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Hydrogen: Jurnal Kependidikan Kimia
Published by Universitas Pendidikan Mandalika
ISSN : 23386487     EISSN : 26563061     DOI : Prefix 10.33394
Core Subject : Science, Education,
Chemistry Education
Hydrogen: The Chemistry Education Journal published by the Chemistry Education Study Program which contains articles raised from the results of conceptual research and studies in chemistry and chemistry education including education and learning, device development, media and learning models.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 618 Documents
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Review of Secondary Metabolites From Melandean Bark Extract (Bridellia Micrantha): Bioactive Potential and Applications in Health Bayani, Faizul; Muhali, Muhali; Yuliana, Devi; Hulyadi, Hulyadi; Gargazi, Gargazi
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.11956

Abstract

Abstract The emergence of various diseases affecting the immune system, such as COVID-19 and Hand, Foot, and Mouth Disease, demands serious attention. Current climate changes occurring in almost all parts of the world can lead to the emergence of various viruses and bacteria that cause multiple diseases. Exploring medicinal plants that can enhance the immune system is crucial to be continued. This study aims to identify secondary metabolite compounds contained in Bridellia Micrantha plants using chemical reagents and gas chromatography-mass spectrometry (GC-MS) instruments. This research is an experimental laboratory study. The variable studied is the content of secondary metabolite compounds. Data were collected using chemical reagents and instruments. The obtained data are described in informative tables and graphs. Based on the identification results using instruments, positive results were found for organic compound groups such as flavonoids, alkaloids, and tannins. GC-MS test results showed that the organic compounds  contained in Bridellia Micrantha extract are 43.05% hexadecanoic acid, 21.46% oleic acid, 16% docos-13-enoic acid, 3.89% octadecanal, 1.85% propanediol, and 0.91% trans-phytol. Literature reviews indicate that the organic acids in Bridellia micrantha extract have clinical activities as antioxidants and anti-inflammatory agents, while organic compounds containing hydroxyl groups have clinical activities as anti-cancer agents. Based on these findings, Bridellia micrantha extract has the potential as a medicine that can enhance the body's immunity.  
Student Perceptions of Science Subjects at State Vocational Schools in Central Lombok Regency Asrorul Azizi; A. Wahab Jufri; M. Sarjan; Yunita Ariansani; Joni Rokhmat; AA Sukarso
Hydrogen: Jurnal Kependidikan Kimia Vol 11, No 6 (2023): December 2023
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v11i6.8816

Abstract

Vocational High School (SMK) is an education that prepares students to become professionals according to their program of expertise. In addition to learning science in vocational education subjects, which is something new, the previous vocational subject curriculum did not study science. The purpose of this study was to describe students' perceptions of science learning at State Vocational High School (SMKN) 1 Praya, SMKN 1 Pujut , and SMKN 1 West Praya. This research includes descriptive research. The sample in this study was 20% of the tenth grade students of Paiwisata Vocational High School in Central Lombok district, totaling 37 students SMKN 1 Praya, 25 students of SMKN 1 Pujut, and 26 students of SMKN 1 West Praya . Sampling was done by simple random sampling, and the instrument used for data collection was a questionnaire. The data analysis technique used is percentage. Students' Perceptions of Research Results in Science Lessons show a percentage of 74.02% with sufficient criteria. It can be concluded that students' perceptions of learning science meet sufficient criteria.
Identification of Antioxidant Activity of Bridelia Micrantha Bark Using the DPPH Method Bayani, Faizul; Rosmayanti, Baiq; Hamdani, Ade Sukma; Bimaharyanto, Deden Eka; Hulyadi, Hulyadi
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11346

Abstract

This research aims to identify the antioxidant activity of Bridelia micrantha stem bark using the DPPH method. This research is a laboratory experimental research. Antioxidant activity was measured using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. Melandean Bark Extract is made using the maceration method with 80% methanol solvent. Identification of antioxidant activity was carried out at concentrations of 20 ppm, 40ppm, 60ppm, 80ppm, and 100ppm. Vitamin C was used as a positive control. Absorbance measurements were carried out using a UV-Vis spectrophotometer at a wavelength of 517nm. The test results in this research showed that the IC50 value of melandean bark extract was 85.54 ppm. Melandean bark extract is classified as a strong antioxidant.
Identification of Secondary Metabolite Compounds from Melandean (Bridelian micrantha) Leaf Extract Faizul Bayani; Baiq Anting Kurniasari; Ade Sukma Hamdani; Depi Yuliana; Ida Wahyuni; Jamilul Mujaddid
Hydrogen: Jurnal Kependidikan Kimia Vol 11, No 6 (2023): December 2023
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v11i6.9879

