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All Journal CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Jurnal Kimia (Journal of Chemistry) JURNAL KIMIA SAINS DAN APLIKASI Jurnal Riset Kimia Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Akta Kimia Indonesia Jurnal Saintek Lahan Kering JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Abdimas Galuh: Jurnal Pengabdian Kepada Masyarakat BERNAS: Jurnal Pengabdian Kepada Masyarakat Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Jurnal Pengabdian kepada Masyarakat Nusantara Hydrogen: Jurnal Kependidikan Kimia Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Jurnal Akademika Kimia Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat Journal of Chemical Science and Application Jurnal Akademika Kimia
Risna Erni Yati Adu
Universitas Timor
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Journal : Jurnal Saintek Lahan Kering

 1 
PEMANFAATAN ABU TONGKOL JAGUNG SEBAGAI ALTERNATIF KATALIS BASA PADA PEMBUATAN BIODIESEL DARI MINYAK JELANTAH Risna Adu
Saintek Lahan Kering Vol 3 No 1 (2020): JSLK JUNI 2020
Publisher : Fakultas Pertanian, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (222.769 KB) | DOI: 10.32938/slk.v3i1.1017

Abstract

The utilization of corncob ash as an alternative base catalyst source for biodiesel production has been studied to determine the corn cob's ash potential in transesterification proccess from waste cooking oil. Corn cob ash properties was analyzed by AAS and alkalinity test to measured potassium levels and its form. Alkaline solution was obtained by stirring corn cobs ash in methanol for 4 hours. Transesterification of waste cooking oil was carried out by varying ash amount for 5, 10, 15, and 20 g (molar ratio of methanol/oil 6:1 at 60 oC for 2 hours and stirring speed was kept constant); and methanol /oil molar ratio for 3: 1, 6: 1, 9: 1 and 12: 1 (optimum amount of ash). Methyl esters content was determined by GC-MS, while some physical and chemical properties of biodiesel were measured using the ASTM standard method. Potassium content of corncob ash was 38.76% (wt), the potassium might be presence in carbonate form. Optimum condition of biodiesel conversion was reached at the use of 10 gr corn cob ash and methanol/oil molar ratio of 6: 1. GC-MS data showed that biodiesel from waste cooking oil are methyl esters which are dominated by methyl linoleate and methyl palmitate. The quality of biodiesel products (viscosity and density) meets the requirements of biodiesel specifications according to SNI 7182-2015. Corn cobs ash can be used as an alternative basic catalyst source for biodiesel transesterification. On the other side waste cooking oil and corn cobs value can be improved by using them in the transesterification process.
Aktivitas Antibakteri dan Antioksidan Kain Tenun Timor Setelah Mordanting dengan Biomordan Tanin Kulit Biji Asam Eka Maria Sanit; Risna Erni Yati Adu; Maria Magdalena Kolo; Elisabeth Korbafo
Saintek Lahan Kering Vol 6 No 1 (2023): JSLK JUNI 2023
Publisher : Fakultas Pertanian, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/slk.v6i1.2137

Abstract

The use of natural dyes in the textile industry, especially in dyeing Timorese woven fabrics, is increasingly in demand, however, the resulting colors tend not to fade easily against washing, so mordant is needed as a binder for colors and fabric fibers. Dyes and mordant derived from natural materials, apart from functioning as coloring agent and color enhancer, also have functional activities such as antibacterial and antioxidant. This study was conducted to examine the antioxidant and antibacterial activity of Timorese weaving using curcumin and biomordan tannin dyes against the growth of Escherichia Coli and Staphylococcus Aureus bacteria. Prior to the antioxidant activity test using the DPPH method and the antibacterial test using the difussion method, a mordanting process was carried out with variations of mordant and coloring of woven fabrics. The results of the inhibition zone measurements showed that woven fabrics dyed without the application of biomordan tannins had strong antibacterial activity with an inhibition zone diameter of 2.0 mm. Meanwhile, the highest antioxidant activity was found in fabrics colored with curcumin and fixed with biomordan, which was 58.11 ppm.
Pengaruh Konsentrasi Ekstrak Kulit Bawang Merah Terhadap Aktivitas Antioksidan dan Antibakteri Detektor Kesegaran Berbasis Selulosa -Antosianin Adu, Risna Erni Yati
Saintek Lahan Kering Vol 7 No 1 (2024): JSLK JUNI 2024
Publisher : Fakultas Pertanian, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/slk.v7i1.2577

Abstract

Chicken meat spoilage during storage can be monitored and prevented using smart packaging that contains active antioxidant and antibacterial compounds. This research aims to determine the effect of shallot skin extract concentration on the antioxidant and antibacterial activity of anthocyanin cellulose films for active packaging development. The method used to test antioxidant activity was the DPPH (1,1-diphenyl-picrylhydrazyl) method, while the antibacterial activity test used the liquid diffusion method. Antioxidant activity test results showed that the cellulose-anthocyanin film has an IC50 value of 1.36 µg/mL which was classified as very strong antioxidant activity. The antibacterial activity thest showed that overall the cellulose-anthocyanin film could inhibit the growth of bacteria, both Staphylococcus aureus and Escherichia coli bacteria. Shallot skin extract can be used as anthocyanins source which have antibacterial and antioxidant activity for smart packaging development.
Co-Authors A. Kuncaka A. Kuncaka Agus Kuncaka Agus Kuncaka Amsikan, Apriani Azor Yulianus Tefa Benu, Didi Benu, Didi Prasetyo Bernadina Metboki Bria, Deseriana Christanti, Cindy Claudia Edi, Eduardus Eduardus Yosef Neonbeni Eka Maria Sanit Emilia Juliyanti Bria Fay, Angela Desy Putry Florian Mayesti Prima Remba Makin Fransiskus Yulius Dhewa Kadju Gelyaman, Gebhardus Djugian Hanas, Dicky Hanas, Dicky Frengky Heri Suseno Hermina Manlea Jefry Presson Jefry Presson Jefry Presson jefry Presson Kamaluddin Kamaluddin Kamaluddin Kefi, Felisitas Kia, Kristoforus Wilson Knaofmone, Angelina Kolo, Maria Magdalena Korbafo, Elisabeth Loe, Delviana Erwita Lourenco Pereira Soares Lukas Pardosi Makin, Florian M. P. R. Manikin, Gerosa Risa Vianey Maria Lilita Guterres Maria Magdalena Kollo Marlince Kabosu Mata, Meri Helsiana Matius Stefanus Batu Mere, Janrigo Klaumegio N. M. Obenu Natalia Desy Djata Ndua Nensiana Kono Foni, Elfrida Neonbeni, Eduardus Yosef Nugraha K. F. Dethan Oki, Emirensiana R. Roto R. Roto Regina Seran Roto Roto Roto roto Silab, Maria Desi Sipayung, Boanerges Putra Talan, Veronika Sofia Jaquelin Tea, Marselina Theresia Djue Tnunay, Ite Morina Yostianti tnunay, ite morina yostianti Wiguna, Gede Arya Wilda Lumban Tobing Yakobus Pffeferius Edvend Saba Agu Yohana Ivana Kedang Yuni Sine Yuni Sine Yunita Bouk