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All Journal Jurnal Riset Kimia Jurnal Kimia Mulawarman Indonesian Journal of Chemistry Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks REACTOR : Journal of Research On Chemistry And Engineering Andalasian International Journal of Agricultural and Natural Sciences Andalasian International Journal of Applied Science, Engineering, and Technology AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Abdi Inovatif : Pengabdian kepada Masyarakat Jurnal Katalisator Jurnal Kimia Unand
Yefrida -
Universitas Andalas
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Social Sciences Other

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Development and Characterization of Edible Coating Potato Peel Starch (Solanum tuberosum L.) and Sungkai Leaves Extract to Prolong the Shelf Life of Strawberries (Fragaria sp.) Ardiani, Ajeng Putri; Yefrida, Yefrida; Refilda, Refilda
Indonesian Journal of Chemistry Vol 25, No 5 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.105258

Abstract

This study developed and characterized edible coatings from potato peel starch (Solanum tuberosum L.) to prolong the shelf life of strawberries (Fragaria sp.). Due to its high starch content, the edible coating was formulated using potato peel starch as the base material, and Sungkai leaf extract was added to enhance its antioxidant properties. The coating was characterized by viscosity, pH, color, antioxidant content, and thickness; and analyzed using FTIR, XRD, and SEM. The coating was applied to strawberries, and its effectiveness was evaluated based on weight loss and decay rate during storage. The edible coating was characterized by lower viscosity (10 cP), lower pH (6.83), darker color indicating bioactive compounds, and higher antioxidant content (5.72 mg AAE/g). FTIR data confirmed physical interactions among components; XRD revealed a semi-crystalline structure; and SEM showed a porous surface with visible cracks. Application of strawberries reduced weight loss and decay by 22.88 and 1.33% (day 4 at 3–5 °C) and 46.1 and 2.67% (day 12 at 28–31 °C). These results demonstrate the potential of potato peel starch and Sungkai leaf extract as an eco-friendly preservation solution.
Penentuan kandungan antioksidan dan fenolik total dari 5 spesies tumbuhan Famili Myrtaceae Yefrida; Isra, Hayatul; Refilda
Jurnal Kimia Unand Vol. 12 No. 1 (2023): May 2023
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.12.1.26-31.2023

Abstract

Plants that come from the Myrtaceae family are plants that are found in the tropics. These plants are widely used by the community as spices or medicinal ingredients. The research conducted aims to determine the antioxidant content and total phenolic content of 5 types of leaves of this plant. The total antioxidant content was determined using the MPM (Modified Phenanthroline Method) method while the total phenolic content was determined using the Folin-Ciocalteau method. Based on the research that has been done, it is found that the largest antioxidant content is found in the leaves of the Syzigium malaccence) plant 122.73 ± 3.10 mg AA/g DW while the largest total phenolic content is found in the leaves of the plant (Psidium guajava) 58.84 ± 1.86 mg GAE/g DW.
Determination of Flavonoids, Phenolic and Total Antioxidant Content from the Leaves, Stems and Roots of Betel Plants Yefrida; Harsita, Wanda Dwi; Refilda
Jurnal Kimia Unand Vol. 14 No. 2 (2025): November 2025
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.14.2.25-31.2025

Abstract

Betel (Piper betle L.) is one of the medicinal plants widely used in traditional medicine for its therapeutic properties. This study aimed to determine the levels of total flavonoids, phenolics, and antioxidants in the leaves, stems, and roots of four betel species, namely, Piper betle L., Piper ornatum N.E. Br., Peperomia pellucida (L.) Kunth, and Piper aduncum L. The Total Flavonoid Content (TFC) was measured using the aluminum chloride (AlCl₃) colorimetric method, while Total Phenolic Content (TPC) was determined using the Folin–Ciocalteu method. The antioxidant capacity was assessed by the 2,2-diphenyl-1-picrylhydrazyl (DPPH). The results showed that the highest TFC was found in Peperomia pellucida (L.) Kunth leaves (79.27 ± 1.37 mg QE/g DW), whereas the highest TPC was observed in Piper betle L. stems (23.97 ± 0.04 mg GAE/g DW). The strongest antioxidant capacity was also observed in Peperomia pellucida (L.) Kunth leaves (23.93 ± 0.36 mg AAE/g DW). Correlation analysis revealed a very strong relationship between TFC and antioxidant capacity in leaves (r = 0.9892) and a strong correlation between TPC and antioxidant capacity in roots (r = 0.9745). These findings suggest that the antioxidant potential of betel species is closely related to their secondary metabolite composition, particularly flavonoids and phenolic compounds.
Optimization of Producing Zein Clove Leaf Essential Oil Nanoparticles for Their Antioxidant Activities Refilda Refilda; Mutia Ramadani; Ainun Nasution; Imelda Imelda; Yefrida Yefrida; Irmanida Batubara
Andalasian International Journal of Agriculture and Natural Sciences (AIJANS) Vol. 5 No. 01 (2024)
Publisher : Lembaga Penelitian dan Pengabdian, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijans.v5.i01.9-20.2024

