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All Journal KOVALEN: Jurnal Riset Kimia Jurnal Sains dan Teknologi Jurnal Bakti Nusantara
Sulwiyatul Kamariyah Sani
Politeknik Negeri Medan
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Penguatan Potensi Lokal melalui Sosialisasi Inovasi Produk Dodol Salak di Desa Narigunung Satu, Kecamatan Tiganderket, Kabupaten Karo, Sumatera Utara Siti Mahmudha; Inten Pangestika; Pina Budiarti Pratiwi; Sulwiyatul Kamariyah Sani; adelia Yesya Putri Hasibuan
Jurnal Bakti Nusantara Vol. 3 No. 3 (2026): Jurnal Bakti Nusantara
Publisher : Pustaka Media Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63763/jutira.v3i3.122

Abstract

Desa Narigunung Satu, Kecamatan Tiganderket, Kabupaten Karo, memiliki potensi besar dalam sektor pertanian, khususnya pada komoditas buah salak yang produksinya meningkat signifikan dalam beberapa tahun terakhir. Namun, potensi tersebut belum dimanfaatkan secara optimal karena masyarakat masih menjual buah salak dalam bentuk segar dengan nilai ekonomi rendah dan masa simpan singkat. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan pengetahuan dan keterampilan kelompok ibu-ibu PKK Desa Narigunung Satu dalam mengolah buah salak menjadi produk bernilai tambah, yaitu dodol salak, sebagai strategi penguatan ekonomi keluarga berbasis potensi lokal. Metode kegiatan dilakukan melalui sosialisasi, demonstrasi, serta evaluasi pengetahuan peserta menggunakan pre-test dan post-test. Hasil kegiatan menunjukkan adanya peningkatan signifikan pada pemahaman peserta terhadap proses pengolahan, pengemasan, dan pemasaran produk. Peserta juga menunjukkan motivasi tinggi untuk mengembangkan usaha kecil berbasis olahan salak. Dengan demikian, kegiatan ini berhasil menjembatani kesenjangan antara potensi pertanian lokal dan kemampuan masyarakat dalam menciptakan inovasi produk, sekaligus mendorong kemandirian ekonomi desa yang berkelanjutan.
XRD-Based Structural and Crystallite Size Analysis of Nano-MgO Prepared via Sol–gel Method Imas Masriah; Devi Lestari; Sulwiyatul Kamariyah Sani; Inten Pangestika; Dikki Miswanda
KOVALEN: Jurnal Riset Kimia Vol. 11 No. 2 (2025): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2025.v11.i2.17909

Abstract

Nano-MgO was synthesized via a nitrate–citrate sol–gel combustion method, in which magnesium nitrate acted as the oxidizing precursor and citric acid served simultaneously as the chelating agent and organic fuel. The formation of a homogeneous Mg–citrate coordination network enabled controlled gelation, while the auto-combustion process produced a porous MgO matrix composed of ultrafine crystallites. Calcination at 800 °C promoted phase consolidation, removal of organic residues, and enhanced long-range atomic ordering. X-ray diffraction confirmed the exclusive formation of the cubic periclase phase (fm3m), with no detectable hydroxide or carbonate impurities. Crystallite size analysis yielded an average size of 16.03 nm based on the Scherrer equation, whereas the Williamson–Hall method produced a larger value of 25.44 nm with a microstrain of 5.37 × 10-4. indicating minimal lattice distortion. The discrepancy between the two size estimates reflects the contribution of microstrain effect not considered in the Scherrer approach. Overall, the synthesized nano-MgO exhibits high crystallinity, narrow crystallite size distribution, and excellent structural stability, highlighting its potential for catalytic, gas-sensing, and high-temperature functional applications. These results demonstrate that the sol–gel combustion method is an efficient and reliable strategy for producing nanocrystalline MgO with well-controlled structural characteristics.
A Review of Maghemite Nanoparticles as Environmental Sensors Imas Masriah; Devi Lestari; Prisca Caesa Moneteringtyas; Siti Mahmudha; Sulwiyatul Kamariyah Sani
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 3 (2025): Juni 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i3.5354

Abstract

The increasing urgency to monitor and mitigate environmental pollution has driven significant interest in the development of advanced sensing technologies. Nanotechnology presents promising solutions through the application of nanoscale materials, among which maghemite nanoparticles (γ-Fe2O3) have garnered considerable attention due to their unique physicochemical properties, high chemical stability, a large specific surface area, and superparamagnetic behavior, making them suitable for separation, target deployment, and sensor regeneration. It functionalized maghemite nanoparticles to enhance their selectivity toward specific pollutants, including heavy metals ( e.g., Pb2+ and Cd2+) and toxic gases (e.g., NO, NH3, and H2S). These articles present a review of the structural and physicochemical characteristics of maghemite nanoparticles, including commonly applied synthesis methods, sensor mechanism, and their applications in pollutant detection, such as heavy metals and toxic gases. The review also highlights current challenges and outlines future directions for the development of more efficient, affordable, and sustainable maghemite-based sensors for next-generation environmental monitoring systems.
Pengaruh Variasi Konsentrasi Asam pada Pembuatan Bioetanol dari Buah Kumbi (Voacanga foetida (Bl.) ROLFE) melalui Proses Hidrolisis Sulwiyatul Kamariyah Sani
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 4 (2025): Agustus 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i4.5702

Abstract

Currently, the availability of petroleum and natural gas as non-renewable energy sources is steadily decreasing. One alternative energy source that can be developed for the future is bioethanol, as it is renewable and environmentally friendly. The kumbi fruit (Voacanga foetida (Bl.) ROLFE) is a potential raw material for bioethanol production due to its cellulose content, which can be converted into bioethanol. The objective of this study was to investigate the effect of acid concentration on the hydrolysis process in the production of bioethanol from kumbi fruit. In this study, hydrolysis was carried out using HCl at concentrations of 1%, 2%, 3%, 4%, and 5% (v/v) at 70°C for 90 minutes. To determine the reducing sugar content produced, the hydrolysate was analyzed using UV-Vis spectrophotometry. The hydrolysate was then fermented using baker's yeast containing Saccharomyces cerevisiae for 72 hours. The fermentation product was distilled at 78°C, and the obtained bioethanol was analyzed using GC-MS. The results showed that the highest reducing sugar concentration was obtained at 2% acid concentration, amounting to 7.18 g/L, while the highest crude bioethanol yield was 47.64%, achieved at 4% acid concentration with a reducing sugar content of 1.04 g/L.
Co-Authors adelia Yesya Putri Hasibuan Devi Lestari Dikki Miswanda Imas Masriah Imas Masriah Inten Pangestika Pina Budiarti Pratiwi Prisca Caesa Moneteringtyas Siti Mahmudha