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All Journal VALENSI Jurnal Sains Materi Indonesia Jurnal Ilmiah Arena Tekstil Indonesian Journal of Science and Technology Science and Technology Indonesia Al-Kimia Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry PENDIPA Journal of Science Education Jurnal Kartika Kimia Molekul: Jurnal Ilmiah Kimia Asean Journal of Science and Engineering (AJSE) Bulletin of Chemical Reaction Engineering & Catalysis Einstein's: Research Journal of Applied Physics al Kimiya : Jurnal Ilmu Kimia dan Terapan
Diana Rakhmawaty Eddy
Departemen Kimia, FMIPA, Universitas Padjadjaran
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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 1 
Microencapsulation of Lime Peel Essential Oils (Citrus aurantifolia) with Complex Coacervation Methods using Gelatin/Sodium Alginate Coating Sandra Puspita; Diana Rakhmawaty Eddy; Tatang Wahyudi; Euis Julaeha
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 1, May 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i1.14618

Abstract

Lime (Citrus aurantifolia) peel essential oils are complex metabolites mainly used as natural preservatives. The principal constituents include d-limonene, β-pinene, and terpineol. Moreover, essential oils (EOs) are potentially known volatile and unstable compounds, hence, they require proper packaging techniques, e.g., microencapsulation. The purpose of this study is to evaluate the binary methods of lime peel essential oils microencapsulation using complex coacervation. This involves the application of gelatin and sodium alginate coatings under two specific conditions, termed core/coating ratio 1:1.2, with modified stirring and core/coating ratio 1:2.0, with stirring speed of 600 rpm, respectively. The results showed the EOs preparation generated 0.70% yield characterized by good quality, fresh aroma, and pale-yellow coloration. Also, microcapsules delivered 37.06% yield, 39.18% oil content, 31.53% encapsulation efficiency (EE), and less smooth-edged SEM surface under condition I. Meanwhile, condition II demonstrated 51.46% yield, 58.66% oil content, 92.04% encapsulation efficiency (EE), and flat-curved, SEM surface. Furthermore, it was carefully observed condition II produced more superior microcapsules
The Use of Rice Husk Silica in Modified Zinc Oxide Photocatalysts to Reduce Chromium Concentration Diana Rakhmawaty Eddy; L Ahmad Na’ani; Rustaman Rustaman; Solihudin Solihudin
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 1, May 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i1.12324

Abstract

Rice husk ash contains approximately 90-98% dry weight of silica and they have been reported to have several advantages compared to mineral silica. One of these is its application as a filler in ZnO photocatalysts using the sol-gel method. This study was, therefore, conducted to determine the effect of adding rice husk silica to increase the ability of ZnO/SiO2 photocatalyst to reduce chromium concentration. Meanwhile, a previous effort has been made to degrade methylene blue dyes by 89%. This current research involved preparing rice husk charcoal using pyrolysis tubes after which they were extracted to produce silica while ZnO/SiO2 composites were made at a 95/5, 90/10, and 85/15 (w/w) ratio and composite activity test was conducted to determine its ability to reduce chromium concentration from practicum discharge. The SEM-EDS results showed the formation of SiO2 composites in ZnO while 82.6% decrease in total chromium concentration from waste was obtained after 2 hours irradiation with 95/5 composites using ultraviolet radiation.
Box-Behnken Experimental Design for Electrochemical Aptasensor Optimization on Screen Printed Carbon Electrode/Silica-Ceria Zakiyyah, Salma Nur; Eddy, Diana Rakhmawaty; Firdaus, Muhammad Lutfi; Subroto, Toto; Hartati, Yeni Wahyuni
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 1, May 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i1.27493

Abstract

This study aims to optimize the epithelial sodium channel (ENaC) electrochemical aptasensor with the Box-Behnken experimental design. ENaC is a protein that plays a role in sodium ion transport in several epithelial tissues and is associated with hypertension. The ENaC protein aptamer is held in place in the electrochemical aptasensor by a modified screen-printed carbon electrode (SPCE) of silica-ceria composite (SiO2-CeO2). The unique structure of a silica matrix with high biocompatibility can form composites through a hydrothermal process. The Box-Behnken (BBD) experimental design is an efficient optimization method of factors that affect the experiment at three levels. The FTIR results of the silica-ceria composites were 549.35 cm-1 (Ce-O), 1095.3 cm-1 (Si-O-Si), and 491.28 cm-1 (Si-O). Meanwhile, SPCE/silica-ceria characterized by differential pulse voltammetry (DPV) showed an increase in peak current [Fe(CN)6]3-/4- from 3.190 μA to 9.073 μA. Three experimental factors, aptamer concentration, streptavidin incubation time, and aptamer incubation time, were optimized with BBD and obtained at 0.5 μg.mL-1, 30 minutes, and 1 hour. The optimum conditions observed resulted in a selective current response for ENaC protein detection. The optimization results can be applied to aptamer-based ENaC protein detection in samples.
Co-Authors Adhitya Pratama Agus Surya Mulyawan Ahlam Nauval Mahendra Akrajas Ali Umar Alfi Ikhlasul Amal Alfi Ikhlasul Amal Alfian Nur Firdaus Amal, Alfi Ikhlasul Annisa Luthfiah Atiek Rostika Noviyanti Ayu Wanda Marita Azhari Yusuf Azman Bin Ma'Amor Azmi Prasasti Bimasakti Dea Fauziah Fitri Dini Janati Diyanthi, Erlinda Widyasmara Eko Prabowo Hadisantoso, Eko Prabowo Eneng Maryani Euis Julaeha Fadhilah, Riana Adisti Fajar Firmansyah Ferli Septi Irwansyah Ferry Arifiadi Firdaus, Muhammad Lutfi Firmansyah, Fajar Gani Abdilah Haryono Haryono Haryono Haryono Hasna Rofifah Novianti Herwinta, Syifa Rahmalia Ida Usman Idamayanti, Dewi Imam Supardi Iman Rahayu Iwan Hastiawan Iwan Hastiawan Iwan Hastiawan Jakariya Nugraha Juliandri Juliandri Khairani, Raisya Fakhira Kiagus Ahmad Mirza Azuri L Ahmad Na’ani L. Ahmad Na’ani La Aba Laelaturrohmah Laelaturrohmah Luthfia Pratiwi M. Diki Permana M. Lutfi Firdaus M. Lutfi Firdaus M. Lutfi Firdaus Mastuti Widi Lestari Mastuti Widi Lestari, Mastuti Widi Mohammad Rofik Usman Nila Sari Pandiangan Nuari, Sindhi Ika Nurqisthi, Faisha Pandu, Rinal Rahma, Aqilla Irfa Muthia Riana Adisti Fadhilah Rifky Adhia Pratama Rinal Pandu Risdiana Risdiana RISDIANA RISDIANA, RISDIANA Rukiah Rukiah Rustaman Rustaman Sahrul Hidayat Salma Nur Zakiyyah Sandra Puspita Sandra Puspita Sanidya Saraswati B Santhy Wyantuti Shariffuddin Bin Md Zain Solihudin Solihudin Solihudin Solihudin Soraya Nur Ishmah Sovia Islamiah Suryana Suryana Syamsiyatul Fajriyah Tatang Wahyudi Tatang Wahyudi Tatang Wahyudi Toto Subroto Yeni Wahyuni Hartati Yuni Nurhayati Yusi Deawati Zakiyyah, Salma Nur