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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Riau Journal of Empowerment Unri Conference Series: Community Engagement
Syelvia Putri Utami
Department Of Chemical Engineering, Engineering Faculty, Universitas Riau
Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Mechanical Engineering Social Sciences

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Journal : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Inaktivasi Termal Spora Talaromyces Sp. Berumur 60 Hari Dalam Jus Nanas Fryda Kusumawati Khoirunnisa; Evelyn Evelyn; Syelvia Putri Utami
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Talaromyces sp. is a spore-forming fungi and has been identified as spoilage in fruit-based medium such as pineapple and tomato. The purpose of this study was to determine the effect of temperature on the thermal inactivation of Talaromyces sp. spores of 60 days in pineapple juice and determine D-value and z-value in the process of Talaromyces sp. in pineapple juice. It was shown that higher temperature resulted in the decreasing of time needed to inactivate the spores. The D-value obtained at temperatures of 80, 85, 90 °C were 67.11, 25.33, and 4.80 minutes. The following z-values were also obtained were 8,7 °C for 60 days age. The result of this study indicate the importance of temperature for the heat resistance of two-month old Talaromyces sp. spores in pineapple juice.Keywords: inactivation, pineapple, resistance, spore, talaromyces sp.
Peluruhan Batang Graphite Baterai Bekas Dengan Metode Electrochemical Expoliation Menggunakan Pelarut Asam Sulfat Dan Sodium Sulfat Untuk Produksi Graphene Azhari Harahap; Amun Amri; Syelvia Putri Utami
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Graphene is two dimensional material (2D) consisting of carbon atoms with a flat lattice configuration in a flexible hexagonal pattern. One of the materials that can be used as raw material in graphene synthesis is carbon used battery bar. The purpose of this research was to synthesize graphene using electrochemical exfoliation graphite (EEG) method and to study the process of exfoliation rate over 30, 60, 90, 120 and 150 minutes for 2.5 hours. Graphene was synthesized by using two solvents H2SO4 and Na2SO4 with varied concentrations of : 0.25 M, 0.5 M, 0.75 M and 1 M. From the synthesis results, the best exfoliation rate and the best yields were shown by Na2SO4 solvent at 1 M concentration with a yield of 21.83%. From the graphene conductivity test, the best conductivity was obtained by Na2SO4 solvent at 1 M concentration with conductivity value of 0,1698 Ω-1.cm-1.Key words : Electrochemical exfoliation graphite, graphene, graphite.
Pengaruh Konsentrasi Dan Rasio Berat Few Layer Graphene (FLG) Terhadap Sifat Mekanis Aspal Beton Jenis Asphalt Treated Base (ATB) Muhammad Sugandi; Amun Amri; Syelvia Putri Utami; Muhammad Shalahuddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Developing in highway is needed to produce better mechanical properties. This study aims to produce concrete asphalt by adding FLG (Few-Layer Graphene) from graphite, and then comparing the contribution of graphene with concentration and weight ratio of FLG to concrete asphalt as variations. Making asphalt concrete-FLG composite was started from making FLG with concentrations of 10, and 20 mg/ml using the turbulence-assisted shear exfoliation (TASE) method. Then, FLG was added to the bitumen with these variations and mixing it at 150 ᴼC and stirred for 10 minutes for homogenize. The homogenized asphalt bitumen was then mixed with the aggregates that have been prepared using a filter analyzer. The united bitumen and aggregates were then compacted using Marshall Automatic Compactor (MAC) with the number of collisions as much as 112 times and soaked in a water bath for 24 hours at 25 ᴼC. After 24 hours, the Marshall object test was weighed and soaked again for 30 minutes at 60 ᴼC before Marshall’s test. The results showed that for bitumen asphalt, the best penetration was exhibited by sample synthesized using FLG with concentrations of 20 mg/ml and 9% wt, namely 48.1 dmm. For Marshall’s test, the best flow value was also exhibited by the sample with FLG concentrations of 20 mg/ml and 9% wt, namely 4.3 mm. FTIR testing showed that there was an interaction between the FLG and bitumen in the double bond region and single bond stretch.Keywords : asphalt, few-layer graphene, flow, penetrations, softening point, stability
Pengaruh pH Pada Proses Hidrolisis Mikro Alga Chlorella Vulgaris Menjadi Glukosa Menggunakan Enzim Selulase Windy Odelia Putri; Amun Amri; Syelvia Putri Utami
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Microalgae is one of the organisms can be considered as ideal and potential raw material for production of biofuels. Chlorella Vulgaris is a group of green algae that have prospect to be developed. The purpose of this research was to find the effect of pH to enzymatic hydrolysis and obtain the optimum glucose concentration on enzymatic hydrolysis on microalgae Chlorella Vulgaris. Hydrolysis was performed with the variated the conditions of pH was 5, 6, and 7 respectively. Microalgae Chlorella vulgaris was diluted using buffer citrat acid and then mixed with cellulase enzyme. Hydrolysis process was carried out for 48 hours at 100 rpm agitation. Result of experiment was tested by using spectrofotometry UV-VIS. The results showed that the increasing of pH will increased the glucose concentration until optimum condition. The optimum glucose concentration was5,35g/L at pH 6.Keyword: cellulase, chlorella vulgaris, enzymatic, glucose, pH.
Co-Authors Amun Amri Azhari Harahap Bahruddin Bahruddin Bahruddin Chairul Chairul Chairul Chairul Deasy Rahmayuni Deni Afrika Dewi Maya Sari Dewi Sunarti Edy Saputra Evelyn Evelyn Evelyn Evelyn Fajrina Qaishum Fauzia Mulyana Fryda Kusumawati Khoirunnisa Futhanul Wewe Gilda Miranda Hamsyah Adhari Heri Rahmana Jhon Armedi Pinem Karim Abdullah Komalasari Komalasari Komalasari Komalasari Muhammad Furqan, Muhammad Muhammad Rivai Muhammad Shalahuddin Muhammad Sugandi Nor Aisha Saidina Amin Novia Azzahra Novriyani, Vivi Pebriansyah Putra Priscilla Vidya Merarin Rifati Hanifa Sri Rezeki Muria Wahyu Hidayat Windy Odelia Putri Yasminto, Habib Maulana Yusnimar Sahan Yusnimar Yusnimar