https://igtj.ub.ac.id/index.php/igtj <p>The Indonesian Green Technology Journal (IGTJ) is a bilingual journal (Indonesian, English) that publish recent development and emerging issue in both conceptual and experimental aspects of green and renewable technology (science, engineering, medicine, agriculture, information technology, fisheries, animal husbandry), and its impact in general and industrial communities. This journal is also emphasising the significance of green technology development, implementation, challenge, opportunity, and acceptance in Indonesian perspective. IGTJ is publicly opens for publication of review paper, short communication, and research paper.</p> Postgraduate School Universitas Brawijaya en-US The Indonesian Green Technology Journal 2355-4010 <p>Authors who publish in this journal agree to the following terms: </p> <ol> <li>Authors retain copyright and grant the journal the right of first publication with the work simultaneously licensed under a <a href="http://creativecommons.org/licenses/by/3.0/" target="_new">Creative Commons Attribution License</a> that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.</li> <li>Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.</li> <li>Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See <a href="http://opcit.eprints.org/oacitation-biblio.html" target="_new">The Effect of Open Access</a>).</li> <li>Once submitted, it is the corresponding author's responsibility to confirm and warrant the name included as an author of the work is true (shadow author is unacceptable) and that no conflict of interest occurred among the authors.</li> </ol> https://igtj.ub.ac.id/index.php/igtj/article/view/2002 <p>Pengolahan kayu di Indonesia menghasilkan banyak limbah serbuk kayu yang belum dioptimalkan penggunaanya. Salah satu cara untuk mengatasi hal tersebut adalah dengan mengolahnya menjadi asap cair yang dapat digunakan sebagai bahan baku pengawet ikan. Proses diawali dengan mengolah serbuk kayu dengan metode pirolisis, asap cair kemudian dimurnikan dengan destilasi, dan hasilnya dikarakterisasi dengan GCMS dan FTIR. Pengujian kualitas asap cair juga dilakukan, meliputi pengukuran pH, penentuan massa jenis, pengujian bahan terapung, penentuan kadar asam organik, penentuan transparansi dan warna. Pirolisis serbuk kayu jati sebanyak 2 kg menghasilkan 3,5 L asap cair dengan proses pirolisis pada suhu 400°C selama 4 jam. Kandungan kimiawi utama asap cair dari serbuk kayu jati antara lain asam karbamat fenil ester sebanyak 22,52%, 2-metoksi-fenol sebanyak 15,88%, 2-metil-2-siklopentanol 10,56%, tetrahidro-2-furanmetanol 8,22%, 2-metil-fenol 6,78%, dan 5-hidroksi-2-heptanon 5,53%. Asap cair yang dihasilkan berwarna kuning, transparan, nilai pH 3.12, dan nilai kadar asam organik 1,20%, memiliki massa jenis sebesar 0,9307 g/cm³ dan terdapat bahan terapung sebanyak 0,3 mg/mL sampel.</p> <p><strong>Kata kunci: </strong>serbuk gergaji kayu, asap cair, pirolisis, kandungan kimia.</p> Adelia Raihana Nabilah Firdausi Elsa Safira Dwi Saputri Nella Dwi Maulita Durrotul Akmala Muhammad Adil Maulana Copyright (c) 2022 The Indonesian Green Technology Journal 2022-12-01 2022-12-01 11 2 10.21776/ub.igtj.2022.011.02.01 https://igtj.ub.ac.id/index.php/igtj/article/view/1988 <p><em>Jatropha curcas</em> L. is one of the seed plants that have lipase activity and can work well in hydrolysis reactions and chemical synthesis. This study aims to determine lipase activity that reacts with castor oil in organic solvents. In this research, organic solvents, especially hydrophobic solvents, were used in the hydrolysis reaction to increase lipase's catalytic activity. The organic solvent used has a hydrophobicity level between 2 and 4, namely hexane. The research stages consisted of lipase isolation, lipase assay, the effect of adding metal ions assay, and analysis of the compound of castor oil. The results showed that jatropha seeds had lipase activity in crude of 0.603 U/mL and increased to 0.911 U/mL after the addition of K⁺. The result of hydrolysis and transesterification of castor oil by lipase is ricinoleic acid (4,58%) and methyl ricinoleic (11,67%), and the concentration of ricinoleic acid (17.09%) and methyl ricinoleic (60.83%) were increased after addition of K⁺. The esterification reaction produces alkyl ester compounds such as methyl palmitate, ethyl pentadecanoate, methyl linoleate, methyl oleate, and methyl stearate. The lipase isolated from jatropha seeds not only catalyzes the hydrolysis reaction but also catalyzes chemical synthesis reactions such as esterification and transesterification.</p> <p><strong>Keywords: </strong>lipase enzyme, Jatropha seeds, isolation, biocatalyst, hexane.