Ayam broiler (Gallus domesticus) merupakan jenis ternak yang banyak dikembangkan sebagai sumber pemenuhan kebutuhan protein hewani. Namun, karena merupakan bahan segar dan memiliki kandungan air yang tinggi, daging ayam broiler rentan terhadap kebusukan yang disebabkan oleh mikroba. Perlakuan dengan ozon dan suhu penyimpanan mampu mempertahankan kualitas daging ayam ditinjau dari kualitas fisika, kimia, dan sensoris. Penelitian ini bertujuan untuk mengetahui pengaruh perlakuan ozonisasi dan suhu penyimpanan terhadap sifat fisika, kimia, dan sensoris daging ayam broiler. Variasi waktu perendaman, yaitu 5, 10, dan 15 menit, sedangkan untuk variasi penyimpanan yaitu 10°C dan -6°C. Penelitian ini dilakukan menggunakan Rancangan Acak Lengkap Faktorial (RALF) dan analisis lanjutan menggunakan DMRT. Hasil yang didapatkan adalah perlakuan ozon dan suhu beku efektif dalam mengurangi nilai drip loss namun meningkatkan susut masak, menurunkan atribut warna, mengurangi nilai aw, mempertahankan nilai pH, mempertahankan laju kenaikan TBARS dan TVB-N mempertahankan nilai kesukaan konsumen. Perlakuan paling efektif untuk daging ayam yaitu dengan perendaman selama 15 menit dan penyimpanan dengan suhu -6°C mampu mempertahankan drip loss, aw, pH, TBARS, TVB-N, dan sensoris dari daging ayam.
Corrosion is a decrease in the quality of a metal material caused by a reaction with the environment. Reducing the corrosion rate on steel can be done by adding an inhibitor. Papaya leaf extract (Carica papaya.L) can be used as a corrosion inhibitor by immersion method. The effect of inhibitor on corrosion rate had been studied using weight loss method, potentiodynamic polarization method, and observation of steel surface using photooptic. It was found that corrosion rate decrease with increase concentration of papaya leaves extract. The highest inhibiton efficiency is 87.8% in 0.2 M hydrochloric acid with 2% concentration of papaya leaves extract. Potentiodynamic polarization method showed that papaya leaves extract decrease corrotion current. Inhibiton efficiency reached 81.58% in 2% extract concentration in which corrosion current decrease from 0.0266 mA/cm2 to 0.0049 mA/cm2. Analysis of photooptic showed that there is difference on steel surface corroded in hydrochloric acid with inhibitor and without it.
In this study, a comparison of the attenuation value of single mode aerial cable with pigtail is made. Perform several types of connections using a 4 cm and 6 cm protection sleeve, with one and two connections and use a barrel adapter connector. How does the connection affect the installation of a 1:2 passive splitter device. The measuring instruments used for the measurement process are Optical Power Meter (OPM) and Optical Time Domain Reflectometer (OTDR). The attenuation value of aerial single mode optical cable is smaller than that of pigtail cable. The measurement results using OPM at a wavelength of 1310 nm, connection using a 4 cm protection sleeve, one connection, the attenuation value is 0.18525dB, this value is smaller than the pigtail cable, which is 1.2728 dB. In the installation of a passive splitter, the attenuation value on the aerial cable is smaller, namely 0.2081 dB compared to the pigtail cable, which is 4.3281. The measurement results using the OTDR obtained the connection loss value for the connection type using a 6 cm protection sleeve, one connection is smaller with a value of 0.155 dB, compared to the connection type using an adapter barrel with a value of 12,216 dB.
Styrofoam is a petroleum-based and synthetic polymer that is only used once. To reduce waste and environmental damage as well as health problems, this study aims to make biofoam from cassava peel and angsana leaves using a combination of extrusion and baking methods. In this study, glycerin and polyvinyl alcohol were also added with volume variations, 10: 30 (sample 1), 20 : 20 (sample 2), and 30: 10 (sample 3) mL to improve the physical properties of biofoam. The physical characteristics observed were color, water content using the gravimetric method, and water absorption capacity of ABNT NBR NM ISO 535. Sample 1 and sample 2 were lighter in color than sample 3. The lowest water content value was found in sample 2, while sample 2 was has the ability to absorb less water is sample 3.
<p class="E-JOURNALAbstractBody">Plastik sintetik diketahui sulit terurai tetapi penggunaanya semakin meningkat. Beberapa upaya telah dilakukan seperti pembakaran, daur ulang hingga penimbunan di <em>storage</em> khusus. Saat ini banyak peneliti mencari alternatif bahan dasar pembuatan plastik, salah satunya adalah <em>Po</em><em>ly Lactic Acid</em> (PLA). PLA merupakan material bioplastik yang tersusun dari monomer-monomer asam laktat dari hasil reaksi kondensasi langsung. Sifat PLA yang hidrofilik membuat bioplastik membutuhkan <em>plasticizer </em>sebagai komponen penyusun agar lebih kuat. <em>Platicizer</em> yang aman dan ramah lingkungan salah satunya Poli Etilen Glikol 400 (PEG 400). PEG 400 mampu memperbaiki kekuatan mekanik yang lebih stabil sehingga banyak digunakan dalam industri farmasi, kosmetik bahkan pangan. Tujuan penelitian ini untuk mengetahui pengaruh lama waktu pengadukan terhadap proses poliblend dengan indikator pengukuran densitas, viskositas dan kadar air larutan campuran. PLA/PEG-400 memiliki nilai densitas tertinggi sebesar 1,272 g/mL yaitu pada pengadukan menit ke-30. Sedangkab, nilai viskositas dan kadar air tertinggi diperoleh pada PLA/PEG-400 pada pengadukan menit ke-50 sebesar 212 cm<sup>2</sup>/det dan<strong> </strong>53,821%.</p>
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