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All Journal VALENSI Jurnal Ilmu Lingkungan AL KAUNIYAH JURNAL ISTEK Elkawnie Jurnal SOLMA Indonesian Journal of Chemistry Jurnal Riset Pendidikan Kimia (JRPK) Jurnal Riset Sains dan Kimia Terapan al Kimiya : Jurnal Ilmu Kimia dan Terapan Scientific Contributions Oil and Gas
Meyliana Wulandari
Chemistry Department, Faculty Of Mathematics And Naturan Science, Universitas Negeri Jakarta
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Materials Science & Nanotechnology Other

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Deteksi Dini Diabetes Melitus dan Edukasi Kesehatan bagi Guru Kimia Madrasah Aliyah, Jakarta Wulandari, Meyliana; Kartika, Irma Ratna; Ramadani, Rosi Fitri
Jurnal SOLMA Vol. 15 No. 1 (2026)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v15i1.21581

Abstract

Pendahuluan: Diabetes melitus (DM) merupakan penyakit kronis yang terus meningkat dan membutuhkan upaya deteksi dini serta edukasi yang komprehensif, terutama bagi kelompok berisiko seperti guru. Program Pengabdian kepada Masyarakat ini bertujuan untuk meningkatkan pengetahuan dan kesadaran guru Kimia MA MGMP Provinsi DKI Jakarta melalui deteksi dini DM, serta edukasi penerapan pola makan sehat. Metode: Pemeriksaan kadar glukosa darah, pretest dan postest pengetahuan DM, serta penyampaian materi interaktif oleh dosen. Hasil: Hasil menunjukkan bahwa 25–40% peserta pada tiap kelompok usia memiliki kadar glukosa darah puasa >126 mg/dL yang mengindikasikan tingginya risiko DM (ambang batas normal puasa <100 mg/dL). Perbandingan nilai pretest dan postest berdasarkan uji-t memperlihatkan peningkatan pengetahuan peserta (p<0,001), sementara survei umpan balik menunjukkan lebih dari 96% peserta merasa kegiatan ini sangat bermanfaat, relevan, dan aplikatif. Kesimpulan: Kegiatan ini terbukti efektif dalam meningkatkan literasi kesehatan guru serta mendorong praktik hidup sehat di lingkungan sekolah. Program ini juga mendukung capaian IKU-PTN dan SDG 3 terutama pada tujuan kesehatan dan kesejahteraan.
Penguatan Kompetensi Guru Madrasah Aliyah Wilayah MGMP Kimia Jakarta melalui Implementasi E-Modul Kimia Berbasis STEM dan Etnosains Nurjayadi, Muktiningsih; Wulandari, Meyliana; Hati, Futi Kusuma; Fitri, Ika Keumala; Fatimah, Siti; Nur’aini, Ruhul Aflah; Purnama, Yaktiva Dwi; Erliasna, Emia
Jurnal SOLMA Vol. 15 No. 1 (2026)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v15i1.22706

Abstract

Background: Madrasah Aliyah (MA) menghadapi tantangan berupa keterbatasan waktu pembelajaran dan sarana praktikum yang berdampak pada optimalisasi pembelajaran kimia. Pemanfaatan e-modul berbasis STEM dan etnosains menjadi alternatif inovatif, namun implementasinya masih memerlukan penguatan kompetensi guru. Kegiatan pengabdian ini bertujuan meningkatkan kompetensi guru kimia MA yang tergabung dalam MGMP Kimia Jakarta melalui pelatihan dan pendampingan implementasi e-modul generasi keempat berbasis STEM-POGIL, STEM–Case Based Learning, dan etnosains pada materi laju reaksi, koloid, dan larutan penyangga. Metode: Kegiatan pengabdian kepada masyarakat ini dilaksanakan melalui pendekatan blended learning berupa pelatihan, diskusi kelompok terarah (FGD), dan pendampingan kepada guru kimia Madrasah Aliyah yang tergabung dalam MGMP Kementerian Agama DKI Jakarta. Materi meliputi penggunaan e-modul kimia generasi keempat berbasis STEM-POGIL pada materi laju reaksi, STEM–Case Based Learning pada koloid, serta pendekatan etnosains pada larutan penyangga. Evaluasi dilakukan menggunakan pre-test, post-test, serta kuesioner tertutup dan terbuka. Hasil:  Hasil menunjukkan peningkatan pemahaman yang signifikan, ditandai dengan dominasi skor post-test sebesar 100% pada sebagian besar indikator dibandingkan pre-test yang masih berada pada rentang 60–70% pada beberapa butir, serta tidak adanya peserta dengan skor di bawah 60 pada akhir kegiatan. Tingkat kepuasan peserta juga berada pada kategori sangat baik (88,3–98,3%), terutama pada aspek penguasaan materi narasumber (98,3%) dan pemahaman materi (97,2%). Kesimpulan: Meskipun demikian, implementasi di sekolah masih menghadapi kendala infrastruktur dan kebijakan internal, sehingga diperlukan pendampingan berkelanjutan untuk memastikan penerapan e-modul berbasis STEM dan etnosains secara lebih merata dan berkelanjutan.
The Total Phenolic, Total Flavonoid, and Brown Pigment in Honey Before and After Heating Achmad Tjachja Nugraha; La Ode Sumarlin; Anna Muawanah; Nurul Amilia; Meyliana Wulandari
Elkawnie Vol. 8 No. 1 (2022)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v8i1.12757

