Cases of hypercholesterolemia continue to increase every year and have become one of the major risk factors for cardiovascular disease. Modern antihypercholesterolemic drugs, such as statins, often cause adverse side effects rhabdomyolysis, creating the need for safer therapeutic alternatives. Pelawan leaves (Tristaniopsis merguensis) are a natural ingredient containing various bioactive compou…
The demands of 21st-century learning emphasize the strengthening of higher-order thinking skills (HOTS), particularly in abstract chemistry topics such as reaction rates, while interactive learning media capable of optimally training students’ HOTS remain limited. This study aimed to develop interactive multimedia on reaction rate material to enhance the Higher-Order Thinking Skills (HOTS) of…
A global issue that remains a topic of discussion to this day is the energy crisis caused by the dwindling supply of non-renewable energy and environmental pollution. Therefore, every country is starting to look for alternative energy sources that can be used, especially from biological resources, one of which is biodiesel. Biodiesel is a type of fuel derived from renewable resources. An innova…
Prolonged accumulation of biomass waste can trigger anaerobic decomposition and greenhouse gas (GHG) emissions due to its difficult to decompose nature. One alternative utilization of biomass waste is by converting it into value-added products such as biochar through a thermochemical conversion process. This study aims to analyze the effect of temperature and time of hydrothermal carbonization …
Red galangal (Alpinia purpurata) is a species of the Zingiberaceae family that has potential as a source of bioactive compounds. The main objectives of this study were to identify secondary metabolites from red galangal rhizomes (A. purpurata) and to determine their antioxidant and antibacterial activities. Red galangal rhizomes were extracted and then separated to obtain fractions. The extract…
Daerah penelitian berada di Bumi Genap dan sekitarnya, Kabupaten Ogan Komering Ulu Selatan, Sumatera Selatan, yang termasuk dalam Formasi Garba (Kjg). Wilayah ini didominasi oleh batuan beku vulkanik berupa basalt yang belum banyak dikaji terkait petrogenesis dan lingkungan tektoniknya. Penelitian ini bertujuan untuk mengidentifikasi karakteristik petrografi, menentukan afinitas magma melalui a…
Pabrik pembuatan bahan asam sulfat dengan kapasitas 270.000 ton/tahun direncanakan untuk berdiri pada tahun 2028 di Desa Sumber Arum, Kecamatan Kerek, Kabupaten Tuban, Jawa Timur, dengan perkiraan luas area pabrik seluas 5 ha. Proses pembuatan senyawa ini mengacu kepada paten dengan nomor WO2023097389. Bahan baku yang digunakan yaitu flue gas dengan bantuan katalis Vanadium Pentaoksida (V2O5). …
Pabrik pembuatan Butil Asetat dengan kapasitas produksi 45.000 ton/tahun direncanakan akan berdiri pada tahun 2032 di kawasan industri JIIPE, Gresik, Jawa Timur dengan luas 2,4347 ha. Butil Asetat pada pabrik ini disintesis dari bahan baku Butanol dan Asam Asetat dengan katalis Amberlyst-15 di dalam fixed bed reactor berdasarkan Patent CN 117843478 A. Reaksi berlangsung pada temperatur 130 oC d…
Urea (CH₄N₂O) is widely used in agriculture, medicine, and industry; however, excessive accumulation can negatively impact the environment and human health. Therefore, a sensor that is fast, accurate, and stable is required. This study evaluates CuO-TiO₂/C electrodes based on Vulcan carbon, Binchotan carbon, and polyaniline (PANI) modification as urea sensors in 0.1 M NaOH. The electrodes…
This study aimed to develop and evaluate the performance of MnO₂–TiO₂/C composite electrodes as electrochemical sensors for methanol detection using different carbon materials, namely Vulcan carbon, binchotan carbon, and Vulcan carbon modified with polyaniline (PANI). XRD analysis confirmed the presence of crystalline MnO₂ and TiO₂ phases at 2θ angles of 28.6° and 25.3°, respective…