Abstract

Essential oils are often also referred to as flying oils produced by plants and usually volatile essential oils at room temperature, one of the essential oils with many uses is clove leaf essential oil (Syzygium aromaticum L). Zein-essential oil nanoparticles were prepared by varying the concentration of clove oil (0, 2, 4, 6, 8, and 20 mg/mL) added to 1.5 mg/mL zein and 1 ml tween 20 and sonicated for 20 minutes. The antioxidant activity of the zein-essential oil nanoparticles formed was tested using the DPPH method. The best antioxidant activity was found in the addition of clove leaf essential oil 8 mg/mL with a percentage of inhibition of 71.13%. Characterization test with a laser beam where the amount of light scattered by the solution. Chemical component analysis using Gas Chromatography Mass Spectrophotometry (GC-MS) showed the presence of 32 compounds with three main compounds, namely trans-?-caryophyllene (46.69%), chavibetol (25.80%) and - humulene (10.84%).
Comparative Analysis of Flavonoid and Phenolic Contents and Antioxidant Capacity in Different Plant Parts of Artemisia Yefrida Yefrida; Y.T. Putri; R Refilda
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 1 (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.v10i1.934

Abstract

Free radicals can lead to oxidative stress, causing cell damage, which underlines the importance of natural antioxidants. Although the genus Artemisia (Asteraceae) is a widely recognized source of bioactive compounds, comparative data on its antioxidant potential in specific organs remain scarce. In this study, the total flavonoid content (TFC), total phenolic content (TPC), and antioxidant capacity of the leaves, stems, and roots of four Artemisia species were evaluated, as well as their relationships. Total phenolic and flavonoid contents, determined by Folin–Ciocalteu and AlCl? methods respectively. The antioxidant capacity was determined using the DPPH test. The distribution patterns of phytochemicals and antioxidant capacity across organs were heterogeneous. Leaves contained the highest content of flavonoids and phenolic compounds, while roots demonstrated the strongest antioxidant capacity except for Artemisia vulgaris. Results show that plant components and species varied significantly (ANOVA, p < 0.05). The flavonoid and phenolic content of stems and leaves were strongly positively correlated with antioxidant capacity, while phenolic and flavonoid levels throughout the plant were closely correlated. These findings provide novel comparative insights into the antioxidant properties of flavonoid and phenolic compounds across different tissue types of diverse Artemisia species, as well as aiding the rational selection of plant material for potential applications in natural antioxidant use. Contribution to Sustainable Development Goals (SDGs):SDG 3   : Good Health and Well-BeingSDG 12 : Responsible Consumption and ProductionSDG 15 : Life on Land
Determination of Optimum Extraction Conditions for Antioxidant Capacity from White Turmeric Rhizome (Curcuma zedoaria (Christm.) Roscoe) Using Response Surface Methodology Nurjannah El Firsti; Yefrida; Refilda
Jurnal Riset Kimia Vol. 17 No. 1 (2026): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v17i1.872

Abstract

The role of free radicals in oxidative stress poses risks to cells and tissues. The effect of stress and tissue oxidation damage leads to loss of structure and, ultimately, tissue necrosis. Antioxidants quell free radicals and stabilize them. White turmeric (Curcuma zedoaria (Christm.) Roscoe) rhizome, another natural source used in traditional medicine, is said to have some potential as an antioxidant. The current study sought to investigate methods used in devising the optimization of antioxidant extraction from white turmeric using the decoction method. The main factors considered were temperature, extraction time, and sample-to-solvent ratio. The DPPH assay measured at 522 nm provided the readings for antioxidant activity. The initial OFAT approach used to devise the experiment tested and confirmed those optimal conditions of extraction (80 ˚C, 50 minutes, and 1:25 g/mL). These optimal conditions were tested in the central composite design within RSM. The confirmation of optimal conditions within RSM was (84 ˚C, 51 minutes, 1:25 g/mL). The extraction of 1.3963 mg AAE/g FW and the predicted value of 1.3450 mg AAE/g FW. These findings validate the extraction efficiency in RSM and demonstrate the antioxidant potential of white turmeric in the pharmaceutical industry.
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
Variation in Phenolic, Flavonoid, and Antioxidant Content of Rosa × hybrida Based on Flower Organs and Color: The Basis for Pruning Biomass Valorization Yefrida Yefrida; Sepriyaldi; Refilda Refilda
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 3 (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.v10i3.1304

