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INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 502 Documents
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STUDI PIROLISIS MIKROALGA (Spirulina platensis) TERHADAP KONSENTRASI PRODUK TURUNAN KARBOHIDRAT Qosim, Assyfa Machmudah; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
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

Pyrolysis study of microalgae Spirulina platensis using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. In the pyrolysis product of microalgae Spirulina platensis, the chemical composition of carbohydrate-derived products was 10.70%. The carbohydrate-derived product compounds produced were 2-methyl-propanal, phenol, and 1-hydroxy-2-propanone. Keywords: Spirulina platensis, pyrolysis, Py/GC-MS
PEWARNAAN SERAT DAUN DOYO MENGGUNAKAN PEWARNA ALAMI DARI EKSTRAK DAUN KETAPANG Nursilawati, Nursilawati; Awaliyah, Nabilah Nailah; Pakaenoni, Frederich; Larasati, Herlin Alfiana; Hartandi, Dimas; Rahmadani, Agung; Wirhanuddin, Wirhanuddin; Sukemi, Sukemi
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

Ulap Doyo is a traditional woven fabric of the Dayak Benuaq tribe in East Kalimantan. Ulap Doyo is made from doyo (Curculigo latifolia) leaf fibers with the base color of whitish cream. Natural dye is used to create patterns. Ketapang (Terminalia catappa L.) leaves contain tannins that can be used as natural dyes. This study aimed to determine the color change of doyo leaf fibers dyed using aqueous ketapang leaf extract. The natural dye was extracted by decoction technique with distilled water as solvent. Tannin content was analyzed using phytochemical tests and permanganometric titration. The dyeing process used the dye bath technique at 92°C of dyeing temperature, 1:100 (w/v) of MLR, and 135 minutes of dyeing time. Before dyeing process, the extract and fibers were treated using 5 mL of 1 M acetic acid (AA) and 5 mL of 1 M ammonia (Am). The color change of the dyed fibers: untreated fiber - untreated extract (UF-UE), treated fiber - untreated extract (TFAA-UE, TFAm-UE), untreated fiber - treated extract (UF-TEAA, UF-TEAm), and treated fiber - treated extract (TFAA-TEAA, TFAm-TEAm) were measured using ImageJ application and shown in term of ∆I. This research results shows that the extract was dark brown solution with 0,280 ± 0,001 % (w/w) of tannin content. The color shade of the dyed doyo leaf fibers is pale brown to brown. The treatment of the extract using acetic acid (UF-TEAA) produce the highest colour shade and ∆I value. This study shows that the ketapang leaf extract can be used as dye for ulap doyo. Keywords : ulap doyo, Curculigo latifolia, Terminalia catappa L., dyeing bath technique
BIOPRODUKSI SENYAWA KIMIA ANTIDIABETES OLEH ISOLAT KAPANG ENDOFIT KUMIS KUCING (Orthosiphon spicatus B. B. S.) Sulastri, Lilik; Kartika, Rudi; Simanjuntak, Partomuan
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

Kumis kucing plant (Orthosiphon spicatus B. B. S.) are one of the plants that have been used as diuretic, antidiabetic and antihypertensive drugs. Identification of chemical compounds, and antidiabetic activity assay of bioproduction of endophytic fungi with code B.Os.1F that isolated from the stems of kumis kucing have been carried out. Two fermentation methods (dynamic and static fermentation) to determine the pH. The tlc profile analysis and pH showed that B.Os.1F isolate by dynamic fermentation for 12 days had the potential to produce chemical compounds as antidiabetics at pH 4 ~ 6. The product of fermentation are extracted with ethyl acetate, then fractionated by column chromatography (SiO2): (i) n-hexane-ethyl acetate [10:1 ~ 1:1]; (ii) chloroform-methanol (20:1 ~ 1:1) based on “bioassay guided fractionation” with a-glucosidase enzyme inhibition assay. The isolate of B.Os.1F.2-3 had an activity of 76 %, and identify based on UV-Vis, Fourier-Transform Infra Red (FT-IR) spectroscopies and gas chromatography-mass spectrometer (GC-MS) are estimated to be Ergosta-5,7,9(11),22-tetraen-3-ol compounds. Keywords : Endophytic fungus, Orthosiphon spicatus B.B.S., α-glucosidase enzyme, ergosta-5,7,9(11),22-tetraen-3-ol.
STUDI PIROLISIS MIKROALGA HIJAU (Spirulina platensis) TERHADAP KONSENTRASI PRODUK TURUNAN KLOROFIL Mardiani, Evi; Subagyono, RR Dirgarini Julia Nurlianti; Allo, Veliyana Londong
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

