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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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SKRINING FITOKIMIA DAN BIOAKTIVITAS RHODOMYRTUS TOMENTOSA (AITON) HASSK) (KARAMUNTING) Erwin, Erwin; Ilham, Muhammad Hafid; Pratiwi, Djihan Ryn; Alimuddin, Alimuddin
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Rhodomyrtus tomentosa (Aiton) Hassk) or known as Karamunting, is one of the medicinal plants. This medicinal plant is used by the community as a medicine for colic, fever, dysentery, sepsis, to treat shortness of breath or pain, tuberculosis, abscesses, bleeding and gynecopathy. In this study, phytochemical and bioactivity tests will be carried out on Rhodomyrtus tomentosa leaves, stem and bark extracts. Research methods include maceration of the sample with methanol, separation of the filtrate solvent obtained from the extract using a rotary evaporator, determination of chemical content using a phytochemical test, and determination of bioactivity using the brine shrimp lethality test (BSLT) method. Based on the results of phytochemical tests, it was found that the leaf extract contained alkaloids, steroids, phenolics, flavonoids, saponins and quinones. Stem extract contains alkaloids, phenolics, flavonoids, saponins and quinones. and stem bark extract contains triterpenoids, phenolics, saponins and quinones. Meanwhile, the results of the bioactivity test showed that only the leaf extract was toxic to Artemia salina shrimp with an LC50 of 582.10 ppm, while the leaf and stem bark extracts were inactive with an LC50 value above 1000 ppm. Keywords: Karamunting, BSLT test, phytochemical test, and Artemia Salina L
DISCOVERY LEARNING MODELS FOR TRAINING SCIENCE LITERACY OF STUDENTS IN COLOID MATERIALS Norbaiti, Norbaiti; Erika, Farah; Sukemi, Sukemi
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Scientific literacy ability is one of the abilities that must be mastered by students in the 21st century, to be able to solve problems in everyday life using the chemical concepts they are learning. Therefore, we need a learning that is able to relate learning material to the processes of everyday life, namely the effectiveness of the Discovery Learning model. The purpose of this research is to improve students' scientific literacy skills in colloid material. This Discovery Learning model focuses on student activities in learning with the teacher as the facilitator. The research method used was the pre-experimental method with a one-group pre-test-post-test design. The population in this study were all 52 students in class XI IPA at SMA Negeri 3 Muara Muntai in the 2022/2023 academic year, which were divided into 2 classes selected using a saturated sampling technique. The instruments used to measure students' scientific literacy skills are essay test techniques and non-test techniques in the form of student observation sheets and student response questionnaires. The results showed that the increase in students' scientific literacy skills was in the medium category with an effect size classified as a very strong category, as well as a positive response from students. Based on the research that has been done, it can be concluded that the effectiveness of the Discovery Learning learning model can increase students' scientific literacy in colloidal material. Keywords: Scientific Literacy, Discovery Learning Model, Colloid
SINTESIS NANOPARTIKEL PERAK TERMODIFIKASI KITOSAN SECARA REDUKSI KIMIA: REVIEW ARTIKEL Saputra, Aswin Caesar; Alimuddin, Alimuddin; Arif, Syaiful
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Nanoparticle is a compound particle that is synthesized in sizes ranging from 1-100 nanometers. Some things that need to be considered in the synthesis of silver nanoparticles are from their size, shape and morphology. In chemical methods, nanoparticles are made by reducing Ag+ ions, so that reducing agents and stabilizers play an important role in synthesis. Different reducing agents will affect the size of the resulting nanoparticles. Based on the literature review, a popular method used to synthesize silver nanoparticles is to use sodium borohydride as a silver nitrate reductor which has the advantage of being able to reduce and stabilize silver nitrate well, if modified with chitosan, silver nanoparticles formed will be more stable and can last longer. Based on previous research, chitosan-modified silver nanoparticles were used for antibacterial activity tests conducted against Escherichia coli and Staphylococcus aureus bacteria and for colorimetric detection of Hg2+ metal in water, where there was a color change in silver nanoparticles from yellow to colorless which showed high selectivity of chemical sensors to detect target analytes. Keywords : Silver Nanoparticles, Reducing Agents, Stabilizer, Chemical sensors.
