cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota samarinda,
Kalimantan timur
INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 502 Documents
 31   32   33   34   35 
UJI FITOKIMIA DAN AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL JARINGAN BUAH TANAMAN BINTARO (Cerbera manghas) Meysi Yulianti; Usman Usman
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Bintaro plant (Cerbera manghas) is a plant that contains toxin, especially in the fruit which contains the toxic compound cerberin. However, even though it contains poison, the fruit of the bintaro plant also has the potential as an antioxidant. The purpose of this study was to determine the secondary metabolite compounds and antioxidant activity of the methanol extract of the fruit of the bintaro plant. Phytochemical test analysis was carried out by means of a color test, including the test for alkaloids, flavonoids, phenolics, steroids, triterpenoids, saponins and tannins. As for the antioxidant activity test using the DPPH method by measuring the absorption at a wavelength of 517 nm. The results of the phytochemical test showed that the methanol extract of the fruit of the Bintaro plant contained alkaloid, phenolic and triterpenoid compounds. Then the results of the antioxidant activity test of the methanol extract of the fruit of the Bintaro plant has an IC50 value of 87,013 ± 0.022 ppm. Based on the IC50 value, it can be concluded that the methanol extract of the fruit of the Bintaro plant has antioxidant activity with a strong category. Keywords: Antioxidant, bintaro fruit, phytochemical test
UJI AKTIVITAS ANTIMIKROBA HASIL BIOPRODUKSI KAPANG ENDOFIT DAUN LIDAH MERTUA (Sansevieria trifasciata Prain) Lea P. Retnoningsih; Shirly Kumala; Marlin M. Raunsai; Partomuan Simanjuntak
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Secondary metabolite from Lidah mertua’s leaves (Sansevieria trifasciata Prain) had reported antimicrobial activity. The aim of this study is to determine the fractions of secondary metabolite produced by endophytic fungi of Lidah mertua’s leaves which potential to be antibacterial agent against Staphylococcus aureus and Escherichia coli. Rejuvenated endophytic fungi in Potato Dextrose Agar (PDA) fermented in Potato Dextrose Yeast (PDY) for 14 days, extracted with ethyl acetate obtained F.A and F.B extract from filtrat and B extract from biomass. F.A and B extract fractionated with coloumn chromatography ( SiO2; n-heksan – ethyl acetate and dichlorometana – methanol) obtained 8 fractions from filtrate extract (F.A-1 ~ F.A-8) and 5 fractions from biomass extract (B-1 ~ B-5). Anti-pathogenic bacterial tests used the KLT-bioautography dot-blot and elusion methods. Fraction F.A-1 ~ F.A-8 and F.B extract showed antimicrobial activity against S. aureus InaCC-B4 and E. coli InaCC-B5. Fraction B-1 ~ B-5 showed antimicrobial activity against S. aureus but the B-5 fraction were not showed antimicrobial activity againts E.coli. The fraction that has the potential to be a broad-spectrum antibacterial is the fraction F.B. Keywords: antimicrobial activity test, bioproduction, endophytic fungi, Lidah mertua’s leaves, Sansevieria trifasciata Prain.
OPTIMASI KONSENTRASI L-Cysteine PADA MODIFIKASI SINTESIS NANOPARTIKEL PERAK (AgNPs) DENGAN L-Cysteine Cindi Fitria Nisaul Khasanah; Alimuddin Alimuddin; Moh. Syaiful Arif
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Modification of Synthesis of Nanoparticles with L-Cysteine ​​functions as a capping agent/stabilizer, so that the nanoparticles can last longer. Modification of nanoparticle synthesis by adding L-Cysteine ​​to AgNPs and homogenizing it using a magnetic stirrer. Modification of nanoparticles (silverAgNPs) was monitored by observing the visible uptake. The results showed that the absorbance value increased by indicating the concentration of L-cysteine ​​5x10­-5; 6x10-5; 7x10-5; 8x10-5; 9x10-5; 1x10-4 and the volume of L-cysteine ​​is 4 mL.