Abstract

Abstract: Honey has unique components, a characteristic that makes it a valuable food for consumers. It is known that UV radiation and heating impact the quality of honey's bioactive compounds, including total phenolic, total flavonoid, and brown pigment contents. The absorbance of brown pigment at a wavelength of 420 nm, total phenolic at a wavelength of 733 nm, and total flavonoid at a wavelength of 430 nm was measured using a UV-Vis spectrophotometer. The method used in the total phenolic test was the Folin-Ciocalteu method with gallic acid standard (mgGAE/g sample). In contrast, for flavonoids, the method used was the colorimetric method with quercetin standard (mg QE/g sample). The qualitative test results showed that all honey samples contained phenolic and flavonoid compounds. Total phenolic and flavonoid levels showed a decrease in several samples, including TR SLT (Trigona Southeast Sulawesi), TRG BGR (Trigona Bogor), and TR SLS (Trigona Genotrigona Indica South Sulawesi) in the range of 11.8–57.6%. However, most of the total phenolic and flavonoid levels increased after the heating process, i.e., in the samples of AP LMB (apis North Lombok) (25.3% and 88.8%), AP MG (apis mango) (73.1% and 114%), AP MAC (Aceh honey, Buloh Seuma) (8.8% and 199%), TR BIR (Trigona tetroginola biroi South Sulawesi) (58.8% and 146%), and TR LMB (Trigona North Lombok) (44.3% and 84.9%). In contrast, for the formation of brown pigment, there was an increase in all honey samples between 32 and 1.428%. The presence of brown pigment at the end of the heating process of honey samples is thought to have the same role as phenolic compounds and flavonoids, which change the heating process, especially in antioxidant activities and other bioactivities. However, further analysis is needed to prove the conjecture.Abstrak: Madu memiliki komponen yang unik, yang membuatnya menjadi makanan yang berharga bagi konsumen.  Telah diketahui bahwa radiasi UV dan pemanasan berdampak pada kualitas senyawa bioaktif madu, di antaranya kandungan total fenolik, total flavonoid, dan pigmen coklat. Pengukuran absorbansi pigmen coklat pada panjang gelombang 420 nm, pengukuran total fenolik pada panjang gelombang 733 nm dan total flavonoid pada panjang gelombang 430 nm dilakukan menggunakan spektrofotometer UV-Vis. Metode yang digunakan untuk uji total fenolik adalah metode Folin-Ciocalteu dengan standar asam Galat (mgGAE/g sampel), uji flavonoid menggunakan metode Kolorimetri dengan standar kuersetin (mg QE/g sampel).  Hasil uji kualitatif menunjukan bahwa semua sampel madu terdapat senyawa fenolik dan flavonoid. Kadar total fenolik dan flavonoid menunjukkan penurunan pada beberapa sampel, di antaranya TR SLT (Trigona Sulawesi Tenggara, TRG BGR (Trigona Bogor), TR SLS (Trigona Genotrigona Insica Sulawesi Selatan) pada kisaran 11,8 – 57,6%.  Namun, sebagian besar kadar total fenolik dan kadar flavonoid mengalami kenaikan setelah proses pemanasan, yaitu pada sampel AP LMB (apis Lombok Utara) (25,3% dan 88,8%), AP MG (apis mangga) (73,1% dan 114%), AP MAC (madu Aceh, Buloh Seuma) (8,8% dan 199%), TR BIR (Trigona Tetroginola biroi sulawesi selatan) (58,8% dan 146%), TR LMB (Trigona North Lombok) (44,3% dan 84,9), sedangkan untuk pembentukan pigmen coklat, terjadi peningkatan pada semua sampel madu di antara 32 – 1.428%. Keberadaan pigmen coklat pada akhir proses pemanasan, diduga memiliki peran yang sama dengan senyawa fenolik dan flavonoid yang mengalami perubahan selama proses pemanasan, terutama pada aktivitas antioksidan dan bioaktivitas lainnya.  Namun diperlukan analisis lebih lanjut untuk membuktikan dugaan tersebut.
Lanthanum Metal-Organic Frameworks as Binding Agent in Diffusive Gradients in Thin Films (DGT) for Phosphate Monitoring: Influence of pH and Competing Anions Citra Santikasari; Asep Saefumillah; Agustino Zulys; Meyliana Wulandari
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.50201