PENGARUH ION LOGAM TERHADAP AKTIVITAS LIPASE DARI BAKTERI AIR BEKAS GALIAN TAMBANG DI SAMARINDA Haeruddin, Haeruddin; Astuti, Winni; Pratiwi, Djihan Ryn
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Addition of metal ions on lipase activity has been done. The aim of this research is to find out the effect of metal ions on lipase activity from water bacterial post mining in Samarinda. Lipase activity was determined based on the Titrimetric method with olive oil as a substrate. The result showed lipase activity from water bacterial post mining without the addition of metal ions is 1,0 U/mL and with the addition of metal ions Mg2+, K+, Fe3+, Ca2+, dan Ba2+their respective lipase activities is 0,6 U/mL, 0,7 U/mL, 1,9 U/mL, 1,4 U/mL dan 0,8 U/mL. The conclusion that can be drawn that is metal ions K+, Mg2+ and Ba2+ inhibit lipase activity with a relative activity each at 70; 60 dan 80% while Ca2+ increase lipase activity with a relative activity at 140% and Fe3+ causes denatured lipase with a relative activity at 190%. Keywords: Bacteria, Lipase, Metal Affect
PYROLYSIS OF BAGGASE WITH Ni/SBA-15 CATALYST USING PYROLYSIS GAS CHROMATOGRAPHY MASS-SPECTROMETER (Py-GC/MS) Praskianto, Ahmed Iqbal; Subagyono, R. R Dirgarini J.N.; Allo, Veliyana Londong
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Pyrolysis experiments of bagasse with catalyst Ni/SBA-15 at 350°C, 450°C and 550°C using a Pyrolysis-Gas Chromatography-Mass Spectrometer (Py-GC/MS) been done. This study aims to determine the chemical composition of the pyrolysis product of bagasse with Ni/SBA catalysis (10% w/w). Based on the percent area value of the pyrolysis product identified on the pyrogram, the chemical composition of the pyrolysis product of bagasse produced was a cellulose/hemicellulose derivative product of 45.46%-60.24% and a lignin derivative product of 32.81%-17.77% . The addition of the catalyst Ni/SBA-15 to the pyrolysis of bagasse increased the amount of cellulose/hemicellulose derivative products such as ketones and furfural and then increased the amount of lignin derivative products such as vanillin and phenol. Keywords: Pyrolysis, Baggase, Catalyst Ni/SBA-15, Py-GC/MS
SILVER NANOPARTICLES CAPPED L-Cysteine AS A MERCURY ION DETECTOR BY COLORIMETRY: A JOURNAL REVIEW Arrasyid, Rizky; Arif, Syaiful; Alimuddin, Alimuddin
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Nanoparticles are a field of research on the atomic scale with a particle size of 1-100 nm. There are many applications of nanoparticles in various fields, such as heavy metal detectors. One type of nanoparticle that can be used as a detector is L-Cysteine modified silver nanoparticles (AgNPs-L-Cys). Thus, the purpose of this review is to determine the ability of L-Cysteine modified silver nanoparticles to detect heavy metals from literature data. Based on the results of the literature, one of the heavy metals that can be detected using AgNPs-L-Cys is Hg. The color of the solution synthesized by AgNPs-L-Cys is a yellow solution. From the results of some literature, there are differences in color changes in the addition of Hg solution to AgNPs-L-Cys solutions such as changes in color from yellow to white, dark yellow to clear, and brown to light yellow. The maximum wavelengths for detecting Hg2+ metal ions from several literatures were found to be 420 nm, 410 nm, 392 nm and 390 nm. The linearity results were obtained in the range of 1-2500 nM with a relation coefficient of 0.994 and 40-1040 nM with a relation coefficient of 0.998. When compared to gold nanoparticles modified L-Cysteine (GNPs-Cys), AgNPs-L-Cys has a wider range where GNPs-Cys has a range of 100-2000 nM with a correlation coefficient of 0.9747. The LOD results obtained from several literatures were 45.39 nM and 8 nM. The % recovery results obtained from several literatures are 98.38% ± 14.1% and 91.5%∼109.1%. From these data, AgNPs-L-Cys can be used for the detection of Hg2+ metal ions with high selectivity, sensitivity, simplicity and detection speed. Keywords: Silver Nanoparticles, L-Cysteine, Mercury, Colorimetry
SINTESIS NANOPARTIKEL PERAK TERMODIFIKASI KITOSAN SEBAGAI METODE ANALISIS: REVIEW ARTIKEL Zaki, Faisal; Yusuf, Bohari; Arif, Syaiful
