cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
INDONESIA
METANA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Computer Science & IT
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 16, No 1 (2020): Juni 2020" : 6 Documents clear
Pengaruh Blanching terhadap Karakteristik Daun Ubi Kayu Instan Kamsiati, Elmi; Rahayu, Eka; Herawati, Heny
METANA Vol 16, No 1 (2020): Juni 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (380.15 KB) | DOI: 10.14710/metana.v16i1.30461

Abstract

Daun ubikayu merupakan salah satu jenis sayuran yang memiliki kandungan gizi cukup lengkap. Selain vitamin dan mineral, daun ubikayu juga mengandung protein tinggi. Namun, karena memiliki kandungan air tinggi daun ubikayu rentan terhadap kerusakan sehingga tidak dapat disimpan dalam waktu lama. Teknologi pengeringan merupakan salah satu metode pengolahan yang dapat meningkatkan umur simpan sayuran. Penelitian ini bertujuan untuk mengetahui pengaruh jenis garam (NaCl dan natrium bikarbonat) dan lama blanching terhadap karakteristik daun ubikayu instan serta menentukan perlakuan untuk menghasilkan daun singkong instan dengan karakteristik terbaik. Hasil penelitian menunjukkan jenis garam dan lama blanching berpengaruh terhadap warna daun kering sebelum dan setelah rehidrasi, tekstur, serta daya rehidrasi. Daun ubikayu instan terbaik diperoleh dari perlakuan penggunaan NaCl 1% dengan lama blanching 15 detik. Karakteristik warna daun sebelum rehidrasi L 47,19; a -4,52; b 8,15 dan setelah rehidrasi L 36,40; a -6,97; b 13,84 dengan daya rehidrasi 760%, tekstur 11,5 g, kadar air 8,38%, kadar abu 8,56%, lemak 5,17%, protein 36,68%, dan karbohidrat 41,21%. Hasil uji statistik menunjukkan bahwa karakteristik daun ubikayu yang dihasilkan tidak berbeda nyata dengan kontrol ditinjau dari parameter proksimat, namun berbeda nyata ditinjau dari parameter kecerahan warna, daya rehidrasi, dan nilai b setelah rehidrasi.
Penambahan Gliserol terhadap Karakteristik Bioplastik dari Komposit Pati Aren dan Glukomanan Purnavita, Sari; Subandriyo, Dyionisius Yoga; Anggraeni, Ayu
METANA Vol 16, No 1 (2020): Juni 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.382 KB) | DOI: 10.14710/metana.v16i1.29977

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh rasio glukomanan dan pati aren dengan penambahan gliserol terhadap karakteristik bioplastik yang dihasilkan. Pembuatan bioplastik dilakukan dengan mencampurkan larutan glukomanan dan larutan pati aren, selanjutnya dilakukan penambahan gliserol dan poli vinil alkohol. Campuran tersebut dipanaskan pada suhu 80°C selama 20 menit, hasil pencampuran kemudian dimasukkan cetakan dan dikeringkan dengan oven hingga menjadi lembaran, Selanjutnya bioplastik tersebut diuji karakteristiknya yang meliputi ketahanan air, tensile strength dan tensile elongation. Rasio glukomanan terhadap pati aren yaitu 1:0,5 ; 1:1 ; 1:1,5 ; dan 1:2 Serta jumlah penambahan gliserol yaitu : 0 ml dan 10 ml. Hasil penelitian menunjukkan bahwa berbagai rasio glukomanan dan pati aren dengan penambahan gliserol berpengaruh terhadap karakteristik bioplastik. Pada penambahan gliserol 0 ml (tanpa gliserol), komposit bioplastik dengan perbandingan glukomanan : pati aren sebesar 1:1 menghasilkan nilai ketahanan terhadap air yang tertinggi , nilai tensile strength yang cukup tinggi, dan morfologi yang baik, tetapi nilai tensile elongation rendah. Sedangkan pada percobaan dengan penambahan gliserol 10 ml, komposit bioplastik dengan perbandingan glukomanan : pati aren sebesar 1:1 menghasilkan nilai tensile elongatiom yang tertinggi, morfologi bagus tetapi nilai tensile strength dan ketahanan airnya rendah. Aim of this research to determine the effect of glucomannan ratio and sugar palm starch with the addition of glycerol to the bioplastic characteristics. Making of bioplastics by mixing glucomannan solution and sugar palm starch solution, then addition of glycerol and polyvinyl alcohol. The mixture is heated at 80° C for 20 minutes, the result of mixing afer that put into a mold and dried in the oven until it becomes a sheet. After that, the characteristics of the bioplastics were tested which included water resistance, tensile strength and tensile elongation. The ratio of glucomannan to sugar palm starch is 1:0.5; 1:1; 1:1,5; and 1:2 And the amount of glycerol addition are: 0 ml and 10 ml. The results showed that the ratio of sugar palm starch and glucomannan with the addition of glycerol affected the bioplastic characteristics. At the addition of glycerol 0 ml, bioplastic composites with glucomane: palm starch ratio of 1:1 produce the highest water resistance value, high tensile strength value, and good morfology but low tensile elongation value. Whereas in experiments with the addition of 10 ml of glycerol, bioplastic composites with a glucomane: palm starch ratio of 1:1 produced the highest tensile elongatiom value and good morfology result but the value of tensile strength and water resistance was low
Proses Pembuatan Minyak Kelapa Murni dengan Menggunakan Rhizopus Oligosporus Moehady, Bintang Iwhan; Hidayatulloh, Irwan
METANA Vol 16, No 1 (2020): Juni 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (278.604 KB) | DOI: 10.14710/metana.v16i1.25948

