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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
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Neuroscience Nursing Public Health Social Sciences Veterinary Other

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Extraction and Application of Avocado (Persea americana Mill.) Seed Tannins as a Biomordant for Natural Dyeing of Timorese Handwoven Fabric Adu, Risna Erni Yati; Djugian Gelyaman, Gebhardus; Nensiana Kono Foni, Elfrida; Theresia Djue Tea, Marselina
Al-Kimia Vol 11 No 2 (2023): DESEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v11i2.41015

Abstract

Natural dyeing of Timorese handwoven fabrics results in less intense and less color fastness of products against washing. The use of metal mordant such as alum for color fixation is not sufficiently safe for the environment. In this study, the extracted tannin of avocado seeds was applied as an alternative mordant to increase the color fastness of natural handwoven fabrics. Tannin was extracted by maceration, qualitatively and quantitatively analyzed with UV-Vis, applied in different concentration for handwoven fabric dyeing and the color fastness value was determined using the Staining Scale Standard. The results revealed that avocado seeds contain tannins with a total tannin content of 22.75 mg/kg dry weight. The FTIR Spectra shows several specific functional groups of tannin such as C-O and -OH which are effective enough to bind dyes and fabric fibers. It was concluded that the higher the tannin concentration, the higher the color fastness of the handwoven fabrics.
Identification Chemical Compositions of Lemongrass Plant (Cymbopogon nardus L.) Dawan Tribe, Oenenu Village, North Central Timor Regency Noviana Obenu; Eduardus Edi; Risna E. Adu
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2021.v10.i2.pp93-97

Abstract

Lemongrass (Cymbopogon nardus L.) is a local natural resource used by the Dawan tribe as an alternative for mosquito repellent. The utilization of these plants cannot be separated from the content of compounds found in these plants. Therefore, it is necessary to analyze the content of bioactive compounds from lemongrass (Cymbopogon nardus L.). This research method includes sample preparation, isolation and identification of compounds, and antioxidant activity analysis. The results of this study that there were three main components of citronella oil, namely geraniol, citronellol, and citronellal, with a higher percentage of geraniol, namely 18.82%. The compounds contained in lemongrass oil have a weak antioxidant activity with IC50 681.48 mg/mL.
A Simple Analyte Volatilization in Polytetrafluoroethylene (PTFE) Vessel for Spectrophotometric Determination of Boron Risna E. Y. Adu; Roto Roto; Agus Kuncaka
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2021.v10.i2.pp98-104

Abstract

A simple analyte separation through an in-situ volatilization system in a polytetrafluoroethylene (PTFE) container was carried out for boric acid analysis in a food product by spectrophotometry. Separation was conducted in two teflon containers divided into the reagents compartment (outer vessel) and sample compartment (inner vessel). System optimization was done by varying the curcumin content and ethanol: water ratio. The optimum condition of the volatilization system was achieved at a curcumin concentration of 0.1% and ethanol: water ratio of 3:1. LOD and LOQ measurements, respectively, gave a value of 0.0413 mg/L and 0.1088 mg/L. The established method was used to determine boric acid content in sausage products by UV-Vis Spectrophotometry at 555 nm. The boric acid concentration in food samples was found to be 0.913-3.518 mg/kg. The separating method through in-situ volatilization systems in a polytetrafluoroethylene (PTFE) container can be used for boric acid analysis in food samples.
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.
INTELIGENT INDIKATOR pH BERBASIS ANTOSIANIN LIMBAH KULIT BAWANG MERAH UNTUK DETEKSI KESEGARAN UDANG Amsikan, Apriani; Adu, Risna Erni Yati; D. Gelyaman, Gebhardus
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 11 No 2 (2023): Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Publisher : Graduate Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Tingkat kesegaran udang dalam kemasan sulit terdeteksi oleh konsumen tanpa membuka kemasan, sehingga dibutuhkan pengembangan indicator visual berbasis perubahan pH. Penelitian ini bertujuan untuk menghasilkan indicator visual yang dapat mendeteksi perubahan pH akibat perubahan kesegaran udang. Indikator pH difabrikasi dari polimer selulosa dan ekstrak kulit bawang merah melalui metode solution casting. Karakteristik film ditentukan menggunakan FTIR dan SEM. Respon film diuji terhadap larutan buffer pH yang berbeda dan sampel udang selama masa penyimpanan. Hasil karakterisasi film menunjukkan adanya serapan gugus spesifik selulosa dan antosianin yaitu -OH, CH, C-O-C, C=C. Analis SEM menunjukkan bahwa film dengan ekstrak antosianin memiliki permukaan yang homogen. Film menghasilkan perubahan warna dari orange kemerahan menjadi merah kecoklatan seiring dengan perubahan pH sampel dari 7,93 sampai 10,26. Film selulosa antosianin berpotensi digunakan sebagai indikator untuk mendeteksi kesegaran udang. ABSTRACT: It is a difficult thing for consumers to detect the freshness level of packaged shrimp without opening the package, so a visual indicator based on pH changes is needed to develop. This study aims to produce a visual indicator that can detect pH changes due to changes of shrimp freshness. The pH indicator was fabricated from cellulose polymer and shallot skin extract through solution casting method. Film characteristics were determined by using FTIR and SEM. Film response was tested against different pH buffer solutions and shrimp samples during storage. The results of FTIR characterization showed specific absorption for cellulose and anthocyanin groups, namely -OH, CH, C-O-C, C=C. SEM analysis showed that the films with anthocyanin extracts had a smooth and compact surface. The film gave a color change from reddish orange to brownish red along with pH changes of sample from 7.93 to 10.26. Anthocyanin cellulose film has the potential to be used as a real-time indicator to detect shrimp freshness
PENGARUH KONSENTRASI KURKUMIN TERHADAP AKTIVITAS ANTIBAKTERI DAN ANTIOKSIDAN FILM SELULOSA KURKUMIN Loe, Delviana Erwita; Yati Adu, Risna Erni; Obenu, Noviana Mery
CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Vol 11 No 2 (2023): Cakra Kimia (Indonesian E-Journal of Applied Chemistry)
Publisher : Graduate Program of Applied Chemistry, Udayana University, Bali-INDONESIA

