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All Journal CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Jurnal Penelitian Pendidikan IPA (JPPIPA) Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Jurnal Pengabdian Masyarakat MIPA dan Pendidikan MIPA Jurnal Saintek Lahan Kering JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Bakti Cendana: Jurnal Pengabdian Masyarakat Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Abdi Masyarakat Indonesia Jurnal Ilmiah Berkala Sains dan Terapan Kimia Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat Journal of Chemical Science and Application Jurnal Pengabdian Masyarakat Inovasi Indonesia Jati Emas (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat)
Gelyaman, Gebhardus Djugian
Prodi Kimia, Universitas Timor
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Nursing Physics Public Health Social Sciences Other

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Introduction and Use of Aloe Vera-Based Edible Coating to Improve the Quality of Cucumber Fruit in the Oemanas Farmer Group Nian Village: Pengenalan dan Penggunaan Edible Coating Berbasis Aloe Vera untuk Peningkatan Mutu Buah Timun di Kelompok Tani Oemanas Desa Nian Risna Erni Yati Adu; Marselina Theresia Djue Tea; Gebhardus Djugian Gelyaman
JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Vol. 9 No. 1 (2025): Jati Emas (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat)
Publisher : DPD Jatim Perkumpulan Dosen Indonesia Semesta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Cucumber is one of the main commodities produced by the Oemanas Farmers Group in Nian Village. So far, the number of cucumbers produced is quite high during harvest time, but often experiences physical damage during transportation and marketing. Due to the limited knowledge and skills of the farmer group members, so far there has been no post-harvest processing and preservation technique. As an effort to reduce this problem, it is necessary to carry out activities to introduce and apply edible coating based on easily accessible materials. Edible coating can control post-harvest damage to cucumbers. This community service activity aims to control damage to cucumbers in partner groups through preliminary survey activities to obtain information related to partner conditions, socialization in the form of lectures followed by interactive discussions between participants and implementers, training in preparation and application of coating suspensions carried out through demonstration activities then continued with independent practice activities by each member of the farmer group. The final activity is an evaluation to measure the achievement of the goals and targets of the activity. The evaluation results showed an increase in partner knowledge about edible coating by 65% ​​of the total participants. In addition, more than 70% of partner members have the skills to carry out the preparation of edible coating suspensions and apply them to the surface of cucumbers through dipping techniques.
Curcumin-Cellulose Film for Visual Detection of Fish Spoilage Risna Erni Yati Adu; Gebhardus Djugian Gelyaman
Jurnal Sains dan Terapan Kimia Vol 18, No 2 (2024)
Publisher : Jurnal Ilmiah Berkala Sains dan Terapan Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v18i2.15550

Abstract

Fish spoilage can be monitored visually through a responsive film to freshness and pH changes. This study aims to produce a film that is responsive to pH changes in the fish environment from curcumin, a safer natural dye. The chemical, physical, and functional characteristics as well as the film response to pH change and fish freshness during storage were studied here. Cellulose-curcumin films were fabricated by impregnation of curcumin into cellulose films. The chemical characteristics such as functional groups and surface morphology were determined by FT-IR and SEM respectively. FT-IR presents an interaction between curcumin and cellulosic polymer. The impregnation of curcumin into the cellulose film caused the segregation on the film surface observed on the SEM photos and decreased the swelling index. Cellulose-curcumin films are highly responsive to both acidic and alkaline pH. At an acidic pH, the film is yellow while at an alkaline pH the film changes to a red-brown color. The film also presented a highly color change from orange to reddish brown with increasing of fish storage days. A higher antioxidant activity of 5.54% was presented by curcumin film than the cellulose pure film. Therefore, cellulose-curcumin film can be used to detect fish spoilage through direct visual inspection.
Pemanfaatan Ekstrak Antosianin dari Limbah Kulit Bawang Merah (Allium cepa) sebagai Zat Pemeka (Sensitizer) pada Dye Sensitized Solar Cell (DSSC) Adu, Risna Erni Yati; Gelyaman, Gebhardus; Kabosu, Marlince
ALCHEMY Jurnal Penelitian Kimia Vol 18, No 1 (2022): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.18.1.56104.103-111