Abstract

Phosphate mobility and bioavailability play critical roles in aquatic ecosystems, yet conventional monitoring methods are limited by sample disturbance and poor representation of in-situ conditions. The Diffusive Gradients in Thin Films (DGT) technique overcomes these limitations by enabling passive, in-situ measurement that accurately reflects natural solute diffusion and sediment resupply dynamics. This study introduces lanthanum metal-organic frameworks (La-MOF) as a novel selective binding agent in a DGT for in situ phosphate monitoring. La-MOF was synthesized via solvothermal using DMF (La-MOF 1) and mixed DMF/water (La-MOF 2), then characterized by XRD, FTIR, SEM-EDX, and BET analysis. Structural characterization confirmed successful framework formation for both materials. La-MOF 2 exhibited improved crystallinity, more homogeneous morphology, higher specific surface area (84.96 m2 g-1) and larger pore volume (0.090 cc g-1) compared to La-MOF 1. The selectivity performance of La-MOF DGT was evaluated across pH 2-11 and in the presence of competing anions (NO3-, SO42-, and CO32-). Optimal phosphate uptake occurred at pH 4-7, corresponding to the predominance of H2PO4- species. The inhibitory effect on phosphate uptake followed the order: NO3⁻ > CO3²⁻ > SO4²⁻. These findings demonstrate the potential applicability of La-MOF as a selective binding agent for DGT-based phosphate monitoring in aquatic environments.
Analysis of Students’ Scientific Process Skills Using the Discovery Learning Model on the Colligative Properties of Solutions Fawziyah Sholihah Bayliz; Rizqy Nur Sholihat; Meyliana Wulandari
Jurnal Riset Pendidikan Kimia (JRPK) Vol. 16 No. 1 (2026): Jurnal Riset Pendidikan Kimia (JRPK), Volume 16 Nomor 1 (2026)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRPK.161.01

Abstract

Scientific process skills (SPS) are essential competencies that enable students to investigate phenomena, solve problems, and construct scientific understanding. Despite their importance, the development of SPS in chemistry learning remains challenging, particularly in topics that require conceptual understanding and practical investigation, such as colligative properties of solutions. This descriptive quantitative study assessed students’ scientific process skills during Discovery Learning-based instruction on colligative properties of solutions. The participants were 34 twelfth-grade students from SMA Negeri 14 Bekasi selected through purposive sampling. Data were collected using observation sheets completed by six observers and a 21-item student questionnaire. The data were analyzed using descriptive statistics to determine the level of SPS achievement across eleven skill indicators. The findings revealed that the average SPS score was 74.16% based on observations and 76.54% based on questionnaires, both categorized as good. Students demonstrated the strongest performance in using laboratory tools and materials, while predicting and hypothesis formulation showed comparatively lower achievement. These results suggest that Discovery Learning effectively supports the development of practical and inquiry-based scientific skills by actively engaging students in experimentation and concept discovery. However, higher-order SPS components, particularly prediction and hypothesis formulation, require additional instructional support. This study contributes empirical evidence on students’ SPS profiles in chemistry learning and highlights specific skill areas that should be strengthened to optimize Discovery Learning implementation in secondary education.
Identification and Assay of Isoniazid and Pyrazinamide in Fixed-Dose Dispersible Tablets Containing Rifampicin Using High-Performance Liquid Chromatography Citra Santikasari; Meyliana Wulandari; Shofi Nafisa Ulfa; Mirawati Siregar; Syed Azhar Syed Sulaiman
Jurnal Riset Sains dan Kimia Terapan Vol. 11 No. 2 (2025): Jurnal Riset Sains dan Kimia Terapan, Volume 11 Nomor 2, Desember 2025
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.112.04

