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METANA

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Published by Universitas Diponegoro

ISSN : - EISSN : - DOI : -

Core Subject : Science,

Computer Science & IT

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Articles 6 Documents

Search results for , issue "Vol 6, No 02 (2010): Desember 2010" : 6 Documents clear

PENGGUNAAN MEMBRAN ULTRAFILTRASI DALAM PEMBUATAN SARI BUAH RAMBUTAN JOS, BAKTI; Susanto, Heru; Kuntolaksono, Satrio; Ariyanto, Yanuar
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Abstract Â Hairy fruit (Nephelium sp) is fruit of horticultural belong in family Sapindacaeae. Membrane is a thin layer separates two phases which allow the displacement of specific components and hold other components that do not being needed. Ultrafiltration is a filtration process using membranes that filter out particles with a size of 20 to 1000 Angstrom. Results of ultrafiltration has high purity (0.4 to 0.6 NTU turbidity) than results from conventional manner (1.5-3 NTU turbidity). Yield gained was 5-8% higher than that gained from conventional. Dependent variable used is kind of hairy fruits (crops and cans). The independent variable is the pressure 2 kg/cm2, 3 kg/cm2, 0.4 kg/cm2, 0.5 kg/cm2, 0.6 kg/cm2 and the type of membrane (PES and hydrosart). The result of the study showed that greater operation pressure resulted in greater turbidity, and greater flux. The greater flux resulted smaller selectivity and pass the requirement of Environmental Protection Agency, USA. Â Key word : Hairy fruits, juice, membrane, ultrafiltration

PENGEMBANGAN PROSES ENZIMATIS GELOMBANG MIKRO UNTUK PRODUKSI ASAM LEMAK DARI BUAH SAWIT SECARA IN SITU Yulianto, Mohammad Endy; Abidin, Zainal; S, FS Nugraheni; Paramita, Vita
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Abstract Vegetable oil is one of plantation commodity and used as food source and oleochemical. One of the connection between vegetable industry and oleochemical industry is the conversion of vegetable oil into fatty acid. Indonesia is one of major producer of Crude Palm Oil (CPO), Palm Kernel Oil (PKO) and Cocos Nucifera Oil (CNO), but Indonesia is also import fatty acid in the application of paint, plastics, cosmetics, detergent and soap industry. These facts show a pityfull condition of vegetable oil industry. Therefore, it is neccesary to take an effort in order to fulfill our domestic demand of fatty acid. Up to now, the fatty acid is produce by converting CPO into fatty acid, which provide high cost production due to the expensive process of CPO production. An alternative process was proposed by cutting the two stages of fatty acid production into one stage. This stage covered the direct enzymatics production of fatty acid from fresh fruit of palm oil. The lipase of palm oil is inactivated in a microwave based-enzymatics hydrolysis bioeractor. The research objectives was developing the fatty acid production through microwave biochemical process by activate the lipase enzyme of the fresh fruit of palm oil. The parameters examined were including pH, ratio of water-fruit, and the milling of the palm oil as time function. The lipase activity as a result of microwave tunning up process was increasing along with the increasing of the reaction temperature. Without the addition of buffer, the acidity of the system decreased along with the production of fatty acid. Along with the increasing of the water concentration, the fatty acid produced was also increased. Â Key Words: fatty acid, lipase, microwave

MIKROALGA SEBAGAI SUMBER BIOMASA TERBARUKAN: TEKNIK KULTIVASI DAN PEMANENAN Ariyanti, Dessy; Handayani, Noer Abyor
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Abstract Â For millennia, aquatic environment has been a source of food, minerals, and natural products to fulfill humanâ€™s need. In order to resolved problem due to increment of population, the development of product microalgae based which is one of renewable resource absolutely needed.Â Â There are two important processes in biotechnology of microalgae, microalgae cultivation and harvesting. Common cultivation methods used in growing microalgae are open raceway pond system and closed photobioreactor system. While harvesting methods used is flocculation, centrifugation and filtration. This paper described briefly the methods used in cultivation and harvesting of microalgae. Â Keywords: microalgae, cultivation, harvesting

PENGARUH ADITIF ION Cu TERHADAP MORFOLOGI KERAK GIPSUM PADA PIPA BERALIRAN LAMINER DENGAN PARAMETER LAJU ALIR Mangestiono, Wiji
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Abstract Parameter in this experimental is flowrate which has some effect on the morfology of cristals Â produced Â such Â as crystal system and crystal size. Study of morfology in this research were needed to justify what kind the crystals is and to know the effects of the adition some aditives. To fullfil this demand analysis of Scaning Electron Microscopy were done and also measurement the mass of crystals. The result of this experiment : the mass of crystals decrease by adition ion Cu2+ five ppm and 10 ppm, but crystal morfology has no difference in its siystem otherwise in its length. Crystal system still orthorhombic. Keywords : crystal, flowrate,morfology, aditive

PENGARUH ARUS DAN WAKTU PADA PELAPISAN NIKEL DENGAN ELEKTROPLATING UNTUK BENTUK PLAT Sutomo, Sutomo -; Senen, Senen -; Rahmat, Rahmat -
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

The influence of electric current and time using to coating production with electroplating machine for flat forming. Corrosion is the mainly problem of material, base on this problem researcher would like to know the influence of nickelâ€™s mass for plat coating. This research have conclusion that more time the electric current is needed will produce more thickness of coating. The current is 4 amperes and the time is 2400 seconds will produce 1.8 gr nickelâ€™s coating. Increasing current density will increase the thickness of coating, especially for using time 2400 seconds, current density 8.5 amperes/dm2. Layering rate of coating is 1.0 Î¼m/second for current density A/dm2 Key word : electroplating, electric current, time coating

PEMBUATAN MODEL INDIKATOR TEMPERATUR-WAKTU UNTUK MONITORING KUALITAS PRODUK UDANG DAN DAGING SAPI BEKU Pudjihastuti, Isti; Susanti, Margaretha Tuti
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Abstract Freezing is one way of preserving food for maintaining the quality before consumption. Frozen foods which are now circulating in the supermarket are not given yet a tool to monitor whether the food is never experienced thawing (melting) for some period. In the frozen product that has undergone uncontrolled thawing will increase microbial content rapidly at increasing temperature 10 0C. In this study the temperature-time estimator tool manufactured for frozen beef products and shrimp. This estimator tool consists of citric acid and blue litmus paper. The response will appear in blue litmus paper that changes the color becomes red when positioned at the undesired temperature. In this study, the temperature-time estimator tool is made from citric acid 1.1%, cotton and litmus paper packed in cellophane. The response is influenced by the position of estimator tool and this tool-time temperature estimator can be applied for frozen beef products and shrimp. Keywords: beef, frozen, indicators, shrimp

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