Abstract

Fabrikasi DSSC dengan menggunakan sensitizer zat warna sintetik yang mahal dan susah diperoleh dapat diatasi dengan memanfaatkan zat warna alami dari limbah biomassa kulit bawang merah. Penelitian tentang ekstraksi antosianin dari limbah kulit bawang merah (Allium cepa) dan pemanfaatannya sebagai zat pemeka (sensitizer) pada Dye Sensitized Solar Cell (DSSC) telah dilakukan dengan tujuan untuk mengetahui karakteristik warna ekstrak antosianin dalam limbah kulit bawang merah dan potensinya sebagai zat pemeka dalam DSSC. Antosianin dalam limbah kulit bawang merah diekstraksi dengan menggunakan pelarut etanol 95% dengan penambahan asam (ET) dan etanol tanpa penambahan asam (ETT). Ekstrak kulit bawang merah dikarakterisasi serapan warna dan gugus fungsinya dengan Spektrofotometer UV-Vis pada panjang gelombang 200 nm – 800 nm dan Fourier Transform Infrared (FTIR) pada bilangan gelombang 4000 cm-1 – 500 cm-1. Selanjutnya DSSC difabrikasi dan efisiensi DSSC ditentukan melalui perhitungan tegangan dan kuat arus yang terukur oleh multimeter. Hasil karakterisasi warna menunjukkan bahwa ekstrak kulit bawang merah baik dengan pelarut etanol terasamkan dan tidak terasamkan memiliki serapan maksimum pada panjang gelombang UV dengan serapan utama pada panjang gelombang 221, 251, 291 dan 366 nm. Spektrum FTIR ekstrak kulit bawang menunjukkan serapan khas gugus fungsi pada molekul antosianin pada rentang bilangan gelombang 3418 cm-1– 3375 cm-1 untuk gugus –OH, 2842 cm-1 – 2959 cm-1 untuk C–H alifatik, 1635 cm-1 – 1668 dan 714 cm-1 masing-masing untuk C=C dan C–H aromatic, 1040 cm-1– 1091 cm-1 untuk C–O–C dan 1198 cm-1– 1122 cm-1 untuk C–O alkohol. Hasil pengujian efisiensi sel menunjukkan bahwa sel DSSC yang difabrikasi menggunakan ekstrak etanol TT memiliki nilai efisiensi yang lebih tinggi yaitu sebesar 0,0491%.The Application of Anthocyanins Extracts from Red Onion Peel  Waste (Allium cepa) as a Sensitizer in Dye-Sensitized Solar Cell (DSSC). DSSC fabrication using synthetic dye sensitizers which are expensive and difficult to obtain can be overcome by utilizing natural dyes from onion peel. Anthocyanin extraction from red onion peel (Allium cepa) and its use as a sensitizer in dye-sensitized solar cells (DSSC) has been investigated. The purpose of this study was to determine the color characteristics of anthocyanin extract in onion peel waste and its potential as a sensitizer. Anthocyanin in onion peel waste was extracted using 95% ethanol as a solvent with acid (ET) and ethanol without acid (ETT). The color absorption and functional groups of onion peel extract were characterized using UV-Vis spectrophotometer at 200 nm – 800 nm wavelength and Fourier Transform Infrared (FTIR) at wavenumber of 4000 cm-1 – 500 cm-1. Furthermore, DSSC was fabricated, and an efficiency value was achieved by calculating the voltage and current measured by the multimeter. Onion peel extract has maximum absorption in acidified and unacidified ethanol at UV wavelengths, with the main absorption at 221, 251, 291, and 366 nm. The FTIR spectrum of onion peel extract shows typical absorption of functional groups in anthocyanin at wavenumbers of 3418 cm-1 – 3375 cm-1 for the –OH group, 2842 cm-1– 2959 cm-1 for aliphatic CH, 1635 cm-1–1668 cm-1, and 714 cm-1 for C=C and C–H aromatics, respectively. The absorption band at 1040 cm-1– 1091 cm-1 and 1198 cm-1 – 1122 cm-1 correspond to C–O–C and C–O alcohol. DSSC cells fabricated using unacidified ethanol extract have the highest efficiency of 0.0491%.
Co-Authors Agustina Mogi Aloysius Rusae Amsikan, Apriani Antonius Ola Benu, Didi Benu, Didi Prasetyo Bria, Emilia Juliyanti Christanti, Cindy Claudia Edi, Eduardus Emilia Juliyanti Bria Ernesta Wae Faustinus Kadha Fetronela Rambu Bobu Giovanny Robertho Wolfram Lake Hermina Manlea Janrigo Klamegio Mere Janrigo Klaumegio Mere Jefry Presson Jefry Presson Kabosu, Marlince Kefi, Felisitas Kia, Kristoforus Wilson Knaofmone, Angelina Kolo, Maria Magdalena Korbafo, Elisabeth Manikin, Gerosa Risa Vianey Matius Stefanus Batu Mere, Janrigo Klaumegio N. M. Obenu Nensiana Kono Foni, Elfrida Obenu, Noviana Mery Oki, Emirensiana Patrisius Maryanto Bria Regina Seran Rikardus Kolo Risna Erni Yati Adu Sefrinus Maria Dolfi Kolo Silab, Maria Desi Talan, Veronika Sofia Jaquelin Tea, Marselina Theresia Djue Tefa, Anna Wiguna, Gede Arya Yohana Ivana Kedang Yolanda Getrudis Naisumu Yoseph Satrio Akoit