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INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
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Articles 502 Documents
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AKTIVITAS DAN ISOLASI SENYAWA BIOAKTIF DARI EKSTRAK ETIL ASETAT DAUN TEH (Camellia sinensis (L.) Kuntze) SEBAGAI PENGHAMBATAN ENZIM α-GLUKOSIDASE Nuraini Saadah; Lilik Sulastri; Syamsoedin Abdilah; Partomuan Simanjuntak
PROSIDING SEMINAR KIMIA Vol 1 No 2 (2023): Prosiding SNKT II 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Tea (Camellia sinensis (L.) Kuntze) is one of the plants that has compounds that have the potential as inhibitors of the α-glucosidase enzyme. The purpose of this study was to know the activity of chemical compounds in the ethyl acetate extract of tea leaves as an inhibitor of the α-glucosidase enzyme. Extraction tea leaf was carried out by maceration tea leaf powder in ethanol 96% 3 times, then partitioned with ethyl acetate and water. The ethyl acetate extract obtained was determined by the inhibitory activity of the -glucosidase enzyme, then fractionated by column chromatography (SiO2; n-hexane: ethyl acetate 10:1 ~ 1:1) yielding 10 fractions (CSEA-1 ~ CSEA-10). The CSEA-2 fraction was further fractionated by column chromatography (SiO2; n-hexane: ethyl acetate 20:1 ~ 1:1) yielding 9 fractions (CSEA-2.1~ CSEA-2.9). The results showed that the ethyl acetate extract had activity with an IC50 value of 45.04 ppm, the fractionated CSEA-2.1 subfraction had an IC50 value of 41.51 ppm with acarbose as a comparison of 19.24 ppm. The conclusion is that the CSEA-2.1 subfraction has better activity than the extract in inhibiting the α-glucosidase enzyme and can be used as an alternative candidate for diabetes drugs. Keywords: Camellia sinensis (L.) Kuntze, tea, α-glucosidase enzyme inhibitor, Indonesian medicinal plant, IC50
ANALISIS KEBUTUHAN PENUNTUN PRAKTIKUM SEBAGAI BAHAN PENUNJANG PEMBELAJARAN KIMIA BERBASIS KETERAMPILAN PROSES SAINS Maryam Jamilah; Nurfajriani Nurfajriani; Ramlan Silaban
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The education system is expected to be able to prepare a learning system that is in accordance with the development of students' career needs. The system can be developed based on skills and competencies that students will also need in the future, especially in science process skills. This study aims to analyze the need for a practicum guide as a support for science process skills-based learning. The type of research conducted is descriptive qualitative research with the Research and Development (R&D) method with the ADDIE development model. The research variables include an analysis of teaching needs and an analysis of the suitability of Core Competencies (KI) and Basic Competencies (KD) to determine competency indicators (GPA) which will be a reference in developing practical instructions based on science process skills. Research shows that the practicum guides currently used are limited to students' ability to follow procedures and do not provide opportunities for students to design predetermined experiments. Based on the results of these studies, it can be concluded that it is necessary to develop a practical guide based on science process skills as a support for the success of chemistry learning both in product, process, and performance skills. Keywords: Practical guidelines, Science Process Skills, R&D, ADDIE
PEMBUATAN KOMPOSIT Fe3O4-AMPAS KOPI SEBAGAI ADSORBEN METHYLENE BLUE Ummi Nor Hidayah; Teguh Wirawan; Soerja Koesnarpadi
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Synthesis of Fe3O4-coffee grounds as an adsorbent for methylene blue has been carried out. This study aims to determine the optimum contact time, optimum pH and maximum adsorption capacity and to determine the type of adsorption isotherm on methylene blue adsorption using Fe3O4-coffee grounds composite. This research method was carried out experimentally. The first step was the synthesis of the Fe3O4-coffee grounds composite using the coprecipitation method with a mass ratio of FeCl3.6H2O: (NH4)2Fe(SO4)2.6H2O: Coffee ground (2:2:7). The next step is to determine the optimum contact time, optimum pH and maximum adsorption capacity. The concentration of methylene blue was analyzed using a UV-Vis Spectrophotometer. The results obtained for determining the optimum contact time is 20 minutes with the optimum pH at pH 8 and has a maximum adsorption capacity of 79.85 mg/g. The type of adsorption isotherm follows the Langmuir adsorption isotherm. Keywords: Fe3O4-Coffee Grounds Composite, Adsorption, Methylene blue
PENGEMBANGAN E-MODUL BERBASIS DISCOVERY LEARNING MENGGUNAKAN MOODLE KELAS X SEMESTER GENAP Ika Sundari; Nurfajriani Nurfajriani; Marini Damanik
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

This stuy aims to develop e-modules for class X high school student and to obtain innovative e-modules for even semester of class X high school students. The research method develop (R&D) using the ADDIE floating model. The subject and location of this research in class X SMA Swasta Harapan is located in Langkat. The instrument used in the BNSP instrument with four criteria namely content feasibility,language,graphic and presentation. The BNSP instrument is used to determine the suitability of the e-module that has been developed is assessed as a validator expert. From the result of the e-module validator based on discovery learning using moodle class X even semester,totality value is 4,20 with a valid category without revision. After the e-module was developed , it wa obtained average very suitable for use of 3,86 category very suitable for use in class X even semester Keyword: Development, E-modul,Discovery Learning, Moodle
PEMODELAN SETTLING POND UNTUK PENURUNAN PENCEMARAN KIMIA-FISIK AIR LIMBAH PERTAMBANGAN BATUBARA Saibun Sitorus; Wahyudin M.
