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All Journal Jurnal Fisika Unand Jurnal Riset Kimia EduChemia: Jurnal Kimia dan Pendidikan Lantanida Journal Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Hydrogen: Jurnal Kependidikan Kimia AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Journal Of Research and Education Chemistry (JREC) JURNAL KIMIA SAINTEK DAN PENDIDIKAN Jurnal Abdi Inovatif : Pengabdian kepada Masyarakat
Imelda Imelda
Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Andalas
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Social Sciences Veterinary Other

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Training on Postharvest Guava Fruit Processing in KWT Jambu Biji, VII Koto Sungai Sariak, Pariaman Yefrida Yefrida; Refilda Refilda; Imelda Imelda; Refinel Refinel; Rahmiana Zein; Safni Safni; Admi Admi; Dheasy Gustira; Jihanul Khaira; Harza Dipajana Umardi
Warta Pengabdian Andalas Vol 31 No 3 (2024)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.31.3.510-517.2024

Abstract

Red guava fruit is one type of fruit that quickly changes colour, texture and spoilage. This is of course a problem for farmers. At harvest time, not all of the fruit is marketable. So sometimes farmers just leave the fruit on the tree, because if harvested it will only increase operational costs. The KWT Jambu Biji Bengke Sakato, VII Koto Sungai Sariak, Pariaman is a group of red guava farmers. They tried to find a solution to this problem by discussing with TIM PPM KIMIA UNAND of the Department of Chemistry, FMIPA, Universitas Andalas. Finally it was agreed that the solution was to make products from red guava. The products made in this program are dodol and red guava ice cream. The KWT members and the Tim PPM KIMIA UNAND together made these two types of products. The results obtained, dodol and ice cream made are quite delicious and have an attractive appearance. This product can be an alternative to red guava processing that has economic value.
DFT-Based Mechanistic Study and QSAR Modeling of Antioxidant Activity of Triazole Derivatives Imelda; Anggi Febrianti; Aulia Syifa
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 2 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i2.990

Abstract

Triazole-derived compounds are known to exhibit a variety of favourable biological activities, including antioxidant, anti-inflammatory, and antibacterial activities. Research on the potential of these compounds as antioxidant compounds was carried out theoretically through analysis of global reactivity parameters and measurement of antioxidant activity. The Density Functional Theory (DFT) method was used to study the molecular structure, global reactivity parameters, and hydrogen-atom release mechanism by calculating BDE, IP, PDE, PA, and ETE values. Antioxidant activity was expressed as the Inhibition Concentration 50% (IC50) values obtained from multilinear regression-based Quantitative Structure-Activity Relationship (QSAR) analysis. Validation was performed by comparing theoretical IC50 values with experimental values. The results show that molecule A is the most reactive, followed by molecules B, D, and C, which have the same theoretical IC50 value as the experiment. The interaction of the compounds with ROS and RNS radicals exhibited spontaneous reactions with negative ?G, reinforcing their potential antioxidant activity. This study confirmed that triazole-derived compounds have the potential to be further developed as effective antioxidants.Contribution to Sustainable Development Goals (SDGs): SDG 2 – Zero HungerSDG 3 – Good Health and Well-BeingSDG 12 – Responsible Consumption and Production
Theoretical Analysis of Iron Corrosion Inhibition by Phytocasins using Density Functional Theory (DFT) Method Imelda Imelda; Emriadi Emriadi; Putri Syifa Sabrina; Dwi Ningsih Ostari
EduChemia: Jurnal Kimia dan Pendidikan Vol 11, No 1 (2026)
Publisher : Department of Chemistr Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/educhemia.v11i1.31892

Abstract

Phytocasin is a group of phytoalexin compounds that are synthesized and accumulate in plant cells after microbial infection. In this study, the Gaussian 16 W program package with the density functional theory (DFT) calculation method and the B3LYP/6-31G basis sets were used. The inhibitor molecules used were phytocasin A, B, C, D and E, differences in the positions of the hydroxyl (-OH) and carbonyl (C=O) groups in ring A. The analysis was carried out in the gas phase and water solvent. The results of quantum parameter calculations revealed that phytocasin has favorable electronic characteristics as an inhibitor, such as a relatively small band gap, low ionization potential, low electronegativity, indicating strong electron donation, low chemical hardness and high softness, increasing its surface reactivity. Electron transfer confirms the efficiency of charge exchange with Fe, supported by strong energy interaction and low back-donation transfer. Molecular electrostatic potential (ESP) analysis revealed carbonyl and hydroxyl groups as the dominant adsorption centers because of the highly electronegative region. The results of the calculations of bond energy, bond length and thermodynamic parameters indicate that phytocasin strongly and spontaneously interacts with Fe. These findings indicate that phytocasin is a beneficial natural iron corrosion inhibitor. The best phytocasin with potential as an iron corrosion inhibitor in the gas phase is phytocasin E, and in aqueous solvents, it is phytocasin B. The inhibitory reactivity of phytocasin in solvents is greater than that in the gas phase.
Modifikasi Struktur Akseptor Zat Warna Tipe D-π-A Berbasis Ditiofen sebagai Sensitizer pada Sel Surya Reshiva Reshiva; Imelda Imelda; Syukri Syukri; Admi Admi; Elvira Deswita
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.614-622.2025

