<![CDATA[ABSTRAK Telah dilakukan Perbandingan Kadar Etanol Hasil Fermentasi Uwi Varietas Putih, Ungu dan Orange (Dioscorea alata. L). Penetapan kadar etanol digunakan alat spektrofotometer UV-Vis secara mikrodifusi dengan alat cawan Conway. Panjang gelombang maksimum yang didapat pada 446 nm, persamaan garis regresi yang diperoleh y = -0,3765x + 0,7835. Hasil validasi metode diperoleh akurasi metode dan presisi alat yang baik dengan koefisien korelasi (r) -0,9983, dengan limit deteksi 0,0546 g/dL, limit kuantitasi 0,1821 g/dL. Dari hasil penetapan kadar uwi diperoleh kadar rata-rata sebesar 3,2998%; 2,6152%; 2,6947% berturut-turut untuk sampel uwi putih, uwi orange dan uwi ungu. Kadar etanol uwi sampel berbeda bermakna sesuai hasil uji anava, dimana diperoleh nilai signifikan P lebih kecil dari α (0,000 < 0,05). Kata kunci : Uwi (Dioscorea alata L.), etanol, spektrofotometri UV-Vis, cawan Conway, fermentasi, perbandingan kadar, mikrodifusi. ABSTRACT Has been done a comparation about Ethanol from Fermentation White, Purple, and Orange Uwi Variety. Determination of ethanol using UV-VIS spectophotometry according to microdifusion and using Conway dish. Beer’s law is obeyed maximum length at 446 nm and equality of regretion line obtained by y = -0.3765x + 0.7835. The result of validation method obtained accuration of method and good precision appliance with the correlation coefficient ( r ) -0.9983. Limit of detection 0.0546 g/dL. Limit of quantitation 0.1821 g/dL. From result determination of uwi’s sampels obtained by 3.2998%; 2,6152%; 2,6947% continued for white, orange and purple uwi’s samples. Rate of uwi’s samples have different meaning of according to result of ANAVA test obtained by meaning value (P) smaller than α value (0,000]]>
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