</p> Taritsu Hazal Faradis Arie Srihardyastutie Elvina Dhiaul Iftitah Copyright (c) 2022 The Indonesian Green Technology Journal 2022-12-01 2022-12-01 11 2 10.21776/ub.igtj.2022.011.02.02 https://igtj.ub.ac.id/index.php/igtj/article/view/2003 <p>Star anise (<em>Illicium verum</em>) is widely used as a medicinal herb and spice. The extracts, essential oil and oleoresin, can be produced by hydro-distillation and steam distillation, while solvent and supercritical fluid extraction can be used to extract oleoresin. In this work, the star anise is distilled to obtain the oil, subsequently, its residue is extracted by solvent extraction to get the oleoresin. Whole and grounded star anise fruit is distilled by hydro-distillation for 8, 12, 16, 20, and 24 hours, thus the highest yield is obtained at 20 hours from grounded fruit, and the highest trans-anethole content of 68.50% is obtained at 8 hours from grounded fruit. Residue from the whole fruit-distillation process is extracted by Soxhlet extraction with three types of solvent (ethanol, diethyl ether, and n-hexane) for 6 hours. The highest yield was obtained from ethanol extraction with 1.16% yield and the highest content of trans-anethol was obtained from n-hexane fraction. One sample with the highest content of anethole from whole and grounded fruit-distilled oil and oleoresin are picked, and later they are tested to measure their antioxidant capacity by Ferric Reducing Antioxidant Power Assay (FRAP).</p> <p><strong>Keywords: </strong>Essential oil, oleoresin, star anise, trans-anethole</p> Fitri Ariadna Sodi Miranda Elvina Dhiaul Iftitah Warsito Warsito Adilatunnisa Nur Indah Berliana Fadhlih Arya Seta Copyright (c) 2022 The Indonesian Green Technology Journal 2022-12-01 2022-12-01 11 2 10.21776/ub.igtj.2022.011.02.03 https://igtj.ub.ac.id/index.php/igtj/article/view/1997 <p>Fair-trade sustainable hatcheries are designed for developing and emerging countries, such as Cameroon and Indonesia respectively so that they can use their often-generous sunshine at the service of harmonious development. These hatcheries are sustainable by their functioning exclusively from solar irradiation and nocturnal radiative emission. They are fair-trade because of their simplicity which allows them to be manufactured by many local professionals. They are developed so that the compensation in thermal losses is ensured by thermosiphon heat transfer loops thermo-regulated by bimetallic strip. These hatcheries are also designed for tropical or equatorial climatic hazards due to fine modeling of physical phenomena which can also be implemented by using a simple computer. An excellent economic return is expected.</p> <p><strong>Keywords</strong>: fair-trade sustainable hatchery; thermosiphon; bimetallic regulator; created entropy; liquid water</p> Charles Awono Onana jacques Hona Laurent-Charles Valdès Copyright (c) 2022 The Indonesian Green Technology Journal 2022-12-01 2022-12-01 11 2 10.21776/ub.igtj.2022.011.02.04 https://igtj.ub.ac.id/index.php/igtj/article/view/1985 <p>Tanaman pletekan (<em>Ruellia tuberosa</em> L.) diketahui memiliki kandungan metabolit sekunder seperti flavonoid, fitosterol, sehingga diusulkan memiliki aktivitas biologis sebagai inhibitor enzim alpha-amilase. Mikroenkapsulasi merupakan metode yang dapat melindungi serta mengontrol pelepasan senyawa aktif. Penelitian ini bertujuan untuk melakukan fabrikasi terhadap ekstrak air pletekan dengan menggunakan bahan penyalut gum Arabik dan menguji aktivitasnya sebagai inhibitor untuk enzim alpha-amilase, serta mengetahui karakter mikrokapsul ekstrak air pletekan yang dihasilkan. Mikroenkapsulasi dilakukan pada variasi pH (3, 4, 5, dan 6) dan waktu pengadukan (30, 60, 90, dan 120 menit). Kondisi optimum mikrokapsul ditentukan berdasarkan penentuan efisiensi mikroenkapsulasi. Hasil penelitian menunjukkan bahwa pH 5 merupakan kondisi optimum dengan nilai efisiensi mikroenkapsulasi sebesar 51,3%. Sedangkan waktu pengadukan 90 menit merupakan kondisi optimum dengan nilai efisiensi mikroenkapsulasi sebesar 52,7%. Uji aktivitas inhibisi enzim alpha-amilase pada mikrokapsul dilakukan pada kondisi optimum menghasilkan nilai IC₅₀ sebesar 71,61 µg/mL.. Karakterisasi menggunakan spektrofotometer FTIR menghasilkan bilangan gelombang 3401,51 cm^-1 (O-H), 1608,77 cm^-1 (C=C), dan 1081,07 cm^-1 (C-O-C) yang menandakan terbentuknya mikrokapsul ekstrak air pletekan. Sedangkan hasil karakterisasi menggunakan SEM menunjukkan bahwa permukaan mikrokapsul yang dihasilkan masih heterogeny, dengan kecenderunagn berbentuk bulat, dan menghasilkan ukuran yang beragam berkisar antara 0,933 – 3,08 µm.</p> <p><strong>Kata kunci: </strong>alpha-amilase, flavonoid, mikroenkapsulasi, pH, R. tuberosa L., waktu pengadukan</p> Firza Rajasa Gunawan Arie Srihardyastutie Anna Roosdiana Anna Safitri Copyright (c) 2022 The Indonesian Green Technology Journal 2022-12-01 2022-12-01 11 2 10.21776/ub.igtj.2022.011.02.05