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Making a variety of settling ponds in coal mining is one of the models for reducing the burden of wastewater pollution. This settling pond variation modeling aims to evaluate the ability to reduce the pollution load of wastewater based on chemical quality. The settling pond variation model consists of 3, namely settling pond model 1, model 2 and model 3. The method in this study is descriptive qualitative. Based on the results of the study, the reduction of pollution load on model (1) was 2% (0.0031 kg / second), for model (2) 1.21% (0.4281kg / second) and model (3) 1% (0.0074 kg / second). Actual Pollutant Load -BPA at the settling pond variation site is smaller compared to the Maximum Pollutant Load-BPM (BPA<BPM). Actual pollutant load of settling pond variations (1) 0.107 kg/second, (2) of 0.032 kg/second and (3) 0.105 kg/second. Maximum Pollutant Load (BPM) settling pond (model 1) 0.165 kg/sec, (model 2) 2.01 kg/sec and (model 3) 0.628 kg/sec. The decrease in the load of pollutants in the settling pond is influenced by several factors including vegetation, distance of the source of the pollutant (catchment area) with the settling pond, dimensions of the settling pond (retention pond), the process of giving coagulants, topography, type of lithology. Keywords: Settling pond modeling, pollution reduction, polluting load, Chemical-physical
MINI-REVIEW: PEMBUATAN DYE-SENSITIZED SOLAR CELLS (DSSC) MENGGUNAKAN SEMIKONDUKTOR TIO2 DENGAN BANTUAN ZAT PEWARNA ALAMI Muhammad Irvan Mulya Pratama; Veliyana London Allo; Noor Hindryawati
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The availability of energy sources such as coal and oil is getting thinner every year. Sunlight is one of the most abundant sources of energy on earth. Solar cells can convert this energy into electricity and over time, dye-Sensitized solar cells (DSSC) have the potential to be developed because they have good efficiency. However, the use of synthetic dyes is difficult to obtain and is toxic because it contains heavy metals. Therefore, natural dyes are used as alternative materials in the fabrication of DSSC. The purpose of this article is to review the results of research on DSSC using natural dyes. The method used in this research is the literature review method. The results of the literature review show that the DSSC made with TiO2 semiconductor and natural dyes has a good efficiency of about 0,592 %. Natural dyes can be obtained by extracting plants containing anthocyanins, curcumin and chlorophyll such as red cabbage, turmeric and pandan leaves, what's interesting is that using 2 different types of natural dyes will produce higher efficiency than 1 type of dye. In addition, treatment factors such as dye extraction, the amount of TiO2 used and the length of immersion into the dye also affect the efficiency of the DSSC. Keywords: DSSC, natural dyes and efficiency
UJI FITOKIMIA DAN TOKSISITAS TERHADAP ARTEMIA SALINA DARI EKSTRAK METANOL JARINGAN DAUN MANGROVE RHIZOPHORA MUCRONATA Ma’rifatul Jannah; Usman Usman
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Mangrove plants can produce bioactive compounds that have the potential to be developed into medicinal plants. Mangrove Rhizopora mucronata is one of the mangrove species that has bioactive compounds. This study aims to determine the content of secondary metabolites by conducting phytochemical tests and toxicity tests on Artemia salina (shrimp larvae) in the methanol extract of Rhizopora mucronata mangrove leaves. The sample used was Mangrove Rhizopora mucronata obtained from sambera mangrove trees from Muara Badak, East Kalimantan. Extraction was carried out using the maceration method, where samples of Rhizopora mucronata mangrove leaves were extracted with methanol for 3 x 24 hours. The methanol extract obtained was evaporated using a rotary evaporator. Furthermore, the methanol viscous extract was carried out by phytochemical test using color test method and toxicity test using BSLT. Based on the results of phytochemical tests, the methanol extract of mangrove leaves Rhizopora mucronata contains alkaloids and saponins. The toxicity of the methanol extract of Rhizopora mucronata mangrove leaves is in the moderate category with an LC50 of 48,165 ± 52,25 ppm. Rhizopora mucronata mangrove leaf extract contains active compounds that have the potential to be developed as alternative and anticancer drugs Keywords: Mangrove Rhizopora mucronata, methanol extract, active chemical content, toxicity