PEMBUATAN DAN KARAKTERISASI EDIBLE FILM GALAKTOMANAN DARI BUAH NIPAH (Nypa fruticans Wurmb) DENGAN INKORPORASI EKSTRAK METANOL DAUN TAHONGAI (Kleinhovia hospita L.) SEBAGAI ANTIOKSIDAN Shintia Alifah R; Subur P. Pasaribu; Erwin Erwin; Aman Sentosa Panggabean
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Fabrication and characterization of edible films from galactomannan nipah fruit (Nypa fruticans Wurmb) with the incorporation of methanol extract of tahongai leaf (Kleinhovia hospita L.) as an antioxidant has been conducted. This study aims to determine the best concentration of methanol extract of tahongai leaves to increase the antioxidant activity of edible films using the DPPH (1,1-diphenyl-2-picrylhydrazyl) method. The results showed that the edible film containing galactomannan 1.5%, glycerol 25% and methanol extract of tahongai leaves with concentrations of 0%, 1%, 2%, 3% and 4% showed antioxidant activity with IC50 values of 224.02 mg/L, 215.82 mg/L, 153.51 mg/L, 129.48 mg/L and 107.87 mg/L respectively. The concentration of incorporation of methanol extract of tahongai leaves to produce the best edible film is 3% which increases antioxidant activity when compared to edible films without incorporation with properties having a moisture content of 15.04%, thickness of 0.21 mm, water vapor transmission of 43.70 g/m2/hour and SEM (Scanning Electron Microscopy) analysis showed the surface morphology was homogeneous and slightly rough. Keywords : Edible film; Galactomannan; Tahongai leaves; Antioxidant activity
EFEKTIVITAS KOMPATIBILISER LLDPE-g-AO DALAM CAMPURAN POLI ASAM LAKTAT (PLA)/LINEAR LOW-DENSITY POLYETHYLENE (LLDPE) TERHADAP SIFAT FISIS DAN MEKANIS Nengsi Handayanti Gaho; Ahmad Hafizullah Ritonga
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Semi-biodegradable plastic is an alternative that is currently being developed in order to reduce environmental pollution due to excessive use of commercial plastics and produce plastics that have physical and mechanical capabilities that are almost the same (not much different) with commercial plastics. However, the problem that arises is the low compatibility of mixtures with different polarities on the physical and mechanical strength of semi-biodegradable plastics. This study aims to determine the effectiveness of the addition of a linear low-density polyethylene grafting oleic acid (LLDPE-g-AO) compatibility to a mixture of poly lactic acid (PLA) and linear low-density polyethylene (LLDPE) in terms of physical and mechanical properties tests. The mixing of PLA and LLDPE was carried out through a blending method with a solvent system, where PLA used chloroform, LLDPE and the LLDPE-g-AO compatibilizer used xylene, which was followed by the addition of 1% glycerol in the mixing of the two resulting solutions. The results of this study indicate that the addition of LLDPE-g-AO effectively resulted in an increase in the mechanical strength and water absorption of the PLA/LLDPE mixture. The results of testing the mechanical properties of the most optimum tensile strength is the mixture of PLA/LLDPE/LLDPE-g-AO (70:22.5:7.5) which is 3.8078 MPa with the results of the physical properties test for absorption of 3.66 %. Keywords: PLA, LLDPE, LLDPE-g-AO, tensile strength, water adsorption
POTENSI TUMBUHAN OBAT DARI PULAU KARIMUN BESAR, KEPULAUAN RIAU SEBAGAI AGEN ANTIOKSIDAN DAN ANTIBAKTERI Marlin Megalestin Raunsai; Dewi Wulansari; Andi Saptaji Kamal; Andria Agusta