Abstract

This study aims to evaluate the effect of variations in the acceptor group of dithiophen-based type D-π-A dyes that are efficiently used as sensitizers in DSSC. The calculation uses the 16W Gaussian program with Density Functional Theory (DFT) and Time Dependent-DFT (TD-DFT) methods with the B3LYP/6-31G set base. Based on the results of the study, it is known that acceptor variations can affect the shift in absorption spectrum and bandgap values. The dye AT5 is predicted to have higher efficiency to be used as a sensitizer, because it has the smallest bandgap value and has a dipole moment value, as well as a larger wavelength. The smaller the bandgap value, the absorbedyu light will shift towards the red shift, and the electron excitation process will be easier. It can be concluded that dyes with cyanide formal acceptors can improve the efficiency of D-π-A type dyes as sensitizers in DSSC.
Theoretical Study of The Structure of Anthocyanin Dyes to Improve The Performance of Dye Sensitized Solar Cells (DSSCs) Imelda; Jusmarni; Hermansyah Aziz; Elvira Deswita; Admi; Dwi Ningsih Ostari
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 2 (2026): April 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i2.18246

Abstract

In this study, anthocyanin dyes have been designed in two ways: without modification and with modification, incorporating donor chains and π-chains, and forming the structure of type D-π-A dyes. The anthocyanin dyes used are delphinidine, cyanidin, pelargonidin, malvidin, petunidine, and fragarine. Meanwhile, the modified molecule is a combination of anthocyanin dye as an acceptor chain, coumarin as a donor chain, and 1,4-dihydro-pyrrolo[3,2-b]pyrrole as a π-conjugation chain. The molecular structure was calculated using a 16W Gaussian Software with the DFT method and the B3LYP/6-31G base set. The results of the calculation on the dye without modification showed that the malvidin dye produced the smallest bandgap of 2.4085 eV and the largest light absorption. Meanwhile, the results of the calculation of the modified dye showed that the modified dye with the delphinidin acceptor produced the smallest bandgap of 1.4485 eV and the largest light absorption. In conclusion, modified anthocyanin dyes can improve the light absorption efficiency in DSSCs.
WORKSHOP PENGUATAN KOMPETENSI SISWA SMA DI KOTA PADANG MENUJU OLIMPIADE SAINS NASIONAL (OSN) IPA DAN MATEMATIKA TINGKAT NASIONAL Mildawati Mildawati; Solfiyeni Solfiyeni; Mairawita Mairawita; Fuji Astuti Febria; Muhammad Samudra Ilham; Zulfi Zulfi; Yefrida Yefrida; Imelda Imelda; Afdhal Muttaqin; Narwen Narwen; Efendi Efendi; Mahdivan Syafwan
Jurnal Abdi Inovatif : Pengabdian kepada Masyarakat Vol. 3 No. 1 (2024): Jurnal Abdi Inovatif : Pengabdian kepada Masyarakat
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/jai.v3i1.617