Abstract

Tuberculosis (TB) remains a major global health challenge, particularly in Indonesia, which ranks among the countries withthe highest TB burden. Fixed-dose dispersible anti-tuberculosis formulations containing rifampicin, isoniazid, and pyrazinamide are widely recommended to enhance patient adherence and minimize the risk of drug resistance. Ensuring the quality and appropriate dosage of active pharmaceutical ingredients is essential for achieving therapeutic effectiveness and maintaining TB control. This study aimed to perform routine quality assessment and regulatory compliance assays on commercialanti-TB fixed-dose combination (FDC) dispersible tablets using a reversed-phase high-performance liquid chromatography (HPLC) method as specified in the International Pharmacopoeia 2025. The HPLC system was equipped with a C18 column and used a mobile phase consisting of acetate buffer (pH 5) and methanol (94:6 v/v). System suitability testing was conducted before analysis, with %RSD values below 2%, resolution greaterthan 2.0, and tailing factors ≤ 2.0, indicating acceptable precision, selectivity, and chromatographic performance. The retention times of isoniazid and pyrazinamide were consistent with those of the reference standards, confirming identity. The assay results showed that pyrazinamide (100.3%) and isoniazid (99.9%) were within the specification limits set by the International Pharmacopoeia. These findings demonstrate that the official monograph method is suitable for regulatory-grade quality control testing of dispersible anti-tuberculosis fixed-dose combination tablets, and that the tested product met pharmacopeial quality requirements.
Revealing the Role of Mobile Phase Composition and pH in Benzoic Acid Analysis of Beverages and Processed Foods: Implications for SDG 3 Vida Zenitha Sudariasri; Meyliana Wulandari; Galuh Fathin Aulia; Susy Affrini Hutapea; Mardiana Saaid
Jurnal Riset Sains dan Kimia Terapan Vol. 12 No. 1 (2026): Jurnal Riset Sains dan Kimia Terapan, Volume 12 Nomor 1, Juni 2026
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.121.01

Abstract

To prevent health risks in excessive consumption, monitoring benzoic acid as a food additive is necessary in line with SDG 3 principles. Conventional methods for determining benzoic acid levels have limitations in selectivity and sensitivity due to matrix interference contained in food products. This study aims to determine benzoic acid levels in support of food safety monitoring in Jakarta by optimizing the mobile phase in a reversed-phase HPLC system (RP-HPLC. Reverse-phase high-performance liquid chromatography with a UV detector, investigated in this research, operated at 225 nm. A C-18 or octadecyl silica (ODS) column stationary phase (250 mm x 4,6 mm, 5 µm particle size) was used, which is classified as nonpolar. The mobile phase used is a polar methanol-phosphate buffer with a ratio 4:96 at pH 6.8. Optimization of mobile phase composition and pH was necessary to control the ionization degree of benzoic acid, improve analyte‒stationary phase interactions, and produce optimal retention time, peak shape, and resolution. The test results for benzoic acid levels in carbonated drinks, jelly drinks, and mayonnaise were 140.973 mg/kg, 232.294 mg/kg, and 710.695 mg/kg, respectively. It can be concluded that the benzoic acid levels in the sample remain below the maximum limit set by BPOM RI.
Assessment of Physical, Chemical, and Heavy Metal Parameters of Drinking Water in Specific Locations in The Ciledug Area, Tangerang City Meyliana Wulandari; Eka Noviana Safitri; Sasya Adhalya Fajra; Zahratussaadah Zahratussaadah; Widiastuti Agustina Eko Setyowati; Herlinawati Herlinawati
Jurnal Ilmu Lingkungan Vol 24, No 3 (2026): May 2026
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.24.3.%p

