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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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MINI REVIEW: PEMBUATAN ESI ASAM PEROKSIDA (H2O2) DARI KAWAT TERSALUT AgNPs TERMODIFIKASI KITOSAN Suriyani, Suriyani; Alimuddin, Alimuddin; Arif, Moh Syaiful
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

This mini-review discusses the development of peroxide acid (H₂O₂) ion-selective electrodes (ISE) from chitosan-modified AgNPs-coated wires. The review highlights the importance of AgNPs in enhancing electrocatalytic activity and conductivity, which are crucial for the development of high-performance electrochemical sensors. Chitosan is used as a stabilizing agent for AgNPs due to its biocompatibility and chemical stability. The coated wire-type ion-selective electrodes are utilized because this method has advantages such as rapid and accurate analysis, high selectivity, no need for separation, a wide measurement range, and low analysis costs. The methodology used in this study involves gathering information from various literature, which is then compiled into detailed case studies. This review aims to integrate information on the modification of AgNPs with chitosan for the development of new ion-selective electrodes (ISE) capable of efficiently detecting H₂O₂. Keywords: H₂O₂, Wire-Coated ISE, AgNPs Modified with Chitosan
DEPOLIMERISASI LIMBAH POLIETILEN TEREFTALAT (PET) MENJADI ASAM TEREFTALAT (SUMBER LINKER MOF-5) DENGAN METODE HIDROLISIS ASAM BASA Mid, Arsy Aprilia; Syaima, Husna; Hindryawati, Noor
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

Terephthalic acid is an important ligand in the manufacture of MOF-5 which has been obtained from the depolymerization of PET (polyethylene terephthalate) recycled from PET plastic waste. Depolymerization of PET polymers into terephthalic acid ligands (linkers) is carried out using the acid-base hydrolysis method at room temperature using H2SO4 and NaOH. The yield was obtained at 40.95% (8.19 grams). PET monomers in the form of terephthalic acid were then tested by Thin Layer Chromatography (TLC) using n-hexane and ethyl acetate solvents (1:2). The TLC results showed the same stain spot between depolymerized terephthalic acid and commercial terephthalic acid. Depolymerized terephthalic acid and commercial terephthalic acid were then analyzed using Fourier Transform Infrared (FTIR) which showed the presence of functional groups C=O, C-O, C-H, and O-H and analyzed with a UV-Visible Spectrophotometer and obtained a maximum wavelength in both materials of 306 nm. Keywords: Terephthalic Acid, depolymerization, polyethylene terephthalate
REVIEW ARTIKEL: SKIRINING FITOKIMIA DAN AKTIVITAS FARMAKOLOGIS TANAMAN KRATOM (Mitragyna speciosa Korth) Aina, Nur; Saleh, Chairul; Marliana, Eva
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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Kratom (Mitragyna speciosa korth) is one of the plants found in forest areas in Indonesia. Phytochemical screening and pharmacological activity of kratom plants (Mitragyna speciosa Korth) have been conducted. Some studies show kratom plants contain secondary metabolites, namely alkaloids, flavonoids, saponins, triterpenoids, tannins and terpenoid-steroids. Literature studies show kratom leaves have strong antioxidant activity with IC50 values <50 ppm. Kratom leaves have antinonceptive activity in the dichloromethane fraction at doses of 70 mg/kgBB (51%), 140 mg/kgBB (81%) and 280 mg/kgBB (86%). Antimicrobial activity against staphylococcuc pidermidis bacteria with a concentration of 5% (7.23 mm) 10% (10.50 mm), 15% (11.78 mm), 20% (12.63 mm) and 25% (13.69 mm). Stems and roots of kratom plants have antibacterial activity against propionibacterium acnes bacteria, stem concentration 5% (5.71 mm ± 0.40), 10% (6.75 mm ± 0.26) and 15% (6.78mm ± 0.29), on roots 5% (5.4 mm ± 0.12), 10% (5.8 ± 0.08) and 15% (6.21 mm ± 0.36). Anti-inflammatory activity with a dose of kratom extract 0.5 mg/grBB (46.37 mm ± 10.04), 1 mg/grBB (32.33 mm ± 11.24), 2mg/grBB (26.69 mm ± 6.57). Acute toxicity test in the reflux method LC50 value of 71.08 ppm while the maceration method LC50 value of 143, 50 the results shown are included in the toxic category. Keywords: Mitragyna speciosa korth, Mitragyna, phytochemical screening
REVIEW ARTIKEL: POTENSI LIDAH BUAYA (Aloe vera (L.) Burm. f.) SEBAGAI BAHAN DASAR PEMBUATAN EDIBLE FILM/COATING Mayang, Julia Agustin; Pasaribu, Subur P.; Panggabean, Aman Sentosa
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