Pyrolysis study of green microalgae (Spirulina platensis) using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. In this study, the Spirulina platensis microalgae used had a moisture content of 8.34% and an ash content of 7.18%. Pyrolysis of Spirulina platensis microalgae at 450˚C produced chlorophyll derivative products of 6.20%. Keywords : Spirulina platensis, pyrolysis, Py/GC-MS
ANALISIS NILAI TOTAL SULFUR (TS) DAN CALORIFIC VALUE (CV) DALAM BATUBARA MENGGUNAKAN METODE AMRERICAN STANDARD TESTING AND MATERIAL (ASTM) DI PT GEOSERVICES SAMARINDA KALIMANTAN TIMUR Novianti, Rina Lia; Sitorus, Saibun; Hiyahara, Irfan Ashari
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

Coal is a crucial energy source with varying quality levels. It is formed by the accumulation of organic sediments mixed with carbon, resulting from the diagenesis process of plant elements. This study aims to determine the Total Sulfur (TS) and Calorific Value (CV) of coal, which are essential factors in assessing coal quality and economic value. The American Standard Testing and Material (ASTM) method is employed to ensure consistency and standardization in the analysis. From an analysis of six samples, the total sulfur content was determined to be 1.98% for sample A, 1.88% for sample B, 2.06% for sample C, 0.14% for sample D, 0.70% for sample E and 0.18% for sample F. Additionally, the calorific value were determined to be 6267 Cal/g for sample A, 6126 Cal/g for sample B, 6234 Cal/g for sample C, 5189 Cal/g for sample D, 4986 Cal/g for sample E and 3917 Cal/g for sample F. Based on the total sulphur analysis sample D, sample E and sample F can be used in the cement burning process because their total sulphur content is less than 0.8%. Meanwhile, based on the calorific value analysis sample A, sample B and sample C can be used the cement burning process because their calorific value above 6000 Cal/g. Keywords : Coal, total sulphur, calorific value, American Standard Testing and Material.
ISOLASI SENYAWA AKTIF DARI LABAN (VITEX PINNATA) TUMBUHAN OBAT ASLI KALIMANTAN TIMUR DAN KALIMANTAN UTARA SEBAGAI BAHAN KOSMETIK Purba, Ritson; Azizah, Amanda Salwa Nur; Maulidawati, Rista
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

Laban (Vitex pinnata), a natural medicinal plant of East and North Kalimantan, was the subject of an isolation process to produce active chemicals. This study uses a chromatography column with a solvent gradient system to carry out the fractionation or isolation process. The crude plant extract is first fractionated using a solvent with the least polarity, n-hexane, and then additional solvent is added. The goal is to ascertain the anti-bacterial and antioxidant activity of plant isolates as well as obtain pure compounds and describe the properties and structure of isolated compounds. Previously, an extract known as Laban (Vitex pinnata) extract was utilized. This plant was isolated, and the isolation yield for Laban (Vitex pinnata) was 85.06%. The chromotography column for Vitex pinnata is done by mixing a sample of 10 grams of Vitex pinnata leaf extract with a 37.5 gram sample of silica and then inserting it into the saturated chromotography column. The isolates were tested for their antioxidant activity and anti-bacterial P.acne (anti-acne). Test of antioxidant were determined by their antioxidant activity through the DPPH free reduction mechanism with 3 repetitions control. The test was using a UV-Vis spectrophotometer at a temperature of 25°C with a wavelength of 514 μm. Keywords: isolation, antioxidant, P.acne bacteria, cosmetics.
STUDI PIROLISIS MIKROALGA HIJAU (Spirulina platensis) TERHADAP KONSENTRASI PRODUK TURUNAN LIPID Sahirah, Nabilah Sinar; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
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

