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ALCHEMY Jurnal Penelitian Kimia
Published by Universitas Sebelas Maret
ISSN : 14124092     EISSN : 24434183     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
ALCHEMY Jurnal Penelitian Kimia is a chemistry journal published by Sebelas Maret University, Surakarta. ALCHEMY Jurnal Penelitian Kimia publishes original research articles or review articles in organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry, and environmental chemistry.
Arjuna Subject : -
Articles 14 Documents
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Search results for , issue "Vol 20, No 1 (2024): March" : 14 Documents clear
TiO2-N/Polystyrene photocatalyst-combined Corona Plasma Treatment for Methylene Blue Degradation Kusumandari Kusumandari; Ahmad Qusnudin; Teguh Endah Saraswati; Davit Dhruv
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 1 (2024): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.1.76692.62-69

Abstract

This study employed the corona plasma method combined with TiO2-N/PS photocatalyst to degrade dye pollutants. The plasma reactor consisted of two needle-shaped stainless steel electrodes connected to a voltage of 8 kV. Methylene blue (MB) solution was used as a model pollutant with varied initial concentrations of 10, 50, and 100 ppm. The degradation efficiency was evaluated based on the absorbance of the degraded MB solution measured using a UV-Vis spectrophotometer. The results exhibited that the longer plasma treatment duration caused the absorbance value of the degraded MB to decrease, and then the MB degradation efficiency increased. MB-10 demonstrated a maximum degradation efficiency of 99.40% after plasma treatment for 30 minutes. Meanwhile, MB-50 and MB-100 reached maximum degradation efficiencies of 95.29 and 86.55% efficiency after plasma treatment for 60 minutes. The greater initial MB concentration caused the longer degradation process. Furthermore, the results revealed no increase in degradation efficiency due to the addition of TiO2-N/PS photocatalyst into the plasma treatment. The degradation efficiencies of MB-10, MB-50, and MB-100 under TiO2-N/PS-combined plasma treatment for 30 min were 94.48, 81.57, and 5.22%, respectively. This suggests the possibility that the UV light generated during the plasma process cannot activate the TiO2-N/PS photocatalyst.
Pengaruh Variasi Konsentrasi Gliserol pada Ekstraksi Glukomanan dari Umbi Porang (Amorphophallus oncophyllus) Triana Kusumaningsih; Melinia Puspita Prahastiwi; Venty Suryanti
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 1 (2024): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.1.79438.138-150

Abstract

Kandungan glukomanan yang tinggi pada umbi tanaman porang (Amorphophallus oncophyllus) telah menjadikannya sebagai salah satu sumber glukomanan potensial di Indonesia. Glukomanan yang dikenal dengan kandungan gulanya yang rendah, dapat menjadi makanan pengganti beras yang sehat. Penelitian ini berfokus pada ekstraksi glukomanan menggunakan gliserol, penentuan kadar proksimat, dan penilaian kadar kalsium oksalat dalam glukomanan. Gliserol cairan yang tidak berwarna, tidak berbau, berasa manis, dan tidak beracun, digunakan dalam proses ekstraksi. Ekstraksi glukomanan melibatkan maserasi dengan berbagai konsentrasi gliserol (45, 65, dan 85% v/v). Proses maserasi dilakukan dengan pengadukan pada 12.000 rpm selama 1 jam, diulang dua kali, dan diikuti dengan tiga kali pencucian dengan air suling. Untuk mengurangi kadar kalsium oksalat pada umbi porang, dilakukan perendaman dalam larutan NaCl 10% dan 20% (b/v) pada suhu 80°C selama 30 menit. Konsentrasi gliserol 85% (v/v) memberikan hasil yang optimal untuk ekstraksi glukomanan, menghasilkan glukomanan dengan kandungan 61,2%. Analisis proksimat menunjukkan glukomanan dengan kadar lemak 0,29%; protein 2,33%; karbohidrat 9,41%; air 9,40%; dan abu 2,08%. Konsentrasi NaCl yang paling efektif untuk menurunkan kadar kalsium oksalat adalah 20%, yang menghasilkan penurunan kadar kalsium oksalat sebesar 88,44%. Effect of Glycerol Concentration Variation on Glucomannan Extraction from Porang Tubers (Amorphophallus oncophyllus). Due to the high glucomannan content in its tubers, the porang plant (Amorphophallus oncophyllus) emerges as a potential glucomannan source in Indonesia. Glucomannan, known for its low sugar content, can serve as a healthy rice substitute. This study focuses on glucomannan extraction using glycerol, determining proximate levels, and assessing calcium oxalate levels in glucomannan. Glycerol, a colorless, odorless, sweet-tasting, and non-toxic liquid, was employed in the extraction process. Glucomannan extraction involved maceration with varying glycerol concentrations (45, 65, and 85% v/v). Maceration, accompanied by stirring at 12,000 rpm for 1 hour, was repeated twice, followed by three washes with distilled water. To reduce calcium oxalate levels in porang tubers, soaking using 10% and 20% (w/v) NaCl solution at 80°C for 30 minutes was carried out. An 85% (v/v) glycerol concentration yielded optimal results for glucomannan extraction, producing glucomannan with a content of 61.2%. Proximate analysis indicated glucomannan with 0.29% fat, 2.33% protein, 9.41% carbohydrates, 9.40% water, and 2.08% ash content. The most effective NaCl concentration for reducing calcium oxalate content was 20%, resulting in an 88.44% reduction in calcium oxalate levels
Skrining Bakteri Termohalofilik Penghasil L-asparaginase dari Sumber Air Panas Wawolesea Sulawesi Tenggara dan Uji Aktivitas Enzimnya Muzuni Muzuni; Jamaluddin Jamaluddin; Suriana Suriana; Ardiansyah Ardiansyah; Nur Arfa Yanti
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 1 (2024): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.1.73523.12-21