Abstract

The Melandean plant or Bridelia micrantha (Hochst.) Baill is traditionally used by the community to treat various human diseases, such as poisoning, paralysis, digestive diseases, diabetes, syphilis, and other diseases. Bridelia micrantha is believed to have active chemical compounds in the form of secondary metabolites which are useful for treatment. This active chemical compound is contained in the roots, leaves, seeds, skin, stems, and fruit. Bridelia micrantha leaves were used as samples in this study to analyze the secondary metabolite compounds contained therein. Leaf extraction was carried out using 80% methanol solvent through a maceration process. Analysis was carried out qualitatively using the phytochemical screening test method and quantitatively using the thin layer chromatography test method. Based on the results of the phytochemical screening test carried out, it is known that Bridelia micrantha is positive for containing active compounds in the form of flavonoids, tannins, saponins, and alkaloids. The results of the thin layer chromatography (TLC) test showed that flavonoid compounds were found with an Rf value of 0.437, tannin compounds with an Rf value of 0.312, saponin compounds with an Rf value of 0.625, and alkaloid compounds with Rf values of 0.125, 0.187, 0.312 and 0.5.
Advancement in Green Synthesis of Titanium Dioxide : Photocatalytic and Larvicidal Activities – A review Deliza, Deliza; Safni, Safni; Zein, Rahmiana; Putri, Reza Audina
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10655

Abstract

Nanotechnology is a fast expanding field with several applications in science, engineering, healthcare, pharmaceutical, and other areas. Nanoparticles (NP) are frequently produced through a variety of physical and chemical methods. Recently, green synthesis technologies that are more simple, sustainable, and cost-effective have been developed. The environmentally friendly/sustainable synthesis of titanium dioxide nanoparticles (TiO2 NPs) has been in great demand in the previous quarter. Bioactive components found in organisms, such as plants, facilitate the processes of bio-reduction and restriction. This review described green synthesis of TiO2 NPs, the photocatalytical uses, and managing the larvicidal activity of disease-spreading mosquitoes. Various natural reducing agents including proteins, enzymes, phytochemicals, and others, are involved in the synthesis of TiO2 NPs. Current research findings and future concerns in a viable platform based on biologically meditated TiO2 nanostructures for industrial applications.
Development of LKPD based on project-based learning oriented chemo-entrepreneurship on hydrocarbon material for phase F SMA/MA Velly, Aglin; Suryani, Okta
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.12442

Abstract

This development research was conducted to develop a teaching material in the form of a project-based learning worksheet (LKPD) based on chemo-entrepreneurship-oriented learning on hydrocarbon material for phase F SMA / MA. The validity and level of practicality will be known. The type of research used is educational design research (EDR) with the Plomp development model which has three stages, namely preliminary research (initial investigation), prototyping phase (prototype formation stage), and assessment phase (assessment/testing). However, the assessment phase was not carried out in this study where the research was carried out until the results of the validity and practicality of the LKPD were obtained. The validity test was conducted by 3 chemistry lecturers at FMPA UNP and 2 chemistry teachers at SMAN 3 Padang using a validity questionnaire sheet. Practicality was conducted by 2 chemistry teachers and 9 students of phase F SMAN 3 Padang. The results of the study based on the validity test showed an average Aiken'V 0.87 with a valid category and based on the practicality test showed an average of 90% by students with a very practical category and 94% by teachers with a very practical category. The research results of project-based learning-based LKPD oriented chemo-entrepreneurship on hydrocarbon material for phase F SMA / MA have been valid and practical.
Pengembangan Model Pembelajaran Sains Berorientasi Literasi Sains bagi Mahasiswa Calon Guru Kimia Tulus Junanto; Rody Putra Sartika
Hydrogen: Jurnal Kependidikan Kimia Vol 11, No 5 (2023): October 2023
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v11i5.8886

Abstract

Pendidikan sains memiliki peran yang penting dalam menyiapkan siswa memasuki dunia kehidupannya. Tujuan yang ingin dicapai dalam penelitian ini adalah a) mendeskripsikan peningkatan aktivitas belajar siswa menggunakan metode pembelajaran pendekatan sains teknologi masyarakat (STM) yang berorientasi literasi sains, b) mengembangkan metode pembelajaran pendekatan sains teknologi masyarakat (STM) yang berorientasi literasi sains, c) mendeskripsikan efektifitas pengembangan metode pembelajaran pendekatan sains teknologi masyarakat (STM) yang berorientasi literasi sains. Metode penelitian ini adalah Education Research and Development (R&D) yaitu penelitian dan pengembangan. Penelitian dan pengembangan (R&D) dikhususnya pada pembelajaran IPA pada pengembangan metode pembelajaran pendekatan sains teknologi masyarakat (STM) yang berorientasi literasi sains. Berdasarkan hasil penelitian, model pembelajaran berorientasi literasi sains dinilai layak oleh pakar model pembelajaran karena sesuai dengan memenuhi kriteria model pembelajaran. Model pembelajaran ini praktis berdasarkan nilai kepraktisannya karena terstruktur jelas dan praktisi juga dapat dengan mudah menggunakannya. Model pembelajaran berorientasi literasi sains efektif diterapkan. Hal ini dapat dilihat dari nilai kelas ekperimen yang lebih baik dibandingkan nilai kelas kontrol.
Development of Electronic Student Worksheets Assisted with Wizer.me on Redox Reactions Learning Pamenang, Fransisca Ditawati Nur; Ngetje, Brigita Febrisilia
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10322

