Judul: Pengemasan atmosfer termodifikasi pada jamur merang (Volvariella volvacea) blansir
Abstrak: Straw mushroom has a shelf life of 12 hours if left at room condition. This condition can be fixed by modified atmosphere packaging (MAP) application. The aim of this research was to obtain the best package design for modified atmosphere packaging of blanching straw mushroom. Before packaging, mushrooms treated blanching using hot water that serves to reduce the possibility of oxidation reactions. The addition of preservative aims to slow and inhibit the browning process of destructive microorganism, slow down, cover up or withhold the process of fermentation, putrefaction, acidification or other decomposition of destructive microorganism. Design of the package consisted of package size, number of perforation, and diameter of perforation. This research was also aimed to determine the best storage temperature. The parameters that observed during storage time were weight decrease, hardness, whiteness level, and the level of distortion. Each treatment had different perforation number and storage temperature. Perforation number that observered were 2, 4 and 8. Perforation diameter that used was 5 mm. While storage temperature that used were 5°C, 15°C, and 25°C. Each treatment made to twice repetition and stored for 14 days. The analysis done every 2 days. Every broken sample was not physically analyzed. During storage time weight, hardness, color, and quality decrease of straw mushroom is had happened thoroughly. Each package treatment had different effect on measured parameter. The result showed that package design of polypropylene plastic bag with 4 perforations and 5 mm perforation diameter that storaged in 15°C temperature was the best design to pack fresh straw mushroom. This package design was able to maintain mushroom quality for 10 days long, whereas other treatments were only able to maintain mushroom quality less than 10 days long. That package design was able to create optimum atmosphere compotition to pack mushroom so metabolism rate could be suppressed. Else, low storaging temperature could also suppressed metabolism rate as well as inhibited the growth of destructive microorganism. The result of mushroom measuring in that package at 10th day were weight decrease of 19:22%, hardness of 12.53 mm, whiteness level of 68.9, the level of damage by 38.49%. The damage indication that suffered by straw mushroom so it unable to consume were mushroom changed in color to brown, flabby and had decomposed smell.
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Judul: Kajian Pengaruh Konsentrasi Larutan Natrium Metabisulfit dan Suhu Blansir terhadap Mutu Produk Kering Jamur Merang (Volvariella volvaceae)
Abstrak: Jamur merang (Volvariella volvaceae) merupakan jenis sayuran dengan nilai ekonomis tinggi dibandingkan sayuran domestik lainnya. Harga jamur merang di pasaran untuk saat ini mencapai 4000-4500 rupiah per kilogram. Kandungan gizi jamur merang tergolong tinggi, serta memiliki cita rasa yang khas. Dalam keadaan segar, jamur merang hanya dapat disimpan selama 24 jam, kemudian jamur merang segar akan mengalami pembusukan. Untuk itu diperlukan pengawetan. Salah satu cara pengawetan adalah dengan pengeringan. Pengeringan menggunakan aliran udara panas merupakan cara yang cukup mudah untuk diterapkan. Masalah yang sering dijumpai pada produk pangan awetan adalah mutu kurang baik, diantaranya terjadi penurunan kandungan gizi yang sangat drastis. Untuk mendapatkan produk kering dengan mutu yang baik, diperlukan perlakuan pendahuluan sebelum bahan dikeringkan. Perlakuan pendahuluan dititikberatkan pada proses sulfitasi dan blansir.
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Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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