Abstract

Minyak kelapa murni merupakan bahan makanan yang banyak digunakan sebagai bahan konsumsi dan bahan tambahan untuk proses industri. Minyak kelapa murni diproduksi dari bahan baku krim santan yang merupakan hasil pelindihan antara air dengan buah kelapa. Pemecahan emulsi pada santan menggunakan teknik ekstraksi kering (dry extraction) dan teknik ekstraksi basah (wet extraction). Penelitian yang dilakukan menggunakan proses ekstraksi basah, yaitu secara fermentasi menggunakan inokulum padat berupa mikroba atau ragi yang dikembangkan pada media padat. Proses tersebut dipilih untuk menyesuaikan dengan situasi masyarakat daerah di Indonesia yang banyak menghasilkan kelapa serta menyesuaikan dengan keberadaan ragi tempe yang telah memasyarakat. Tujuan penelitian ini adalah untuk mendapatkan minyak kelapa dari bahan baku santan (coconut milk) dengan menggunakan inokulum ragi tempe yang mengandung Rhizopus oligosporus. Hasil minyak kelapa murni akan dianalisa parameternya berdasarkan Standar Nasional Indonesia. Dari data percobaan di peroleh hasil analisa produk minyak kelapa murni yang paling optimum sesuai dengan SNI adalah percobaan pada variasi jumlah ragi tempe 0.5 gram dengan jumlah minyak yang dihasilkan 91.35 gram dan nilai kekeruhan 1,8 NTU. Hasil analisis kimia dan fisik: Indeks bias: 1,451, Kadar air: 0,3%, Kadar kotoran: 0,023%, Kadar bebas asam lemak: 0,96%, Kadar minyak Pelikan: 1,82%, angka saponifikasi: 262,969 mgKOH / g lemak. Virgin coconut oil is a food ingredient that is widely used as a consumption material and as an additive for industrial processes. The oil produced from coconut milk cream which was the result of leaching between water and coconut. The emulsion in coconut milk then broken by dry extraction method and wet extraction method. In this research the method carried out by a wet extraction process, which used fermentation using microbes or yeast that was developed on solid media. This process was chosen to adapt to the Indonesian people who produced ton coconut each year and in the same time, the tempeh yeast that has been popular in Indonesia. The purpose of this study was to obtain virgin coconut oil from coconut milk using yeast inoculum containing Rhizopus oligosporus. The parameters of virgin coconut oil analyzed based on the Indonesian National Standard (SNI). The experimental data obtained from the results of the most optimal analysis of virgin coconut oil in accordance with SNI experiments on the variation of the amount of tempeh yeast 0.5 grams with the amount of oil produced 91.35 grams and turbidity value 1.8 NTU. Chemical and physical analysis results: Refractive index: 1,451, Air content: 0,3%, Dirt content: 0,023%, Free fatty acid level: 0,96%, Pelicans oil content: 1,82%, saponification rate: 262,969 mg KOH /g fat.
Dampak Lingkungan dan Kesehatan Pemanfaatan Limbah Cat Sebagai Produk Material Bangunan Citra, Ari Dina Permana; Iswandari, Hargianti Dini
METANA Vol 16, No 1 (2020): Juni 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (374.045 KB) | DOI: 10.14710/metana.v16i1.30364