Abstract

Student worksheets serve as valuable teaching materials facilitating students' learning processes by expanding information on the targeted study topics. In the context of learning redox reactions, Depok 1stState Senior High School exclusively utilizes printed student worksheets. This research focuses on developing electronic student worksheets assisted by the Wizer.me platform for redox reaction material in class, aiming to enhance the efficacy of the learning materials. The research employs a Research and Development (R&D) method, utilizing the 4D development model modified to 3D. Instruments such as interview sheets, validation sheets, and questionnaires were employed, with a sample comprising 10 students from 10th grade. Data analysis was conducted descriptively. The results of the research indicate that 4D models were instrumental in developing electronic student worksheets due to their clearly directed steps or procedures. The developed product exhibits high validity, scoring an average of 84% for both the media and material aspects, with a content validity coefficient exceeding 0.8. Students responded positively to the student worksheet products, rating them high in design (82%), operational and visual communication (83%), resulting in an overall average score of 83%, classified as very practical. The developed product proves effective in supporting the learning of redox reactions.
Synthesis of Colorimetric Sensor for Cyanide Detection with Iron(III) Chloride reagent Using Sol Gel Method with Smarthphone Combination Rohsaita, Amalia; Thohir, Muhammad Bakhru; Surya Efendi, Meilisa Rusdiana; Kusumaning Tiyas, Windi Pangesti; Nursaida, Marta Citra
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.11887

Abstract

Sensor untuk mendeteksi ion sianida (CN - ) telah berhasil dilakukan dengan metode sol-gel menggunakan prekursor tetraetil ortosilikat dan pereaksi FeCl3. Penelitian ini bertujuan untuk mengetahui kondisi optimal sintesis, kondisi optimal sensor, menentukan LoD dan LoQ. Sintesis dilakukan dengan mencampurkan prekursor dengan pelarut etanol. Selanjutnya ditambahkan H2O, Triton X-100, reagen dan katalis ke dalam campuran. Variasi yang dilakukan adalah konsentrasi reagen dan waktu penuaan terbaik. Hasil sensor dinyatakan dalam nilai Euclidean Distance (ED) titik Merah-Hijau-Biru (RGB) yang diperoleh. Kondisi optimal untuk penyensoran dilakukan dengan memvariasikan waktu kontak. Pada sintesis sol gel konsentrasi reagen terbaik diperoleh pada konsentrasi 0,1 M dan waktu penuaan terbaik adalah 4 hari. Penentuan kondisi sensor optimal terjadi pada waktu 30 detik dengan batas pencucian 120 detik. Validasi metode sensor menghasilkan linearitas pada rentang konsentrasi 100 – 1000 ppm dengan nilai R 2 sebesar 0,9984. LoD dan LoQ masing-masing sebesar 65,45 ppm dan 218,16 ppm. Karakterisasi sensor menggunakan spektrofotometer FTIR dari bilangan gelombang 4000 sampai 400 cm-1. Spektrum IR yang dihasilkan menunjukkan keberhasilan dalam sintesis sol-gel, karena pada penelitian ini SiO2 muncul pada bilangan gelombang sekitar 433 cm-1. Setelah tahap sensor dengan merendam sensor pada analisa CN - 0,01 M dan CN - 0,1 M tidak ada tanda-tanda munculnya gugus Fe-S pada bilangan gelombang 4000-400 cm-1, karena daerah serapannya berada pada 380- 311 cm -1.
Chemical Composition Analysis of Citrus×limon (L) Osbeck Leaf Essential Oil and Its Activity as an Anti-Cervical Cancer Agent Afif, Iffat Syafiqoh; Suryati, Suryati; Santoni, Adlis
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 1 (2024): February 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i1.10772

Abstract

Cervical cancer is a life-threatening disease. The use of synthetic drugs for its treatment can have serious adverse effects on the body. Therefore, it is necessary to search for natural drugs that are safe for the body. One of the secondary metabolites contained in plants is essential oils (EO), EO are known to have activity as anti-cervical cancer. Genus Citrus is known for containing EO compounds, one of the species of the genus is Citrus×lemon (L) Osbeck. The purpose of this study is to identify the chemical components of the EO isolated from the leaves of C×limon and to evaluate its cytotoxic activity against cervical cancer. EO was isolated from C×limon leaves collected in Padang City, Indonesia using the hydrodistillation method. EO was then analyzed by GC-MS. To determine its cytotoxicity, BSLT was conducted, followed by molecular docking and MTT assays. The experiment yielded a yellow liquid with a density of 0,8684 g/mL and a yield of 0,181%. GC-MS analysis of the EO identified 56 chemical components, with the main compounds are (-)-β-pinene (7.32%), (-)-limonene (28.40%), geranial (5.54%), caryophyllene (5.22%). The EO showed high toxicity against Artemia salina L larvae, with an LC50 value of 3,697 µg/mL. Through molecular docking, it is known the (-)-limonene, geranial, (-)β-pinene and caryophyllene compounds as the main compounds in of EO are known to bind to form complexes with cervical cancer proteins (HPV18E6). MTT assay showed weak cytotoxic activity of EO against HeLa cells, with an IC50 of 218.9 µg/mL.

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