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The discovery and development of medicinal plants from plants is interesting to study, including as an antioxidant and antibacterial agents for human health. This research is motivated by global problems related to degenerative diseases and antibiotic resistance which continue to increase. The purpose of this study was to determine the antibacterial and antioxidant activity of medicinal plants collected from Karimun Island, Riau Islands. Ten ethanolic plant extracts consisting of leaves, stems, roots, and rhizomes were extracted using the maceration method. In the antioxidant test, the methods used were TLC Bioautography and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging. The results showed that 10 samples were active in reducing DPPH free radical. Quantitative test with DPPH showed 5 samples, namely stems of Dendrophthoe pentandra (Host: Timonius flavescens), roots of Ximenia americana, leaves and stems of Dendrophthoe pentandra (Host: Mangifera indica), and leaves of Rhodomyrtus tomentosa, have a very strong antioxidant activity with AAI values​of 8.32, 4.03, 2.68, 3.90, and 3.39, consecutively. The method used for the antibacterial test was TLC Bioautography and Microdilution against Escherichia coli and Staphylococcus aureus bacteria. A total of 7 extracts inhibited the growth of S. aureus. In a further test to determine the value of Minimum Inhibitory Concentration (MIC), Rhodomyrtus tomentosa leaf extract showed a moderate antibacterial activity with a MIC value of 128 μg/ml. It can be concluded that some plant extracts from Karimun Island, Riau Islands have the potential as a source of antioxidants and antibacterials. Keywords: medicinal plants, Karimun Island, antibacterial, antioxidant
PIROLISIS SERBUK KAYU ULIN (Eusideroxylon zwageri) DENGAN INSTRUMEN PYROLYSIS-GAS CHROMATOGRAPHY-MASS SPECTROSCOPY Sri Astika Putri; RR Dirgarini Julia Nurlianti Subagyono; Rahmat Gunawan
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pyrolysis of Ulin sawdust (Eusideroxylon zwageri) with pyrolysis-gas chromatography-mass spectroscopy (Py-GC/MS) instrument haw been performed. This study was conducted to determine the chemical composition resulting from the pyrolysis process of Ulin sawdust (Eusideroxylon zwageri) using the Py-GC/MS instrument. Pyrolysis was performed at a temperature of 350 oC, 450 oC and 550 oC under the flow of helium gas (He). The chemical composition of the product resulting from the pyrolysis process of Ulin sawdust was lignin derivative products of 56-73%, cellulose/hemicellulose derivative products of 17-22%. The pyrolysis products with the highest per cent were Phenol,4-ethenyl-2,6-dimethoxy-; .beta.-D-Glucopyranose,1,6-anhydro; and isoelemicin. Keywords: Pyrolysis, Eusideroxylon zwageri, Py-GC/MS
ADSORPSI METHYLENE BLUE MENGGUNAKAN ADSORBEN ASAM FULVAT (AF) DARI TANAH GAMBUT SAMBOJA KALIMANTAN TIMUR Fransiska Febriani; Soerja Koesnarpadi; Ika Yekti Liana Sari
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Research on the adsorption of methylene blue with fulvic acid (AF) adsorbent from peat soil has been carried out. The initial stage is the extraction of AF from the peat soil of the Samboja area of East Kalimantan. Extraction was carried out with a solution of 1 M NaOH and 12 M HCl(p). The results obtained a yellow-brown solid fulvic acid. The optimization of methylene blue adsorption by AF was obtained, namely a contact time of 120 minutes at pH 3 and an optimum concentration of 40 mg/L and an adsorption capacity of 0.98 mg/g. Keywords: Adsorption, fulvic acid, methylene blue