Abstract

Limbah cat yang tidak mempunyai nilai ekonomis dan memerlukan biaya untuk pengolahannya, dapat dimanfaatkan sebagai bahan baku menjadi produk yang berguna. Limbah cat digunakan sebagai bahan baku campuran pembuatan produk bata beton (paving block) agar dapat mencegah dampak negative lingkungan. Penelitian yang dilakukan bertujuan untuk mengkaji dampak lingkungan dan kesehatan dari limbah cat dan pemanfaatannya sebagai campuran bata beton.  Dampak lingkungan sebagai ekotoksisitas dan dampak kesehatan berupa toksisitas dihitung menggunakan perangkat kajian daur hidup LCA (Life Cycle Assessment) pada variasi kadar limbah cat sebesar 1,2,3,4 dan 5% pada bata beton. Hasil kajian menunjukkan penurunan potensi dampak lingkungan dan kesehatan produk bata beton dibandingkan limbah cat padat. Ekotoksisitas limbah cat terendah pada media tanah dan tertinggi pada media perairan air tawar. Toksisitas pada manusia jauh lebih tinggi dibanding pada media lingkungan, dipakai sebagai dasar penanganan limbah cat. Pemanfaatan limbah cat sebagai bahan baku campuran bata beton dapat mengurangi ekotoksisitas dan toksisitas secara signifikan, dapat digunakan sebagai model pengelolaan limbah. Paint waste that has no economic value and requires a cost for its processing can be used as raw material to become a useful product. Waste paint is used as a raw material for the manufacture of concrete brick products (paving blocks) in order to prevent negative environmental impacts. The research carried out aims to assess the environmental and health impacts of paint waste and its use as a concrete brick mixture. Environmental impacts as ecotoxicity and health impacts in the form of toxicity are calculated using the LCA (Life Cycle Assessment) life cycle assessment tool on the variation of paint waste content of 1,2,3,4 and 5% in concrete bricks. The results of the study show a decrease in the potential environmental and health impacts of concrete brick products compared to solid paint waste. The lowest paint waste ecotoxicity in soil media and highest in freshwater waters media. Toxicity in humans is much higher than in environmental media, used as a basis for handling paint waste. The use of paint waste as raw material for concrete brick mix can significantly reduce the ecotoxicity and toxicity, it can be used as a waste management model.
Chemical Structure of Mangrove Species Rhizophora stylosa as Natural Dyes Paryanto, Paryanto; Pranolo, Sunu Herwi; Susanti, Ari Diana; Dewi, Kristina Ratna; Rossari, Meydiana
METANA Vol 16, No 1 (2020): Juni 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.973 KB) | DOI: 10.14710/metana.v16i1.30417