Pabrik pembuatan etil asetat dengan kapasitas produksi 73.000 ton/tahun direncanakan pembangunannya pada tahun 2032 yang berlokasi di Kabupaten Gresik, Jawa timur seluas 4,833 Ha. Operasi pabrik berjalan selama 24 jam/hari dalam 300 hari/tahun. Komoditi etil asetat yang diproduksi mengacu pada Patent WO No. 2024/081921 A2 yang menggunakan proses dehidrogenasi dan hidrogenasi dengan etanol sebag…
Penelitian pengembangan ini bertujuan untuk menghasilkan Lembar Kerja Peserta Didik (LKPD) berbasis Problem Based Learning (PBL) pada materi Hidrokarbon yang valid, praktis, dan efektif. Metode penelitian yang digunakan adalah Research and Development (R&D) dengan model 4D (Define, Design, Develop, Disseminate), yang dipadukan dengan model evaluasi Tessmer. Pengumpulan data dilakukan menggunaka…
Penelitian ini bertujuan untuk menganalisis Keterampilan Proses Sains kelompok mahasiswa pada praktikum kimia anorganik I pada materi Penetapan Kapasitas Penetralan Asam Tablet Antasida Dengan Titrasi Balik. Penelitian ini merupakan penelitian yang menggunakan metode penelitian kualitatif deskriptif, dengan pengambilan sampel dilakukan melalui teknik purposive sampling. Sampel dalam penelitian …
Temu ireng (Curcuma aeruginosa Roxb.) is a medicinal plant from the Zingiberaceae family that is widespread in South Asia and Southeast Asia and has been reported to have antibacterial, anticancer, and antioxidant activities, especially in the rhizome. However, information on the antioxidant and antibacterial activities of fraction and isolated compounds is still limited. This study aims to ass…
ABSTRACT : Lenglengan (Leucas lavandulifolia) belongs to the Lamiaceae family. L. lavandulifolia is traditionally used in the treatment of headaches, migraines, rheumatism, and diabetes. Information on the activity and chemical content of L. lavandulifolia stems is still limited. The purpose of this study was to determine the antioxidant activity and chemical content of the most active column f…
Oil palm empty fruit bunches (EFB) are an abundant lignocellulosic waste in Indonesia with significant potential as a renewable energy source. However, the liquid product obtained from EFB pyrolysis still exhibits drawbacks, including high oxygen content and low stability, thus requiring further upgrading. One effective method to improve the quality of the liquid product is hydrocracking using …
Rambutan peel (Nephelium lappaceum L.) is an organic waste that has the potential to be used as a source of natural antioxidants due to its high phenolic and flavonoid content. This study aims to determine the total phenolic and flavonoid content, antioxidant activity, and quality characteristics of rambutan peel tea. Rambutan peel samples were dried, ground, and brewed using hot water at 90 °…
Sungkai leaves (Peronema canescens Jack.) have potential as a raw material for herbal tea and as a natural source of antioxidants. This study aimed to determine the total phenolic and flavonoid contents, antioxidant activity, and quality parameters of sungkai leaf simplicia tea compared with gambir leaf tea, soursop leaf tea, and commercial tea. The samples were dried, ground, and brewed using …
This study evaluates the performance and durability of Membrane Electrode Assembly (MEA) in Proton Exchange Membrane Fuel Cell (PEMFC) fabricated via Catalyst Coated Substrate (CCS) and Decal Transfer Method (DTM) using Kapton and PTFE substrates. The fabrication technique significantly impacts the catalyst layer structure and electrochemical properties. Characterization through Cyclic Voltamme…
The increasing global energy demand and environmental impacts of fossil fuels have driven the development of clean and sustainable energy sources. Hydrogen is a promising alternative due to its environmentally friendly nature and significant potential in future energy systems. Hydrogen production through water electrolysis using Proton Exchange Membrane Water Electrolysis (PEMWE) is efficient a…