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Silver nanoparticles themselves have been very much developed both through the method of synthesizing silver nanoparticles both physically, chemically and biologically. In the chemical method we can do by reducing Ag+ ions into silver nanoparticles which have an attachment to the reductant and also have a very strong ability to reduce Ag+ ions to become silver nanoparticles have a small size. Based on the literature review used, the reductor is Sodium Borohydrate (NaBH4). Chitosan acts as a capping agent which functions as a stabilizer in the silver nanoparticles. Silver nanoparticles modified using chitosan from previous research, namely for activity tests as antioxidants, as metal sensors and as antibacterials Where there is a change in color on silver nanoparticles from clear to yellow. Keywords: Silver Nanoparticles, Chitosan, Reducing Agent, Stabilizer, Chemical Sensor
PERBANDINGAN PENGUJIAN VISKOSITAS LUBE OIL DENGAN MENGGUNAKAN METODE ASTM D-445 DAN ASTM D-7042 Fahmi, Miraz’hul; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Lubricant is one of the supporters so that the machine can operate optimally within a certain period of time so that the right viscosity is needed. This literature study aims to determine the appropriate method of testing the viscosity of a product. There are two different methods for testing viscosity, namely the ASTM D-445 and ASTM D-7042 methods. In this literature study, operational methods and scope of testing are compared between ASTM D-445 and ASTM D-7042 methods. Based on the results of the literature study, the ASTM D-445 method has a different method from ASTM D-7042. In ASTM D-445 it is a test to determine kinematic viscosity (ν) while in ASTM D-7042 it is a test which includes determining dynamic viscosity (η) and density (ρ). This literature study shows that the ASTM D-7042 method is very effective in the food industry, whereas the ASTM D-445 method is found to be very effective in the natural gas processing industry. Keywords: ASTM D-445, ASTM D-7042, Dynamic viscosity, Kinematic viscosity.
IDENTIFIKASI KEBISINGAN DAN PENGUKURAN INDEKS SUHU BASAH DAN BOLA (ISBB) DI LINGKUNGAN KERJA PT. GLOBAL ENVIRONMENT LABORATORY (PT. GEL) Az-zahraa, Mutiara Nur; Pasaribu, Subur P.
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Research has been carried out on finding disturbances and measuring the wet and ball temperature index (ISBB) in the PT work environment. Global Environmental Laboratory with 24 locations. Identification of disturbances is measured using a sound level meter based on Ministerial Decree. Environment Number 48/MENLH/11-. /1996 and ISBB measurements using a heat stress monitor based on SNI 7061-2019 concerning Work Climate Measurement and Evaluation. The method used is quantitative primary data collection (based on numerical). This primary data is based on the results of disturbance measurements and ISBB values ​​which are then processed into secondary data. The secondary data that has been obtained is then analyzed and calculated. The aim is to determine the value of disturbance intensity and ISBB in the PT work environment. Global Environment Laboratory based on Minister of Industry Regulation Number 5 of 2018 concerning the Threshold Value for Physical Factors and Chemical Factors in the Workplace is 85 dBA and the heavy workload category is 27.5%. The research results show that the disturbance intensity and ISBB values ​​are below the NAB which does not endanger workers while at PT. Global Environmental Laboratory. Keywords: Noise, ISBB, NAB
SKRINING FITOKIMIA DAN POTENSI ANTIBAKTERI EKSTRAK ETANOL DAUN SIRIH HUTAN (Piper aduncum L.) TERHADAP BAKTERI Escherichia coli DAN Staphylococcus aureus : A MINI REVIEW Sanjaya, I Made Duwi; Purba, Ritson; Saleh, Chairul
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Sirih hutan is a plant that belongs to the genus Piper and is found in many tropical areas, especially in tropical Asia. Sirih contains essential oils composed of betlephenol, cavikol, sesquiterpenes, hydroxycavikol, cavibetol, estragol, eugenol, and carvakrol which against Gram positive bacteria and Gram negative bacteria. Antibacterial activity test of ethanol extract of sirih hutan (Piper aduncum L.) has been conducted. This study aims to determine secondary metabolite compounds contained in sirih hutan leaves and potential as antibacterials, determined using the disc diffusion method. From the results of phytochemical tests, secondary metabolite compounds contained in sirih hutan are obtained in the form of alkaloids, steroids, phenolics, flavonoids, tannins, quinones and saponins. The results of the literature showed that sirih hutan leaf ethanol extract had antibacterial activity with the highest concentration used at 60% and the diameter of the inhibitory zone formed in Escherichia coli and Staphylococcus aureus was 14 mm. Keywords : Antibacterial, Forest Betel, Phytochemical Screening

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