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Abstract

ABSTRAK: Kerusakan daging selama penyimpanan dapat dipantau dan dicegah menggunakan kemasan pintar yang mengandung senyawa aktif antioksidan dan antibakteri. Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi kurkumin terhadap aktivitas antibakteri dan antioksidan dari film selulosa kurkumin untuk pengembangan film menjadi kemasan aktif. Metode yang digunakan untuk uji aktivitas antioksidan adalah metode DPPH (1.1-difenil-2-pikrilhidrazil), sedangkan uji aktivitas antibakteri menggunakan metode difusi cakram. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi kurkumin dalam film selulosa-kurkumin meningkatkan % inhibisi sebesar 43,561%. Sedangkan hasil aktivitas antibakteri menunjukkan bahwa peningkatan konsentrasi kurkumin dalam film selulosa-kurkumin meningkatkan diameter zona hambat sebesar 11,375 mm dan 13,375 mm, masing-masing terhadap Escherichia coli dan Staphylococcus aureus. Peningkatan konsentrasi kurkumin dapat meningkatkan aktivitas antibakteri dan antioksidan dari film selulosa kurkumin. ABSTRACT: Meat damage 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 curcumin concentration on the antibacterial and antioxidant activity of curcumin cellulose films for developing films into active packaging. The method used to test antioxidant activity was the DPPH (1.1-diphenyl-2-picrylhydrazyl) method, while the antibacterial activity test used the disc diffusion method. The results showed that increasing the concentration of curcumin in the cellulose-curcumin film increased the % inhibition by 43.561%. Meanwhile, the results of antibacterial activity showed that increasing the concentration of curcumin in the cellulose-curcumin film increased the diameter of the inhibition zone by 11.375 mm and 13.375 mm, respectively against Escherichia coli and Staphylococcus aureus. Increasing the concentration of curcumin can increase the antibacterial and antioxidant activity of curcumin cellulose films.
Curcumin-Cellulose Film for Visual Detection of Fish Spoilage Adu, Risna Erni Yati; Gelyaman, Gebhardus Djugian
Jurnal Sains dan Terapan Kimia Vol 18, No 2 (2024)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

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.
Eco-Dyeing of Timor Woven Fabrics using Pterocarpus Indicus Bark Tannin as a Natural Mordant Adu, Risna Erni Yati; Fay, Angela Desy Putry; Tea, Marselina Theresia Djue
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 4 (2024): August 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i4.11640

Abstract

Pterocarpus indicus is a tropical wood type containing tannin compounds which potentially to be used as biomordants in woven fabrics dyeing. This research is the first work to determine the color cha racteristics of Timorese woven fabric after using tannin from Pterocarpus indicus bark as a biomordant. This research aims to determine the tannin content and colour properties of Timor woven fabric after using tannin as a a natural mordant. Pterocarpus indicus bark samples were prepared and extracted via hot extraction. The tannins in Pterocarpus indicus stem bark were qualitatively and quantitatively analyzed using FT-IR and UV-Vis Spectrophotometer respectively, then applied as a color binder for woven threads. The color properties of woven fabrics with tannin were compared to woven fabrics treated with Al2(SO4)3 mordant at a concentration of 15%. Color fastness to washing are tested using the Staining Scale Standard. Pterocarpus indicus bark tannin is a brown powder. Qualitative and quantitative tests show that Pterocarpus indicus bark contains tannins with a total concentration of 0.0436%. FTIR spectra exhibited functional groups absorption by the aromatic C-H, O-H, C=C, C-C, C-O-C, and C-O. The use of 15% tannin and curcumin dye produces a yellow-brown woven fabric with a fairly good color fastness value to washing. Pterocarpus indicus bark contains tannin which has potential as a biomordant for natural Timorese weaving dyeing.
INDIKATOR PINTAR BERBASIS KITOSAN - ANTOSIANIN LIMBAH KULIT BAWANG MERAH UNTUK DETEKSI KESEGARAN DAGING BABI Kefi, Felisitas; Adu, Risna Erni Yati; Gelyaman, Gebhardus Djugian
Journal of Chemical Science and Application Vol. 2 No. 1 (2024)
Publisher : Program Studi Kimia Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jcsa.v2i1.5284