Penelitian ini bertujuan untuk menganalisis hubungan antara karakteristik ukuran butir sedimen dengan distribusi unsur tanah jarang (Rare Earth Elements/REE) pada sedimen dasar laut di Perairan Deniang, Kabupaten Bangka, Provinsi Kepulauan Bangka Belitung. Data yang digunakan berupa data ukuran butir sedimen dan data geokimia REE hasil analisis ICP-MS yang diperoleh dari Balai Besar Survei dan …
Penelitian ini dilakukan di Danau Rayo, Kabupaten Musi Rawas Utara, Sumatera Selatan, dengan luas area 1,2 × 1,2 km yang bertujuan mengidentifikasi fasies hidrokimia dan mekanisme yang mengontrol evolusi. Metode yang digunakan meliputi pengambilan sampel air tanah dan air permukaan, pengukuran parameter fisika, serta analisis laboratorium terhadap ion utama. Interpretasi fasies hidrokimia meng…
Water pollution caused by synthetic dyes, such as Congo red (CR) and Methylene blue (MB), which are difficult to degrade, requires effective treatment methods. Adsorption is selected as an alternative due to its low cost and simplicity. Adsorption is a process in which molecules, ions, or atoms adhere to a surface. This study aims to evaluate the potential of Azolla microphylla (AM) biomass as …
Pencemaran lingkungan oleh logam berat merupakan masalah besar yang tidak hanya berdampak pada makhluk hidup, tapi juga mengganggu keseimbangan ekosistem. Sebagai bahan pencemar yang tidak dapat dihancurkan atau dimusnahkan, logam berat sangat berbahaya karena akumulasi di alam dan dalam tubuh organisme. Adsorpsi merupakan metode pengolahan alternatif untuk air limbah dalam menghilangkan logam …
Produksi biochar merupakan salah satu pendekatan pengelolaan limbah biomassa yang banyak digunakan melalui proses pirolisis dan berpotensi dimanfaatkan sebagai amandemen tanah. Limbah kulit kayu Eucalyptus pellita yang digunakan dalam penelitian ini diperoleh dari industri pulp dan kertas di Muara Enim, Sumatera Selatan, Indonesia, digunakan sebagai bahan baku. Biochar diproduksi melalui proses…
This study aims to analyze students' critical thinking abilities in solving Higher Order Thinking Skills (HOTS) questions on chemical bonding material and to identify the most dominant Ennis critical thinking indicators. The research was conducted at Srijaya Negara High School in Palembang during the 2025/2026 academic year, first semester, using a quantitative descriptive method. The research …
21st-century education demands mastery of critical thinking skills as part of higherorder thinking skills. The Merdeka Curriculum was introduced to meet this demand, but students' critical thinking abilities in solving HOTS questions have not been fully measured comprehensively. This study aims to analyze students' critical thinking abilities in solving HOTS questions on atomic structure materi…
Stres oksidatif berperan penting dalam patogenesis berbagai penyakit degeneratif melalui pembentukan radikal bebas. Buah bit (Beta vulgaris) diketahui mengandung senyawa bioaktif yang berpotensi sebagai antioksidan alami. Penelitian ini bertujuan untuk mengeksplorasi potensi senyawa aktif dalam ekstrak metanol buah bit sebagai inhibitor enzim pembentuk radikal bebas melalui pendekatan molecular…
This study aims to synthesize and characterize Zn–Terephthalate MOF as a bifunctional heterogeneous catalyst for biodiesel production from waste cooking oil. The material was synthesized via a solvothermal method with variations in the precursor ratio of Zn(NO₃)₂·6H₂O to terephthalic acid (1:2, 1:1, and 2:1) to evaluate the effect of metal–ligand composition on structural properties …
Pb(II) merupakan salah satu logam yang berbahaya dan dapat memicu berbagai masalah kesehatan kronis. Paparan logam Pb (II) dapat merusak sistem saraf dan kekebalan tubuh manusia, serta menyebabkan kerusakan permanen pada organ tubuh dapat merusak DNA manusia, sehingga berdampak negatif pada kesehatan. Untuk mengatasi hal tersebut, penelitian ini dilakukan untuk mengembangkan komposit CMC-Poliak…