Ikan bandeng merupakan salah satu bahan pangan yang hingga saat ini pemanfaatannya masih terbatas, padahal ditinjau dari nilai gizinya ikan bandeng ini tinggi akan protein dan Omega-3 dibandingkan dengan ikan-ikan yang lain. Pengolahan cookies dari ikan juga merupakan salah satu upaya penanggulangan bahan baku yang cepat mengalami pembusukan dan dapat menambah nilai guna dari bahan baku ikan, yang terlebih dahulu diolah menjadi tepung ikan. Tepung daging ikan bandeng masih belum dimanfaatkan untuk pangan, karena sampai saat ini pemanfaatannya hanya terbatas sebagai campuran tepung ikan untuk pakan ternak. Penelitian ini bertujuan untuk merumuskan model optimasi dalam membuat formulasi cookies substitusi tepung daging ikan bandeng dengan teknik pemrograman linier, untuk mengetahui kelayakan finansial produk cookies tepung daging ikan bandeng.  Dalam penelitian ini menggunakan penyelesaian Metode Simpleks. Hasil dari pemecahan model matematik, menunjukkan bahwa komposisi bahan susu bubuk penggunaannya dapat dihilangkan maupun tidak. Harga susu bubuk yang cukup mahal mengakibatkan penggunaan bahan harus dibatasi atau dihilangkan untuk meminimalkan biaya produksi cookies tepung daging ikan bandeng.

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Processing apples into products such as fruit leather is an effort to extend its shelf life, provide added value, easy to distribute, and potentially an export product, but it has an unattractive color, so it needed to combine with red dragon fruit. In addition, fruit leather has water content of 10-20%, so it has a limited shelf life. Therefore, it’s necessary to study dried fruit leather. This study aimed to determine the characteristics of dried fruit leather made from apple and dragon fruit. The experimental design used a randomized block design (RBD) with two factors, i.e. proportion of apples and red dragon fruits (75%:25%, 50%:50%, 25%:75%) and citric acid concentration (0%, 0.1%). The combination of those treatments was conducted in triplicate. Elasticity, tensile strength, L*a*b color, water content, total sugar, and vitamin C were parameters observed of the dried fruit leather. Sensory testing used a rank test of taste, color, texture, and aroma preferences. The data were analyzed by ANOVA (α=5%). If there was a difference, Duncan's test was performed. The Friedman test was used to analyze organoleptic test data. The results showed that there was an interaction between treatments on each parameter and between the treatments of the panelists' preference for the color and texture of the dried fruit leather. The characteristics of dried fruit leather have ranges of elasticity 13.00–33.00%, tensile strength 1.2–3 N, water content ranges from 1.3–5.3%, total sugar ranges from 67.30–71.70%, and vitamin C ranges from 50.00 mg/100g–94.00mg/100g. Brightness values ​​(L) range from 29.50 to 31.40, a* values ​​range from 12.9 to 17.7(red), and b* values ​​range from -8.2 to -14.8 (blue). Apple and red dragon fruit can make into dried fruit leather, which has a reddish-blue color. Keywords: apple, citric acid, dragon fruits, dried fruit leather

Wet noodle is a food product that is liked by all levels of society. The main ingredient for making wet noodle is wheat flour which must be imported from other countries. For this reason, it is necessary to look for other alternative raw materials, namely kimpul flour. Red dragon fruit can be used to increase nutritional value because it contains antioxidant and improves product appearance because it contains natural dyes. The purpose of the study was to determine the effect of the proportion of wheat and kimpul flours, as well as the concentration of dragon fruit on the quality of dragon fruit wet noodle. This study used a factorial randomized block design (RBD) with the first factor being the proportion of wheat flour and kimpul flour (T1 = 40%:60%, T2 = 50%:50% and T3 = 60%:40%) and the second factor was dragon fruit concentration (N1 = 20% and N2 = 30%) with 3 replications. The results showed that the proportion of wheat flour and kimpul flour had a significant effect on protein content, elasticity, and organoleptic tests. While the concentration of dragon fruit significantly affected the water content, carbohydrate content, elasticity, and organoleptic tests. The conclusion of this research was the treatment of T3N2 (proportion of wheat flour and kimpul flour 60%: 40% and dragon fruit concentration 30%) became the selected treatment with parameters of water content 48.51%, ash content 1.72%, protein content 6 0.04%, fat content 2.64%, carbohydrate content 41.09%, and elasticity of 0.39, and has a total preference percentage of 100% color, 96.7% aroma, 100.0% taste and 96.7% texture.