Abstract

Hybrid rose plants are not only valuable as floriculture commodities, but also have the potential to be a source of bioactive compounds. In cultivation activities, leaves and stems from pruning are often not fully utilized, so a scientific basis is needed to select the most promising biomass and to develop a simple extraction process. This study analyzed total flavonoids, total phenolics, and antioxidant capacity in red, pink, white, and purple flowers, stems, and leaves of Rosa × hybrida Schleich. We extracted fresh samples by infusion in distilled water at 90 °C for 15 minutes. Total flavonoids were determined by AlCl3 complexation and expressed as mg QE/g FW; total phenolics were determined with Folin–Ciocalteu as mg GAE/g FW; while antioxidant capacity was measured by DPPH and the Modified Phenanthroline Method (MPM) as mg AAE/g FW. The highest flavonoids were found in purple stems (37.046 ± 17.557 mg QE/g FW), the highest phenolics in pink flowers (20.286 ± 1.704 mg GAE/g FW), the highest DPPH in purple leaves (10.928 ± 1.227 mg AAE/g FW), and the highest MPM in purple stems (7.762 ± 3.111 mg AAE/g FW). DPPH and MPM were highly correlated in flowers, stems, and leaves (r = 0.997–0.999). These findings suggest that vegetative biomass, especially purple rose stems and leaves, should be prioritized for the development of aqueous extracts and the valorization of pruning biomass. This study is a laboratory proof of concept; economic impact, community adoption, safety, and product performance still require further pilot testing. Potential contribution to the Sustainable Development Goals (SDGs):SDG 3: Good Health and Well-BeingSDG 12: Responsible Consumption and Production
Co-Authors Admi Admi Admi Admi Afdhal Muttaqin Ainun Nasution Aldini, Tasya Ardiani, Ajeng Putri Ashikin, Nor Boneta, Fella Krisna Deliza, Deliza Dheasy Gustira Dheasy Gustira Dini Hanifa Dwi Syukur Phameswari EFENDI Elida Mardiah Elinda Fithriana Emil Salim Etriyanto Arman Farrah Aprilina Fella Krisna Boneta Fivi Mona Bareno Fuji Astuti Febria Hamidah, Nofi Hamzar Suyani Harsita, Wanda Dwi Harza Dipajana Umardi Harza Dipajana Umardi Hayatul Isra Hayatul Isra Hermansyah Aziz Hermansyah Aziz Humaira, H Ilahi, Fitratul Imelda Imelda Imelda Imelda Indrawati - Indrawati Indrawati Indri Ticel Leone Irma Yanti Siregar Irmanida Batubara Isra, Hayatul Jihanul Khaira Jihanul Khaira Mahdivan Syafwan Mai Efdi Matlal Fajri Alif Mega Ulfaningsih Mildawati Mildawati Muhammad Samudra Ilham Mutia Ramadani Narwen Narwen ndrawati - Nindi Rahmi Amelia Nofi Hamidah Nor Ashikin Nor Ashikin Norman Ferdinal Novesar Jamarun Novita Lucia Nurjannah El Firsti Nurul Afifah Rahmiana Zein Raihan Hanif Aulia Refilda Refilda Refilda Refilda Refilda Refilda Refinel - Richi Silvianti Riga Habib Ngestu Rosman, Widuri Safni Safni Salim, Emil Sepriyaldi Silvia Detri Susanti Solfiyeni Solfiyeni Sumaryati Syukur Suryati Suryati Syafrizayanti Syafrizayanti Syukri Syukri Tommi Hermansyah Umiati Loekman Umiati Loekman Upita Septiani Wellia, Diana Vanda Widuri Rosman Y.T. Putri Yani Kasuma Putri Yetria Rilda Yola Tsurayya Putri Yulizar Yusuf Zilfa Zilfa Zulfi Zulfi Zulkarnain Chaidir