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All Journal Jurnal Teknologi Pertanian Jurnal Sains dan Teknologi Pangan Indonesian Food Science and TechnologyJournal Biosaintifika: Journal of Biology & Biology Education Jurnal Teknologi & Industri Hasil Pertanian Indonesian Journal of Food Technology
Aisyah Tri Septiana
Jurusan Teknologi Pertanian, Fakultas Pertanian, UNSOED Purwokerto
Agriculture, Biological Sciences & Forestry Computer Science & IT Industrial & Manufacturing Engineering

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Journal : Jurnal Teknologi Pertanian

 1 
Antioxidan activity of Sargassum duplicatum seaweed extract Septiana, Aisyah Tri; Asnani, Ari
Jurnal Teknologi Pertanian Vol 14, No 2 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Sargassum duplicatum contains bioactive compounds that potential as antioxidants. The aims of the research were to study the antioxidant activity of S. duplicatum’s extract obtained from solvent extraction by one-step extraction and multi-step extraction methods. Solvents used were hexanes, ethyl acetate, methanol, ethanol, and water. Antioxidant activity of extract was measured by analyzing the peroxide value, malonaldehide (MDA) from linoleic acid dan 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenger capacity. The result showed that the extract of S. duplicatum could inhibit linoleic acid oxidation and scavenge free radical. Antioxidant activity on linoleic acid of methanol extract from one-step extraction method was the highest, whereas antioxidant activity of ethanol and ethyl acetate extracts was not significantly different. Methanol extract from one step extraction could inhibit peroxide formation by 86.4%, and MDA formation by 77.5%. As reference, α tocopherol inhibited peroxide formation by 89.1% and MDA formation by 60.6%. The DPPH radical scavenger capacity of all extracts of S. duplicatum was lower than α tocopherol.  Activity of antioxidant of those extracts was closely related to their total phenolic content.Key words: Extraction, antioxidant, Sargassum duplicatum
Jatropha Oil Utilization as Basic Material of Grease Lubricant Yanto, Tri; Septiana, Aisyah Tri
Jurnal Teknologi Pertanian Vol 13, No 1 (2012)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Grease is a kind of lubricant having form of semi solid to solid. It is made of three basic components: base oil, thickening agents and additives. Jatropha oil has a potential roles as a grease lubricant base oil. This research aimed to study the differences of basic material compositions towards the grease qualities, to study the thickening agent which had the most suitable for grease production and to determine the best treatment combination of grease formulation using jatropha oil. The research used an experimental method. The tested factors were types of oil consists and thickening agent consists. Physicochemical variables observed were: dropping point, pH, texture and corrosion resistance. The result of the research showed that the differences of basic material compositions gave the influence to the grease dropping point characteristics. The addition of castor oil 15% could decrease the grease dropping point (from 101.33 oC to 99.08 oC) while the addition of mineral oil lubricant 15% could increase the grease dropping point (101.33 oC to 112.58 oC). The thickening agent which had the most suitable for grease production using jatropha oil was LiOH 3.5% + Al(OH)3 0.5% produced 128.83 oC of dropping point. The best formulation based on zero-one test method obtained at treatment of M3P6, i.e. the grease which has basic materials composition of jatropha oil + mineral oil lubricant 15% and thickening agent of LiOH 0.5% + Al(OH)3 0.5%. That formulation had the characteristic 138 oC of dropping point, pH 7.5, 4.63 mm/dt of texture (NLGI grade of 3) and corrosion resistance included in group 1b (dark orange). Keywords: grease, jatropha oil, castor oil
Co-Authors Ari Asnani Arsyistawa, Hadana Sabila Budi Sustriawan Effendi, Nazmirafa Endang Sri Purwati Geisha, Rahmania Hidayah Dwiyanti Ike Sitoresmi mulyo Purbowati Indarto Indarto Isti Handayani Nuniek Ina Ratnaningtyas Nur Aini Nuraeni Ekowati, Nuraeni Prihananto, Vincentius Purnomowati Purnomowati, Purnomowati Salsabila, Muna Verentsya Santi Dwi Astuti Sitorus, Ester Mastiur Suliman, Nageeb Mohammed Supriyadi, Adi Tri Yanto Yunika Purwanti