Plastic is a very common packaging material in the food industry, due to its practicality, durability, and flexibility. However, its negative impact on the environment has prompted efforts to find more environmentally friendly alternatives. One promising solution is the development of edible films and coatings, which are made from edible materials and have biodegradable properties. Aloe vera has become an interesting material in the development of edible films and coatings due to its beneficial active compounds. This article conducts a review of the existing literature on the manufacture of aloe vera-based edible films and coatings. The literature review method was used to collect relevant information from various online sources. The results showed that aloe vera edible films and coatings have great potential in food packaging, because they are not only environmentally friendly and edible, but can also improve the quality and shelf life of food products. With the addition of additional ingredients such as gelatin, chitosan, starch, alginate, PVA, and CMC, the antimicrobial, antioxidant, and antifungal properties of the films and coatings can be enhanced. The use of aloe vera edible coatings has also been shown to affect the chemical, physical, and sensory properties of coated food products. In conclusion, the use of edible films and aloe vera coatings is promising as a sustainable alternative in food packaging, as they can increase protection of food products without compromising product safety or quality. Keywords : Aloe vera (L.) Burm.f.), edible films, edible coatings
STUDI DEKOMPOSISI TERMAL PIROLISIS Spirulina platensis DENGAN LAJU PEMANASAN 15 °C/MENIT Utami, Devira Ulva; 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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Thermal decomposition study of Spirulina platensis pyrolysis with heating rate of 15°C/min was conducted. Microalgae pyrolysis was carried out with a thermogravimetric analyzer (TGA) instrument. This research focused on analyzing the thermal decomposition process of Spirulina platensis which has a moisture content of 8.34% and ash content of 7.18%. Thermal decomposition of Spirulina platensis occurs in 3 stages, namely water evaporation at temperatures ≤ 140°C; active pyrolysis with a temperature range of ±147-502°C involving thermal decomposition of carbohydrate compounds, proteins and lipids; and passive pyrolysis with temperatures ≥ 502°C, where the remains of more stable organic components were decomposed. Keywords: Spirulina platensis, thermogravimetric analysis, and decomposition
ADSORPSI ZAT WARNA RHODAMIN B MENGGUNAKAN KOMPOSIT Fe3O4-AMPAS KOPI Astuti, Resky Widya; Alimuddin, Alimuddin; Syaima, Husna
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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Adsorption of Rhodamin B Dye with Fe3O4-Coffee Grounds Composite has been carried out. The purpose of this study is to determine the optimum time, optimum pH, maximum adsorption capacity and type of adsorption isotherm in rhodamin B dye with Fe3O4-Coffee grounds composite. The first stage of making Fe3O4-Coffee grounds composite using the coprecipitation method with FeCl3‧6H2O and Fe(SO4)2‧7H2O was weighed with a molar ratio of 3:2, then combined with coffee grounds. The results showed that the optimum time was obtained at 20 minutes, at the optimum pH at pH 10, and the maximum adsorption capacity obtained was 40.19 mg/g. The results of the determination of the type of isoterm in the adsorption of rhodamin b were obtained by the type of Langmuir isoterm. Keywords: Rhodamine B, Adsorption, Composite Fe3O4-coffee grounds
REVIEW ARTIKEL: NANOPARTIKEL PERAK TERMODIFIKASI L-Cysteine UNTUK ANALISIS ION LOGAM BESI(II) Wijayanti, Alvina Nuril; Alimuddin, Alimuddin; Arif, Moh. Syaiful
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