Abstract

Drinking water is an essential necessity for human life; however, its quality is often threatened by increasing industrial activities, urbanization, and environmental pollution. To support the achievement of Sustainable Development Goal (SDG) 6, which aims to ensure the availability and sustainable management of clean water, an evaluation of drinking water quality was conducted in some areas in Ciledug area, Tangerang City. This study aimed to assess the compliance of drinking water quality with the applicable drinking water quality standards based on physical, chemical, and heavy metal parameters. The study involved the measurement of pH, temperature, turbidity, dissolved oxygen (DO), total dissolved solids (TDS), electrical conductivity (EC), and salinity, followed by laboratory analyses of ammonia using the phenate method, phosphate using the ascorbic acid method, and Fe and Mn using Atomic Absorption Spectrometry (AAS). The results showed that six drinking water samples complied with the drinking water quality standards stipulated in the Indonesian Minister of Health Regulation No. 2 of 2023, whereas two samples (F and H) failed to comply due to high turbidity (17.9 NTU) and low pH (5.6). Ammonia concentrations were below the permissible limit of 0.5 mg/L, while one sample exceeded the limit with a concentration of 1.690 mg/L. Phosphate concentrations in all samples were below the permissible limit of 0.2 mg/L, whereas Fe and Mn were not detected. Overall, most drinking water samples complied with the quality standards. Continuous monitoring of parameters that deviate from the quality standards is necessary to ensure the provision of safe drinking water and to support the implementation of SDG 6 at the local level.
Analysis of the Effect of LEP-01 Pour Point Depressant on Crude Oil Viscosity Using Rotational Rheology Demas Aryasatya Gunawan; Fairuz Gianirfan Nugroho; Onie Kristiawan; Yusmaniar Yusmaniar; Meyliana Wulandari
Jurnal Riset Sains dan Kimia Terapan Vol. 9 No. 1 (2023): Jurnal Riset Sains dan Kimia Terapan, Volume 9 Nomor 1, Juni 2023
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.091.06

Abstract

The transportation of crude oil through pipelines is significantly influenced by its viscosity, particularly at low temperatures where wax crystals begin to form and restrict fluid flow. The use of chemical additives, such as pour point depressants (PPDs), has become an effective approach to improving the flow characteristics of waxy crude oil. This study aimed to evaluate the effect of LEP-01 pour point depressant on the viscosity of crude oil using a rotational rheology method. Crude oil samples were treated with LEP-01 at concentrations of 1000, 2000, and 3000 ppm, while untreated crude oil was used as a blank sample. Before testing, all samples were heated, mixed to achieve homogeneity, and analyzed using a rotational rheometer under controlled cooling conditions. The experimental results showed that crude oil viscosity increased as the temperature decreased due to wax crystallization. The addition of LEP-01 effectively reduced the viscosity of crude oil compared with the blank sample, with the highest concentration (3000 ppm) providing the greatest viscosity reduction. This improvement is attributed to the ability of LEP-01 to modify wax crystal growth and inhibit crystal aggregation, thereby reducing flow resistance at low temperatures. Overall, the results demonstrate that LEP-01 has considerable potential as a flow improver for maintaining crude oil flowability during low-temperature transportation and handling.
Co-Authors Achmad Tjachja Nugraha Agik Suprayogi Agustino Zulys Alfionita Octa Nur Zidni Andreas Andreas Anna Muawanah Aryani Satyaningtijas Asep Saefumillah Citra Santikasari Citra Santikasari Demas Aryasatya Gunawan Eka Noviana Safitri Erliasna, Emia Fairuz Gianirfan Nugroho Fajar Aditya Farida Ariyanti Fawziyah Sholihah Bayliz Galuh Fathin Aulia Hajar Hajar Hati, Futi Kusuma Hendrawati Hendrawati Herlinawati Herlinawati Ika Keumala Fitri Isalmi Aziz Kartika, Irma Ratna La Ode Sumarlin La Ode Sumarlin Lingga Rizal Harera Mardiana Saaid Megga Ratnasari Pikoli Mirawati Siregar Muktiningsih Nurjayadi Nofrizal Nofrizal Nofrizal Nofrizal Nofrizal Syamsudin Nurhasni, N. Nurul Amilia Nur’aini, Ruhul Aflah Onie Kristiawan Pandian Bothi Radja Pandian Bothi Raja Purnama, Yaktiva Dwi Rachmi Kartini Rahminiwati, Min Rizqy Nur Sholihat Rosi Fitri Ramadani Sasya Adhalya Fajra Shofi Nafisa Ulfa Siti Fatimah Siti Nurbaya Susy Affrini Hutapea Sutarsis Syed Azhar Syed Sulaiman Syed Azhar Syed Sulaiman Syed Azhar Syed Sulaiman, Syed Azhar Syed Tety Sudiarti Verawati Verawati Vida Zenitha Sudariasri Widiastuti Agustina Eko Setyowati Yusmaniar Yusmaniar Zahratussaadah Zahratussaadah Zahratussaadah Zahratussaadah