Pyrolysis study of Spirulina platensis using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. In the pyrolysis products identified on the pyrogram, the chemical composition of lipid-derived products was 55.70%. These lipid-derived compounds are hexadecanoic acid (31.05%), oleic acid (6.06%), and octadecanoic acid (3.68%). Keywords: Spirulina platensis, pyrolysis, Py/GC-MS
ANALISIS PEMETAAN MINAT MENJADI GURU PADA MAHASISWA CALON GURU KIMIA FAKULTAS KEGURUAN DAN ILMU PENDIDIKAN UNIVERSITAS MULAWARMAN Syafira, Irmaina; Hartati, Yuli; Erika, Farah
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

Someone who has an interest in becoming a teacher will feel happy with their job as a teacher without needing encouragement from other parties. Not all chemistry education study program students aim to become teachers after completing their studies. Many students enter the education department without having a definite desire to become teachers in the future after graduating. This research aims to determine the mapping of interest in becoming a teacher among prospective chemistry teacher students at the Faculty of Teacher Training and Education, Mulawarman University. This research is descriptive qualitative research. The subjects in this research were 68 chemistry education students at Mulawarman University class of 2019. Data were collected using a questionnaire. The data analysis technique used is descriptive analysis technique using percentages. Based on the research results, a mapping of interest among prospective chemistry teacher students was obtained from those who were interested, not interested and who were unsure. Keywords: Teacher, College Student, Interest, Interest in Becoming a Teacher
MINI REVIEW: PERBANDINGAN AKTIVITAS ANTIOKSIDAN BEBERAPA SPESIES DAUN SIRIH (Piper sp.) DAN POTENSINYA SEBAGAI TABIR SURYA Ningrum, Tika Setia; Purba, Ritson; 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

The betel plant (Piper sp.) is a vine that is often used as a medicine or traditional potion. The part that is generally used as medicine is the leaves. Betel leaves can be used as an antiseptic, anti-dyslipid agent, anti-fungal, anti-inflammatory, anti-bacterial and antioxidant. The antioxidants in betel leaves can be used as sunscreen because they can reduce free radicals from exposure to sunlight. Antioxidant activity was tested using the DPPH (2,2 diphenyl-1-picryhydrazyl) method. In this article, a review of the antioxidant activity of various species of betel leaves is carried out, such as green betel leaves (Piper bettle), forest betel (Piper aduncum), Chinese betel (Pepperomia pellucida), yellow betel (Piper betle), and black betel (Piper acre). The results of the literature study show that the highest IC50 value is found in forest betel leaves (Piper aduncum) at 47.252 ppm and the lowest in black betel leaves (Piper acre) at 10.41 ppm. Based on that, the betel leaf that has the best antioxidant activity and potential as a sunscreen is black betel leaf (Piper acre). Keywords: Antioxidants, Betel Leaves, Sunscreen
KOMPOSIT HIDROKSIAPATIT DARI CANGKANG TELUR DENGAN TiO2 SEBAGAI KATALIS DALAM PROSES ADSORPSI METHYLEN BLUE Lutfiana, Ayu; Cahyadi, Setiawan; Luthfiyah, Luthfiyah; Qolbiah, Iftatun; Jelsy, Jelsy; Putri, Noni Khaisha; Widiyowati, Iis Intan
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

Hydroxyapatite (HAp) is an inorganic compound composed of calcium (Ca) and phosphate (PO43-). This compound is useful for removing colored liquid waste and becomes an environmentally friendly adsorbent. HAp sources are very abundant and have high economic value, one of which is eggshells. Eggshells contain 94% calcite compound, this compound contributes to the mechanical properties and strength of HAp. HAp has unique properties of high ion exchange and adsorption, high thermal stability, and non-toxicity, but there are shortcomings of HAp namely poor mechanical properties and brittleness. A way to improve the mechanical strength of HAp is to composite it with metals. This study was designed to determine the adsorption ability of hydroxyapatite (HAp/TiO2) composite from eggshell against methylene blue. In this study, the synthesis of HAp using hydrothermal method with eggshell material through the calcination process with a temperature of 1000°C obtained the results of CaO which will be synthesized into pure HAp and the results of HAp will be composited with TiO2 metal. The results of HAp/TiO2 are used to adsorb methylene blue with several variations, namely mass, pH, concentration, and time. From the various variations obtained results for the optimum mass variation of 0.125 grams, the optimum contact time at 4 hours, and for the optimum concentration with pH 9, and at a concentration of 100 ppm provides maximum adsorption results against methylene blue. Keywords : Hydroxyapatite; Composite; Adsorption; Methylene Blue

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