PENGEMBANGAN DAN VALIDITAS E-MODUL INOVATIF NONLOGAM OKSIGEN DAN SULFUR BERBASIS KKNI Elsa Febrina Tarigan; Nurfajriani Nurfajriani; Zainuddin Muchtar
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The development of teaching materials must pay attention to the prerequisites of the National Education Standards Agency (BSNP) and under the curriculum in universities to achieve subject learning. Educators make innovations to create interesting sources of teaching materials. This research aims to produce an innovative e-module for non-metallic oxygen and sulfur. This study uses the ADDIE model where only three stages are used, namely Analysis, Design, and Development. The data collection instrument used a validation questionnaire per the BSNP given to material and media expert validators. The results showed that the electronic feasibility test of the KKNI-based modules (Indonesian National Qualifications Framework) that had been developed obtained average content feasibility of 3.49 (valid), language eligibility of 3.67 (valid), presentation eligibility of 3.62 (valid), and eligibility Graphics is 3.66 (valid) with an overall average of 3.56 which is included in the valid category which can be used as non-metallic oxygen and sulfur teaching materials based on KKNI. Keywords: e-Modules, Innovative Chemistry, Teaching Materials.
SINTESIS DAN KARAKTERISASI MATERIAL SILIKA MESOPORI SBA-15 DENGAN ULTRASONIC ASSISTED SOL-GEL METHOD MENGGUNAKAN PELARUT ASAM ASETAT Siti Sarah; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Synthesis and characterization of mesoporous silica material SBA-15 with ultrasonic assisted sol-gel method using acetic acid solvent has been conducted. The mesoporous silica material SBA-15 was characterized by N2 adsorption/desorption Analysis, Small Angle X-Ray Diffraction (SAXRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR). SBA-15 material resulted from the calcination method for template removal has a surface of 876 m2/g, a pore volume of 5,1 cm3/g and a pore diameter of 1,13 nm. The SAXRD pattern of SBA-15 showed three distinctive peaks with Miller indeces of 100, 110 and 200 respectively. The morphology of the SBA-15 material has the form of aggregate particles with a reguler cylindrical structure on the particles. Infrared spectra of SBA-15 showed the presence of functional groups, namely Si-O-Si, Si-OH and –OH. Keywords: Mesoporous silica, SBA-15, sonication
PENGEMBANGAN E-MODUL TITRASI ASAM BASA BERBASIS BLENDED LEARNING DENGAN APLIKASI KVISOFT FLIPBOOK MAKER Nurhayani Nurhayani; Ramlan Silaban; Moondra Zubir
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

This study aims to determine the expert team's assessment of acid-base titration e-module based on blended learning with the kvisoft flipbook maker application by BSNP (Badan Standar Nasional Pendidikan). The research type used is research and development modified from development ADDIE (Analysis, Design, Development, Implementation, and Evaluation) model. This research is only used until product validation. The data sources in this research were 2 expert validators. The results showed that the expert team's assessment of the acid-base titration e-module based blended learning with the kvisoft flipbook maker application by BSNP on the aspect content feasibility had an average percentage value of 86%, language feasibility of 88%, and presentation feasibility analysis of 85% and concluded that the media was very feasible to use and didn’t need to be revised. Keywords: E-module, acid-base titration, blended learning, kvisoft flipbook maker

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