Profil Asam Lemak Tuna (Thunnus albacares) Loin dengan Penyemprotan Filtered Smoke selama Penyimpanan Beku : The profile of fatty acid of Tuna Loin (Thunnus albacores) sprayed by Filtered Smoke during frozen storage

The red color is one of the factors that determining freshness of tuna loin. To keep the red color of the tuna flesh, it has been treated by filtered smoke. Filtered smoke reduces the oxidative of fat as well as keep the fat quality. The objective of this research was to study the fatty acid composition  of tuna (Thunnus albacores) loin treated by filtered smoke. The research method was conducted experimentally. Tuna loin firstly sprayed by filtered smoke at a pressure 1 atm for 5 – 10 seconds before storage at freezing   temperature -25 ˚C for four weeks. Observations were 0 and  4 weeks and the parameters observed were the fatty acid profiles, atherogenic index (AI), thrombogenic index (TI), fat quality (h / H) and the index of polien. The result showed there were 29 types of fatty acids consisting of 13 types of saturated fatty acids (SFA), 6 types of monounsaturated fatty acids (MUFA) and 11 types of poly unsaturated fatty acids (PUFA). There were indentified as the highest SAFA, MUFA, PUFA for storage time 0 and 4 weeks were palmitic acid (C16: 0) 8.93%; 15.14%, oleic acid (C18: 1n9c) 3.73%; 5.01% and docosahexaenoic acid, (C22: 6n3) 6.77% ; 5.73% respectively. It indicated that the fatty acid of tuna loin were categorized good, where it was indicated by the AI, TI, h/H and polien index  for storage time 0 and 4 weeks 1.11; 0.83, 0.50; 0.69, 1.49; 1.72, and 1.49 ; 1.31 respectively.Warna merah merupakan salah satu faktor penentu kualitas ikan tuna loin. Setelah dipotong dan disimpan  ikan tuna akan mengalami perubahan warna, sehingga untuk mempertahankan warna merah pada daging ikan tuna digunakan filtered smoke. Filtered smoke juga dapat mengurangi oksidasi lemak dan mempertahankan kualitas asam lemak. Penelitian ini bertujuan untuk mempelajari komposisi asam lemak tuna loin (Thunnus albacares) yang diperlakukan dengan penyemprotan filtered smoke selama penyimpanan. Penelitian menggunakan metode eksperimen, ikan tuna loin disemprot dengan gas filtered smoke kemudian disimpan beku (-25 ºC) selama empat minggu. Pengamatan berlangsung  pada minggu ke-0 dan minggu ke-4 . Variabel mutu yang diuji adalah profil asam lemak, indeks atherogenic (AI), indeks thrombogenic (TI), kualitas lemak (h/H) dan  indeks poliena. Hasil analisis diperoleh asam lemak sebanyak 29  jenis terdiri dari asam lemak jenuh (SFA) 13, asam lemak tak jenuh tunggal (MUFA) 6 dan asam lemak tak jenuh jamak (PUFA) 13. SAFA tertinggi adalah asam palmitat (C16:0), sebesar 8,93% dan 15,14%, MUFA tertinggi adalah asam oleat (C18:1n9c) sebesar 3,73% dan 5,01% dan PUFA tertinggi adalah asam dokosaheksaenoat (C22:6n3) sebesar  6,77% dan 5,73%, masing-masing untuk minggu ke 0 dan minggu ke 4. Kualitas lemak ikan tuna masih tergolong baik setelah disimpan selama empat minggu, dengan nilai AI  0,83, nilai TI 0,69, nilai h/H 1,72 dan nilai indeks polien 1,31