Abstract

The National Science Olympiad (OSN) is a prestigious event that involves the best students from various levels of education who have passed a rigorous selection at the district and provincial levels. One way to improve the quality of students in facing the OSN in Science and Mathematics is through structured coaching. The OSN Science and Mathematics Workshop held around the UNAND campus in Padang City is one such effort that has proven successful. The objectives of this workshop include three main aspects, namely improving the competence of high school students in basic science and mathematics, improving students' skills in solving OSN questions and improving the quality of high school education in Padang City. The workshop consisted of three main stages: planning, implementation, and evaluation. In the planning stage, OSN questions from the previous year were collected to be used as learning materials. The implementation stage involved a series of activities, including a pre-test, structured learning through lectures, question simulations, and discussions using audiovisual aids. The evaluation was conducted through a post-test to measure the improvement of students' understanding after attending the workshop. The results of this workshop showed a significant increase in the understanding of students who had participated from 30% to 60%. This illustrates the effectiveness of a sustainable and structured approach in improving student competencies to face OSN competitions in Science and Mathematics. This workshop could become a model for efforts to improve the quality of education in schools around the campus. It can be an inspiration for other educational institutions. Keywords: National Science Olympiad (OSN), Senior High School, workshop Abstrak Olimpiade Sains Nasional (OSN) adalah ajang prestisius yang melibatkan siswa-siswa terbaik dari berbagai tingkatan pendidikan yang telah melewati seleksi ketat di tingkat kabupaten dan provinsi. Salah satu cara meningkatkan kualitas siswa menghadapi OSN bidang IPA dan Matematika adalah melalui pembinaan terstruktur. Workshop OSN IPA dan Matematika yang diselenggarakan di sekitar kampus Universitas Andalas (UNAND) di Kota Padang adalah salah satu upaya yang telah terbukti berhasil. Tujuan dari workshop ini mencakup tiga aspek utama, yaitu meningkatkan kompetensi, keterampilan, dan mutu pendidikan siswa SMA dalam ilmu dasar IPA dan Matematika di Kota Padang. Workshop ini terdiri dari perencanaan, pelaksanaan, dan evaluasi. Pada tahap perencanaan, soal-soal OSN dari tahun sebelumnya dikumpulkan sebagai bahan pembelajaran. Tahap pelaksanaan, dilakukan pre-test, ceramah, simulasi soal, dan diskusi dengan peralatan audiovisual. Evaluasi dilakukan post-test untuk mengukur tingkat pemahaman siswa setelah workshop. Hasilnya, terjadi peningkatan signifikan dalam pemahaman soal OSN, yaitu dari 30% menjadi 60%. Hal ini menggambarkan efektivitas pendekatan berkelanjutan dan terstruktur dalam meningkatkan kompetensi siswa untuk menghadapi kompetisi OSN bidang IPA dan Matematika. Workshop semacam ini berpotensi menjadi model upaya peningkatan kualitas pendidikan di sekolah sekitar kampus dan dapat menjadi inspirasi bagi lembaga pendidikan lain. Kata Kunci: Olimpiade Sains Nasional (OSN), SMA, workshop
Peningkatan Pengelolaan Sampah Organik Melalui Teknologi Solar Biodigester dan Bioaktivator di Madrasah Aliyah Pondok Pesantren Mu’allimin Kecamatan Tilatang Kamang, Agam : Enhanced Management of Organic Waste through Solar Biodigester Technology and Bioactivators at Madrasah Aliyah Pondok Pesantren Mu’allimin, Tilatang Kamang District, Agam Regency Olly Norita Tetra; Refilda Refilda; Rahmiana Zein; Safni Safni; Emriadi Emriadi; Imelda Imelda; Deswati Deswati; Zulhadjri Zulhadjri
Jurnal Hilirisasi IPTEKS Vol. 9 No. 1 (2026)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v9i1.942

Abstract

Organic waste from food scraps is a major contributor to environmental pollution. The Madrasah Aliyah at the Mu’allimin Islamic Boarding School generates approximately 15–20 kg of organic waste per day, which is directly disposed of in a temporary storage area without any treatment. This has the potential to cause odors, environmental pollution, and health hazards. Therefore, food waste management is necessary to address these issues. One method of waste management is solar biodigester technology combined with bioactivators, which is a simple, inexpensive, and easy-to-implement technology. This community service activity aims to apply solar biodigester technology combined with bioactivators to reduce organic waste. Success indicators include a reduction in the volume of organic waste, the production of solid and liquid compost, accelerated degradation time, and increased understanding among participants. The method used is Participatory Approach through stages of outreach, training in the construction and operation of solar biodigesters, and practical sessions on bioactivator production. Evaluation was conducted by measuring waste volume before and after treatment, observing the degradation process, and assessing participants’ level of understanding. The results showed that the application of solar biodigester and bioactivator technology was able to reduce kitchen waste volume by 50.8% with a faster degradation time compared to conventional methods, and participants’ knowledge increased by 52.68%. The integration of solar biodigesters and bioactivators is effective in reducing organic waste, accelerating degradation, conserving land, and being environmentally friendly.
Co-Authors Admi Admi Afdhal Muttaqin Anggi Febrianti Apriska Prameswari Aulia Syifa Dahyunir Dahlan Deswati Deswati Deswati Deswati Dheasy Gustira Dwi Ningsih Ostari Dwi Ningsih Ostari Dwi Syukur Phameswari EFENDI Elvira Deswita Elvira Deswita Elvira Deswita Emriadi - Emriadi Emriadi Fuji Astuti Febria Harza Dipajana Umardi Hermansyah Aziz Hermansyah Aziz honesti putri Jihanul Khaira Jusmarni Mahdivan Syafwan Mildawati Mildawati Muhammad Samudra Ilham Narwen Narwen Oesamah Oesamah Olly Norita Tetra Putri Syifa Sabrina Rahmiana Zein Rahmiana Zein Refilda Refilda Refilda Refilda Refinel - Reshiva Reshiva Resin Teja Kusuma Rifky Farhan Rifno Gusfri Ramadhan Safni Safni Safni Safni Solfiyeni Solfiyeni Suryani, Hamzar Syukri Syukri Yefrida - Yuli Yetri Yulia - Zulfi Zulfi Zulhadjri Zulhadjri