Abstract

Indikator pintar untuk deteksi kesegaran daging babi telah dibuat dari kitosan dan pewarna antosianin. Tujuan penelitian ini untuk mempelajari karakteristik kimia dan fisika dari indikator kesegaran berbasis kitosan – antosianin dan menguji respon indikator terhadap perubahan pH dan perubahan kesegaran daging babi. Tahapan penelitian meliputi preparasi dan ekstraksi limbah kulit bawang merah secara maserasi, fabrikasi film dengan metode solution casting dan karakterisasi film yang terdiri dari uji kimia dan uji fisika. Hasil penelitian menunjukkan bahwa massa film berkisar dari 0,65 – 1,18 gr dan kadar air sebesar 0,085% - 0,035%. Identifikasi gugus fungsi dengan FTIR menunjukkan adanya serapan khas dari antosianin dan kitosan pada bilangan gelombang 3622 cm-1 untuk gugus OH, bilangan gelombang 2349 cm-1 untuk gugus C-H alifatik, bilangan gelombang 1623cm-1-1670 cm-1 untuk gugus C=C, bilangan gelombang 1516 cm-1 untuk gugus NH dan gugus C-O-C pada bilangan gelombang 1063-1070 cm-1. Indikator pintar berbasis antosianin limbah kulit bawang merah memberikan respon terhadap perubahan pH dan perubahan kesegaran daging babi tetapi perbedaan warna yang dihasilkan tidak signifikan.
PENGGUNAAN EKSTRAK BIJI KUSAMBI (Schleichera oleosa) SEBAGAI INHIBITOR KOROSI PADA BAJA ASTM A36 DALAM MEDIA ASAM Manikin, Gerosa Risa Vianey; Batu, Matius Stefanus; Adu, Risna Erni Yati; Gelyaman, Gebhardus Djugian
Journal of Chemical Science and Application Vol. 2 No. 2 (2024)
Publisher : Program Studi Kimia Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jcsa.v2i2.8482

Abstract

Korosi merupakan proses degradasi dari material logam yang disebabkan oleh reaksi elektrokimia logam dengan lingkungannya. Proses korosi menyebabkan penurunan sifat mekanik logam sehingga dapat menyebabkan kerugian dalam aspek ekonomi dan keselamatan. Salah satu material yang mengalami korosi yaitu baja ASTM A36. Laju korosi logam akibat pengaruh lingkungan tidak bisa dihentikan namun lajunya dapat dikurangi. Salah satu solusi pencegahan korosi yang sangat populer adalah dengan cara penambahan zat inhibitor yang diperoleh dari ekstraksi bahan alam. Penelitian ini menggunakan inhibitor dari biji Kusambi dengan tujuan untuk mengetahui senyawa metabolit sekunder yang terkandung dalam ekstrak biji Kusambi yang didapatkan dengan cara ekstraksi maserasi dengan pelarut metanol, untuk mengetahui kondisi optimum (waktu perendaman dan suhu), serta analisis FTIR untuk mengetahui gugus fungsi. Hasil analisis fitokimia menunjukkan bahwa ekstrak metanol biji kusambi (Schleichera oleosa) mengandung senyawa metabolit sekunder yaitu alkaloid, flavonoid dan triterpenoid. Penelitian ini menggunakan metode pengurangan berat yang dilakukan dengan cara merendam logam ke dalam media HCl tanpa inhibitor, dan dengan inhibitor dilakukan dengan cara di coating lalu direndam dalam media HCl, dengan memvariasikan waktu perendaman yaitu 3, 6, 9, 12 dan 15 hari dan suhu 30oC, 35oC, 40oC, 45oC dan 50oC. Hasil penelitian menunjukkan bahwa kondisi optimum pada proses inhibisi korosi didapatkan pada waktu perendaman 6 hari dengan efisiensi inhibisi sebesar 90,62% dan laju korosi sebesar 0,1059 mm/tahun dan pada suhu 35oCdengan laju efisiensi inhibisi sebesar 77,77% dan laju korosi 0,0697 mm/tahun.   
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