Abstract

Textile dyes are divided into two types, natural dyes and synthetic dyes. Natural dyes commonly made from extraction. Extraction is a process in which one or more components are separated selectively from a liquid or solid mixture, the feed, by means of a liquid immiscible solvent. Extraction can be classified into two group, liquid extraction and solid-liquid extraction. Solvents that are usually used in the extraction of natural dyes are aquades and ethanol. The purpose of this research was to determine the chemical structure, especially tannin in natural dyes from mangrove species Rhizophora stylosa through several samples testing natural dyes. Rhizophora stylosa that have been extracted and evaporated will conducted several tests to obtain chemical structures in natural dyes and yield of tannin in natural dyes. Tests carried out include testing FT-IR, and HPLC. Based on FT-IR analysis, the extraction of Rhizophora stylosa containing tannin indicated by the presence of hydroxyl (O-H) in the area of 3385.36 cm-1, aromatic (C-H) in the area of 1365.53 cm-1, carbonyl (C=O) in the area 1646.36 cm-1, esters (C-O) in the area 1217.30 cm-1. While tannin content obtained from the analysis of HPLC were 6.087 ppm. 
Effect of The Ratio of H-Zeolite Catalyst and Temperature in The Opening Ring Reaction in Bio Lube Base Oil Production from Palm Oil Izzan, Abdillah Iman; Octaviani, Ary; Purwanto, Purwanto
METANA Vol 16, No 1 (2020): Juni 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (389.445 KB) | DOI: 10.14710/metana.v16i1.30363

Abstract

Lubricants are materials that can reduce friction between two components. Lubricants are very important to keep the engine from being damaged quickly. Currently lubricants on the market generally comes from petroleum derivatives with limited availability. Therefore, technology needs to be developed to look for other raw materials as a substitute for petroleum based lubricating oil, namely by utilizing the potential of existing vegetable oils, one of which is palm oil. Biolubricant made from palm oil will be made using the method of transesterification, epoxidation and ring opening reaction. To increase yield and high product quality, a catalyst in the form of H-Zeolite is used. So that this study aims to determine the effect of the ratio of H-Zeolite catalyst to ring opening reactions. The quality of lube base oil could be indicated from density, viscosity index and acid number. Acid number will smaller in presence higher content in 10% weight ratio of H-Zeolite as catalyst and EPOME also higher temperature of ring-opening reaction because the catalyst H-Zeolit will work more effective in temperature 75oC. Other evidence is of density and viscosity index would show good value than smaller amount of H-Zeolit and lower temperature of reaction. Advices for the future research are the purification needs to be done not only physically but also chemically to maximize the results obtained. Preferably on the reaction of opening the epoxides rings used a long chain alcohol compounds that have a high viscosity and boiling point to obtain a better viscosities value

Page 1 of 1 | Total Record : 6

 1 

Filter by Year

2020 2020


Reset
Filter By Issues
All Issue Vol 21, No 1 (2025): Juni 2025 Vol 20, No 2 (2024): Desember 2024 Vol 20, No 1 (2024): Juni 2024 Vol 19, No 2 (2023): Desember 2023 Vol 19, No 1 (2023): Juni 2023 Vol 18, No 2 (2022): Desember 2022 Vol 18, No 1 (2022): Juni 2022 Vol 17, No 2 (2021): Desember 2021 Vol 17, No 1 (2021): Juni 2021 Vol 16, No 2 (2020): Desember 2020 Vol 16, No 1 (2020): Juni 2020 Vol 15, No 2 (2019): Desember 2019 Vol 15, No 1 (2019): Juni 2019 Vol 14, No 2 (2018): Desember 2018 Vol 14, No 1 (2018): Juni 2018 Vol 13, No 2 (2017): Desember 2017 Vol 13, No 1 (2017): Juni 2017 Vol 12, No 2 (2016): Desember 2016 Vol 12, No 1 (2016): Juni 2016 Vol 11, No 02 (2015): Desember 2015 Vol 11, No 01 (2015): Juli 2015 Vol 10, No 02 (2014): Desember 2014 Vol 10, No 01 (2014): Juli 2014 Vol 9, No 02 (2013): Desember 2013 Vol 9, No 01 (2013): Juli 2013 Vol 8, No 02 (2012): Desember 2012 Vol 8, No 01 (2012): Juli 2012 Vol 6, No 01 (2009): April 2009 Vol 7, No 01 (2011): Juli 2011 Edisi Khusus Februari 2011 Vol 6, No 02 (2010): Desember 2010 Vol 6, No 02 (2009): Desember 2009 Vol 5, No 2 (2007): Desember 2007 Vol 4, No 1 (2007): Juni 2007 Vol 3, No 2 (2006): Juli 2006 Vol 1, No 2 (2004): Desember 2004 More Issue