Penelitian ini dilakukan untuk mengetahui kandungan total fenolik dan aktivitas antioksidan pada tanaman Samama atau Jabon Merah (Anthocephallus macrophyllus) asal Ternate Maluku Utara, serta menentukan hubungan antara kandungan total fenolik dengan aktivitas antioksidannya. Ekstrak etanol diperoleh dengan cara maserasi daun Samama yang telah dikeringkan dan dipisahkan berdasarkan umur daun (muda dan tua). Penentuan metabolit sekunder ekstrak dilakukan dengan skriining fitokimia yang menunjukkan adanya senyawa alkaloid, fenolik, steroid, dan saponin. Total fenolik ekstrak ditentukan dengan metode Folin-Ciocalteu diperoleh kadar total fenolik sebesar 119,68 mgGAE/g untuk daun muda dan 210,22 mgGAE/g untuk daun tua. Aktivitas antioksidan dianalisis dengan metode DPPH diperoleh nilai IC50 80.34 µg/mL pada daun muda, dan 43.49 µg/mL pada daun tua samama. Kandungan total fenolik ekstrak daun samama dan nilai IC50-nya menunjukkan hubungan linier y = -2,4647x + 317,22 dengan nilai determinasi R2 = 0.9996

Geometric modeling and geometric optimization of Fe(III)-1,10-phenantroline (Fe-Phen), Ni II)-1,10-phenantroline (Ni-Phen) and Zn(II)-1,10-phenantroline (Zn-Phen) compounds have been carried out computing using the semi-empirical method of PM3. The spectral measurements and the study of complex electronic compositions using the UV-Vis spectrophotometer and simulation of ZINDO/s (Zerner's Neglect of Differential Overlap) calculations. The optimum result of the geometry of complex molecule found there is a change of charge in each complex with stable energy. The UV-Vis spectra measurements showed λmax in the Fe-Phen complex: 315.50 nm, Ni-Phen complex: 325.00 nm and Zn-Phen complex: 315.00 nm. The electronic transition occurring at these three complexes shows the transition characteristics of electrons at the level of the molecular orbitals π to π* and the degree of the molecular orbitals n to π⃰. Electron transition energy in complex orbital molecules can be observed in the energy changes of each molecular orbitals.

This study aimed to determine the anthocyanin content present in Flacourtia inermis peel and its ultraviolet-visible absorption potential as a dye agent. This work focused on developing dye-sensitized materials that require natural eco-friendly dyes which are easily reproducible. The red to purple colour of Flacourtia inermis peel indicates the presence of anthocyanin contents, which were derived from flavonoids. Hence, anthocyanin analysis, UV-vis absorption test and electronic transition study were conducted for information regarding the potential use Flacourtia inermis fruit peel in natural dyes. To determine anthocyanin and absorption ability, UV-visible spectrophotometry was used. Furthermore, the electronic transition of anthocyanin was determined using the semi-empirical method of ZINDO/s. The results indicate that total anthocyanin content of Flacourtia inermis peel was 10.35 mg/100 g, with UV absorption occurring at erythema transmission percent of 0.7553; the pigmentation transmission percent was 0.78696, whereas the electronic transitions of molecular orbitals were observed at an optimum wavelength 425.5 nm visible area, with intensity 1.1233. Molecular orbital levels were six, with two electronic transition shifts, namely n→π* and π→π*.

This study was conducted at the Chemistry Education Study Program, Faculty of Teacher Training and Education, Khairun University. This study aims to develop the GREATER-2T learning tool and its implementation to students' understanding of concepts in basic chemistry 1 course & teaching and learning strategies of chemistry. The population and sample in this study were all students of the chemistry education study program who programmed chemistry teaching and learning planning courses and chemical research methodology, the odd semester of the 2021/2022 academic year. Sample selection using saturated sampling technique. The method used in this research is research and development ( research and development ). The products to be developed are learning tools in the form of lecture program units (SAP), learning implementation plans (RPP), and teaching materials. The development model used by Plomp consists of 5 stages, namely: 1) initial investigation, (2) design, (3) realization/construction, (4) evaluation and revision, and (5) implementation. The research instruments were in the form of validation sheets for learning tools and teaching materials, student response assessment sheets, and concept mastery assessment instruments. Data analysis used descriptive and inferential analysis, using the SPSS software.

Telah dilakukan penelitian penerapan pembelajaran daring (dalam jaringan) menggunakan model forensik literasi (FL), pada materi kinetika reaksi mata kuliah kimia dasar. Tujuan penelitian ini adalah untuk mengetahui efektifitas dan respon mahasiswa dalam pembelajaran ini. Desain dalam penelitian ini adalah pretest dan postest one group design, dengan sampel berjumlah 31 mahasiswa dari program studi pendidikan kimia, FKIP, Universitas Khairun, Ternate. Metode untuk mengetahui efektivitas pembelajaran daring dengan FL menggunakan teknik analisis data paired sample t-test. Keaktifan mahasiswa, ketelusuran literatur dan relevansi argumentasi mahasiswa dalam pembelajaran ini dianalisis dengan metode observasi. Sedangkan respon mahasiswa terkait ketersediaan sumber daya, proses pembelajaran, motivasi belajar, aktivitas literasi, dan pendapat mahasiswa dianalisis dengan menggunakan angket. Berdasarkan analisis data hasil belajar manunjukkan adanya pengaruh antara pembelajaran daring menggunakan model FL dengan hasil belajar mahasiswa. Tanggapan mahasiswa terkait proses pembelajaran juga menunjukkan respon positif, serta mampu meningkatkan motivasi belajar mahasiswa khususnya dalam melakukan aktifitas literasi. Aktivitas literasi mahasiswa dalam pembelajaran ini juga menunjukkan tren positif dengan indikasi tingginya persentase keaktifan mahasiswa dalam mengemukakan argumentasi. Forensic literacy models in online learning in a pandemic period: Learning effectiveness and its response Abstract: Research on the Implementation of online learning using the forensic literacy (FL) model has been carried out on the reaction kinetics material of basic chemistry courses. The purpose of this study was to determine the effectiveness and response of students. This study was designed in a one-group pretest and posttest, with a sample of 31 students from the chemistry education study program, FKIP, Khairun University, Ternate. The method to determine the effectiveness of online learning with FL used the data analysis technique paired sample t-test. Student activity, literature traceability, and the student of the relevance of argumentation in this study were analyzed using the observation method. Meanwhile, student responses related to resource availability, learning process, learning motivation, literacy activities, and student opinions were analyzed using a questionnaire. Based on the analysis of learning outcomes data, it shows that there was an influence between online learning using the FL model and student learning outcomes. Student responses related to the learning process also showed a positive response and were able to increase student motivation, especially in literacy activities. Student literacy activities in this study also showed a positive trend with an indication of the high percentage of student activity in arguing.