AKTIVITAS SENYAWA BIOAKTIF DARI EKSTRAK ETIL ASETAT DAUN YAKON (Smallanthus sonchifolius) SEBAGAI PENGHAMBAT ENZIM α-GLUKOSIDASE Riska Diana; Lilik Sulastri; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Yakon (Smallanthus Sonchifolius) leaves in Indonesia, better known as insulin leaves, scientifically have various properties and one of them is antidiabetic. This study aims to determine the activity of secondary metabolites contained in the ethyl acetate extract of yakon (Smallanthus Sonchifolius) leaf as an inhibitor of the -glucosidase enzyme. Yakon leaf ethyl acetate extract using eluent from TLC results. Until several sub-factions are obtained. These sub-fractions were combined in TLC and tested for activity. The sub-fraction with the best activity in Back column chromatography and TLC and tested until the IC50 value is obtained. The results showed that the ethyl acetate extract of yakon leaves had inhibitory activity of the -glucosidase enzyme with an IC50 of 45,67 ppm. The results of column chromatography separation showed that sub-fraction 6.5 was a sub-fraction with an IC50 value of 42,23 ppm. Conclusion: Yakon leaf ethyl acetate extract had better activity than purified F6.5 and acarbose as a positive control with an IC50 value of 21,36 ppm. Keywords : Smallanthus sonchifolius, α -glucosidase inhibitory enzyme, IC50, Indonesian medicinal plant
PIROLISIS SERBUK KAYU MERANTI (SHOREA) DENGAN INSTRUMEN PYROLYSIS-GAS CHROMATOGRAPHY-MASS SPECTROSCOPY Miranda Miranda; RR Dirgarini Julia Nurlianti Subagyono; Rahmat Gunawan
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A study on the pyrolysis of meranti (Shorea) sawdust using a pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) instrument was carried out. This research was conducted to determine the chemical and physical characteristics of meranti (Shorea) sawdust and to determine the chemical composition of the meranti (Shorea) pyrolysis product. Pyrolysis was carried out with three different temperature variations, namely 350°C, 450°C and 550°C. Meranti wood powder (Shorea) has a moisture content of 12±0.001%, an ash content of 0.07±0.017%, a -cellulose content of 66%, a lignin content of 35±0.047% and a hemicellulose content of 2%. Based on the percentage of product area in the pyrolysis pyrolysis, meranti (Shorea) sawdust contains lignin derivative products (29-50%) and cellulose/hemicellulose derivative products (7-17%). The pyrolysis product with the highest percent area was carbamic acid monoammonium salt. (E)-2,6-Dimethoxy-4-(prop-1-en-1-yl)phenol. Phenol, 4-ethenyl-2,6-dimethoxy-. Acetic acid. Ammonium acetate. Butanenitrile, 3-oxo- and Beta.-D-Glucopyranose, 1,6-anhydro. Keywords: Pyrolysis, Py-GC/MS, Meranti wood powder (Shorea)

Page 33 of 51 | Total Record : 502

 31   32   33   34   35 

Filter by Year

2013 2025


Reset
Filter By Issues
All Issue Vol 4 No 1 (2025): Prosiding SNK 2025 Vol 3 No 2 (2025): Prosiding SNKT 2024 Vol 3 No 1 (2024): Prosiding SNK 2024 Vol 2 No 2 (2024): Prosiding SNKT III 2023 Vol 2 No 1 (2023): Prosiding SNK 2023 Vol 1 No 2 (2023): Prosiding SNKT II 2022 Vol 1 No 1 (2022): Prosiding SNK 2022 2021: SEMINAR NASIONAL KIMIA 2021 Prosiding SNKT Himpunan Mahasiswa Kimia FMIPA UNMUL 2021 2020: Prosiding Seminar Nasional Kimia Berwawasan Lingkungan (SNK-BL) 2020 Seminar Nasional Himpunan Mahasiswa Kimia 2020 SEMINAR NASIONAL KIMIA 2019 SEMINAR NASIONAL KIMIA 2018 SEMINAR NASIONAL KIMIA 2017 PROCEEDING OF INTERNATIONAL CONFERENCE 2015 SEMINAR NASIONAL KIMIA 2014 SEMINAR NASIONAL KIMIA 2013 More Issue