Judul: Evaluation of Fish Oil Production Process from Surimi Processing By-Products at Extraction Level at PT Starfood International
Abstrak: Surimi merupakan produk intermediet dari bahan baku perikanan yang menghasilkan hasil samping berupa limbah padat dan limbah cair. Limbah cair berasal dari hasil pencucian ikan pada proses pengolahan surimi. Limbah cair berpotensi mengandung lemak yang dapat diolah menjadi minyak ikan melalui serangkaian proses ekstraksi dan pemurnian. Proses ekstraksi melibatkan perlakuan wet rendering, high pressure, screw press, dan waterbath. Minyak ikan mentah yang diperoleh diuji karakteristik mutu dengan parameter yang diukur diantaranya nilai anisidine, bilangan asam, bilangan iod, bilangan peroksida, dan nilai total oksidasi. Berdasarkan pengujian tersebut diperoleh metode ekstraksi existing yaitu wet rendering masih memberikan nilai terbaik dan memenuhi standar CODEX 2021 pada parameter anisidine, peroksida, dan total oksidasi. Metode ekstraksi high pressure dengan variasi waktu 5 menit menjadi opsi metode ekstraksi lain karena memberikan nilai terbaik pada parameter bilangan asam.
Keyword: CODEX 2021, Extraction, Fish Oil

Judul: Comparative Study of Fish Oil Purification from Surimi Processing Byproducts Using Bleaching and Degumming-Bleaching Methods
Abstrak: Kualitas minyak ikan merupakan suatu parameter krusial yang perlu diperhatikan untuk mendapatkan produk dengan stabilitas oksidatif yang baik. Tahapan pemurnian merupakan sebuah upaya yang dilakukan untuk mendapatkan minyak ikan dengan kualitas yang baik dan memenuhi standar baku mutu. Proses pemurnian minyak ikan hasil samping produksi surimi dilakukan dengan menerapkan proses bleaching dan kombinasi degumming-bleaching untuk mengetahui efek pemurnian terhadap kualitas minyak ikan yang dihasilkan. Hasil pemurnian dengan metode bleaching menggunakan adsorben magnesol XL konsentrasi 5% dianggap mampu memberikan hasil yang lebih baik pada sampel minyak ikan hasil ekstraksi menggunakan metode high pressure selama 5 menit. Hasil pemurnian menunjukkan bahwa parameter bilangan asam dan nilai anisidine yang dihasilkan sudah memenuhi standar baku mutu yang ditetapkan oleh CODEX 2021., Fish oil quality is a crucial parameter that must be considered to obtain a product with good oxidative stability. The purification stage is an effort to obtain high-quality fish oil that meets quality standards. The purification process of fish oil made from surimi by-product was carried out using a bleaching process and a combination of degumming-bleaching to determine the effect of purification. The results of purification with the bleaching method using 5% Magnesol XL adsorbent are considered to be able to provide better results on fish oil samples extracted using the high pressure method for 5 minutes. The purification results showed that the acid value and anisidine value parameters produced met the quality standards set by CODEX 2021.
Keyword: Degumming, purification, bleaching, fish oil

Judul: Analysis of Spatio Temporal Dynamics Model in Malaria
Abstrak: Malaria is an infectious disease caused by protozoa of the genus Plasmodium, which is transmitted from person to another person through the bites of female Anopheles mosquitoes. Mathematical model can be used to study the spread of the disease. The mathematical model discussed in this paper is Ross- MacDonald model and models with spatial heterogeneity of migration model and visitation model. For the models of heterogeneous environments with mobility, we also made numerical simulations for different values of intensity connection between patches, values of e (the proportion of humans migrate) and T (visitation time). Stability analysis of Ross-MacDonald model give two stable equilibrium points. For the migration and visitation models, there are four stable equilibrium points. When in a fragmented environment, humans have a high migration rate between patches, the system will more rapidly reach the same equilibrium prevalence it reached with lower migration rates. When humans visit other patches, an increase in the time devoted to the visits will make the system reach a higher equilibrium prevalence more rapidly. The numerical simulation show that increasing mosquitoes mortality rate makes the number of infected humans being exposed decrease. If average bite of an infected mosquito increases, then the number of infected humans who become exposed also increases. For the mosquito population, increasing mosquitoes mortality rate will cause the number of infected mosquitoes being exposed decrease. Increasing the average bite of an infected mosquito will increase the number of infected mosquitoes that become exposed.
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