Silver nanoparticles are silver metal with nano size (<100 nm). Silver nanoparticles are widely researched because they have wide applications in everyday life. The method often used to synthesize silver nanoparticles is the bottom-up method. The principle of this method is the reduction reaction of Ag+ ions to Ag0, which is in the form of silver nanoparticles. Based on the literature, the selection of an appropriate reducing agent greatly influences the size and stability of the resulting nanoparticles. Highly reactive reducing agents that are often used include: ascorbic acid, trisodium citrate and sodium borohydrate. Modification of silver nanoparticles using L-Cysteine functions as a capping agent/stabilizer which has been proven to be stable for up to 3 months. Silver nanoparticles modified with L-Cysteine function as a chloramphenicol sensor, which is characterized by a color change from yellow to brown. This color change occurs due to the aggregation of silver nanoparticles which is triggered by the interaction between silver nanoparticles and chloramphenicol. Keywords : Silver nanoparticles, L-Cysteine, capping agent.
PIROLISIS MIKROALGA Spirulina platensis MENGGUNAKAN THERMOGRAVIMETRIC ANALYZER DENGAN LAJU PEMANASAN 20℃/MENIT Madani, Nabila Mutiara; Subagyono, RR. Dirgarini Julia Nurlianti; Kassim, Mohd. Asyraf
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 of microalgae Spirulina platensis using a thermogravimetric analyzer with a heating rate of 20℃/min was carried out. The thermal decomposition pattern and temperature range of active and passive pyrolysis of Spirulina platensis pyrolysis are the focus of this study. Based on the analysis, the water content and ash content of green microalgae Spirulina platensis were 8.34% and 7.18%. The decomposition pattern in Spirulina platensis pyrolysis is divided into three stages, namely water evaporation occurs at temperatures ≤ 150 ℃, the main devolatilization stage or active pyrolysis occurs in the temperature range 155 - 536 ℃ and the passive pyrolysis stage occurs at temperatures ≥ 536 ℃. Keywords: Spirulina platensis, Pyrolysis, and Thermogravimetric Analysis.
VERIFIKASI METODE PENENTUAN KADAR AMONIA SEBAGAI NITROGEN (NH3-N) DALAM SAMPEL AIR BERSIH DENGAN METODE HACH 8155 DI PT BADAK NGL BONTANG Yusuf, Irfan Maulana; Pasaribu, Subur P.; Panggabean, Aman Sentosa
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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The research about method verification for determination of ammonia levels as nitrogen (NH3-N) in clean water samples using the Hach 8155 method at PT Badak NGL Bontang has been done. Method verification was carried out by testing several verification parameters such as linearity tests, determining of instrumentation detection limits, detection limits of the method, quantification limits, repeatability, reproducibility and accuracy. The research results showed that the linearity test had good results with a correlation coefficient (R2) was 0.9992; instrumentation detection limit value was 0.01 mg/L; method detection limit value was 0.01 mg/L; quantification limit value was 0.03 mg/L; the repeatability value obtained from %RSD is less than 2/3 of the Horwitz CV; reproducibility value was 0.497 obtained from the Zscore value with acceptance requirements, namely 1.96 ≥ Zscore ≥ -1.96; and the accuracy value of the measured levels was 0.483 with a concentration range limit of 0.364 – 0.533 mg/L. The research results show that the Hach 8155 method can be used as a routine analysis method at PT. Badak NGL. Keywords : Method verification, ammonia, clean water, Hach 8155 method.
KAJIAN LITERATUR PEMANFAATAN ADSORBEN KITOSAN TERMODIFIKASI ARANG AKTIF LIMBAH ORGANIK TERHADAP LOGAM BERAT Arsyakia, Tarisa; Koesnarpadi, Soerja; Lianasari, Ika Yekti
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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A literature review on the utilization of chitosan adsorbent modified organic waste activated charcoal against heavy metals has been conducted. From the results of the study, it was obtained that organic waste activated charcoal still has chemical content in the form of cellulose, lignin, hemicellulose, carboxymethyl cellulose ranging from 33.61-65,7%. The carbon compounds formed ranged from 66.60-86.4%. The organic waste activated charcoal used includes coffee grounds; tea grounds; teak wood powder; coconut shell; durian peel waste; pineapple peel waste; salak fruit seed waste; and rubber fruit shell. Activated charcoal is modified with chitosan to optimize pores, expand the surface, and increase adsorption power. The modification process is by mixing chitosan with a certain weight and dissolving it in 1-3% CH3COOH, then adding activated charcoal with a certain weight, stirring until a homogeneous gel is formed. Next, it was baked at 60ºC for 24 hours. The results formed were mixed into NaOH with a certain concentration, then washed with distilled water until neutral and stored in a desiccator. The chitosan - activated charcoal adsorbent was then contacted with heavy metals Arsenic (As); Lead (Pb); Cadmium (Cd); Copper (Cu); Zinc (Zn); and Iron (Fe). The results obtained percent absorption and adsorption capacity ranged from 85.32-99.992% and 0.1236-177.7035 mg/g. The values of percent absorption and adsorption capacity are influenced by the surface area, concentration, and adsorbent that needs to be activated. Keywords : Activated Charcoal, Chitosan, Modification, Heavy Metal

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