%2C3%25.+Dengan+uji+beda+dua+sampel+berpasangan+pada+taraf+kepercayaan+95%25+dapat+dibuktikan+bahwa+persentase+kandungan+kopi+dekaf+aktual+dan+prediksi+di+dalam+campuran+kopi+dekaf+dan++non-dekaf+tidak+berbeda+nyata+dan+metode+analisis+berbasis+UV-Vis+spectroscopy+dapat+terbangun+dengan+baik.%0D%0AKata+Kunci+%3A+Kopi+dekaf%2C+Model+kalibrasi%2C+Regresi+PLS%2C+Uji+keaslian%2C+UV-Vis+spectroscopy.%0D%0A%0D%0A%0D%0A%0D%0AABSTRACT%0D%0A%0D%0ACoffee+is+a+commodity+that+contains+a+lot+of+caffeine.+For+this+reason%2C+researchers+and+coffee+lover+to+take+initiative+in+lowering+levels+of+caffeine+in+coffee+to+reduce+the+risk+of+drinking+coffee.+Decaf+coffee+is+a+low-caffeine+coffee+that+requires+an+extra+process+of+time+and+cost+so+that+the+price+of+decaf+coffee+is+quite+expensive.+The+high+price+of+decaf+coffee+has+resulted+in+many+counterfeits+on+decaf+coffee+products.+Decaf+coffee+is+usually+traded+in+ground+roasted+and+is+very+difficult+to+distinguish+with+the+naked+eyes.+Therefore+in+this+study%2C+UV-Vis+spectroscopy+was+used+to+detect+the+adulteration+of+decaf+coffee+with+non-decaf+coffee.%0D%0A%0D%0AEach+sample+has+1+gram+weight.+Total+sample+used+100+samples.+The+composition+of+decaf+and+non-decaf+%3D+10%25%3A+90%25%2C+20%25%3A+80%25%2C+30%25%3A+70%25%2C+40%25%3A+60%25%2C+50%25%3A+50+%25%2C+60%25%3A+40%25%2C+70%25%3A+30%25%2C+80%25%3A+20%25%2C+90%25%3A+10%25%2C+and+100%25+pure+decaf%2C+before+UV-Vis+spectroscopy+measurements%2C+an+extraction+procedure+was+conducted.+In+this+extraction%2C+the+sample+was+added+with+50+ml+aquades+(temperature+98%C2%BAC)+it++%0D%0Awas+followed+by+homogenizing+the+sampel+using+stirrer+for+10+minute%2C+then+filtered+using+filter+paper.+The+extracted+sample+was+diluted+with+aquades+at+1%3A20%2C+then+2+ml+of+diluted+sample+was+pipetted+in+to+cuvet+cell+and+measuring+using+UV-Vis+spectroscopy.+Partial+least+squares+(PLS)+regression+was+used+to+develop+calibration+model+by+using+The+Unscrambler+version+9.2+program.+To+evaluate+the+confidence+level+and+develop+of+model+the+SPSS+(Statistical+Package+for+the+Social+Science)+version+19+was+used.%0D%0A%0D%0AThe+best+calibration+model+was+obtained+for+the+Savitzky-Golay+Smoothing+and+SNV+spectra+in+the+range+of+250-450+nm.+This+model+has+the+coefficient+of+determination+R_cal%5E2%3D+0%2C99+and+R_val%5E2%3D+0%2C98%2C+RPD+%3D+6%2C61+and+PLS+factor+(F)+%3D+2.+While+SEC+%3D+2%2C1%25+and+SEP+%3D+4%2C+4%25+with+the+lowest+SEC+and+SEP+difference+of+2.3%25.+Using+with+paired+t-test+at+95%25+confidence+level%2C+it+can+be+proved+that+actual+and+predicted+percentage+of+decaf+coffee+content+was+not+significantly+different+and+UV-Vis+spectroscopy+based+analysis+method+can+be+well+established.%0D%0A%0D%0AKeywords%3A+Authenticity%2C+Calibration++model%2C+Decaf++coffee%2C+PLS+Regression%2C+UV-Vis+spectroscopy.&rft.publisher=Fakultas+Pertanian&rft.date=2018-06-06&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F32422%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F32422%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F32422%2F3%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++Galih+Pratama%2C+1314071026++(2018)+STUDI+KUANTIFIKASI+PENCAMPURAN+KOPI+BUBUK+DEKAF+DAN+NON%E2%88%92DEKAF+MENGGUNAKAN+UV-Vis+SPECTROSCOPY+DAN+REGRESI+PLS.++Fakultas+Pertanian%2C+Universitas+Lampung.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F32422%2F