Abstract

L-asparaginase merupakan enzim yang mengubah L-asparagin menjadi L-aspartat. L-asparagin dapat dimanfaatkan oleh sel kanker leukemia sebagai salah satu sumber nutrisinya. Penambahan L-asparaginase dapat menghambat pertumbuhan sel kanker. Penggunaan L-asparaginase dalam skala industri lebih mengutamakan L-asparaginase yang memiliki aktivitas dan stabilitas optimum di suhu tinggi, karena kecepatan reaksi dalam menghidrolisis L-asparagin tinggi, stabil dari denaturan misalnya detergen dan senyawa organik, dan stabil pada kondisi asam maupun basa. L-asparaginase yang memiliki aktivitas dan stabilitas di suhu tinggi dapat dieksplorasi dari mikroorganisme yang hidup di lingkungan yang bersuhu dan bersalinitas tinggi. Tujuan penelitian ini adalah untuk memperoleh isolat bakteri termohalofilik penghasil enzim L-aparaginase dari sumber air panas Wawolesea dan untuk mengetahui aktivitas enzim L-asparaginase yang dihasilkannya. Bakteri termohalofilik penghasil enzim L-asparaginase diperoleh dengan tahapan: isolasi bakteri pada media NA yang mengandung NaCl 1,5% – 1,6%; seleksi bakteri penghasil L-asparaginase pada media M-9; produksi L-asparaginase dengan prinsip fermentasi pada media produksi serta pengukuran aktivitas dan aktivitas spesifik enzim L-asparaginase. Hasil isolasi menunjukkan adanya 14 isolat bakteri termohalofilik yang mampu menghasilkan enzim L-asparaginase. Aktivitas enzim L-asparaginase tertinggi yaitu 86,61 IU/mL pada isolat AAT3.2 dan terendah yaitu 38,24 IU/mL pada isolat CAT1.1. Aktivitas spesifik tertinggi 6767,98 IU/mg pada isolat CAT3.2 dan terendah 684,54 IU/mg pada isolat CAT1.1.Screening of L-asparaginase-Producing Thermohalophilic Bacteria from Wawolesea Hot Springs in Southeast Sulawesi and Their Enzyme Activity Test. The L-asparaginase is an enzyme that can convert L-asparagine to L-aspartate. L-asparagine can be utilized by leukemia cancer cells as a source of nutrition. The use of L-asparaginase on an industrial scale prioritizes L-asparaginase that exhibits optimal activity and stability at high temperatures due to the high reaction rate in hydrolyzing L-asparagine, stability against denaturants such as detergents and organic compounds, and stability under acidic or basic conditions. L-asparaginase with activity and stability at high temperatures can be explored from microorganisms that live in high-temperature and high-salinity environments. This study aimed to obtain isolates of thermohalophilic bacteria that produce L-asparaginase enzymes from Wawolesea hot springs and determine the activity of the L-asparaginase enzymes. Thermohalophilic bacteria producing L-asparaginase from Wawolesea hot springs were obtained by the following steps: isolation of bacteria on NA (Nutrient Agar) media containing 1.5% – 1.6% NaCl, selection of L-asparaginase-producing bacteria on M-9 media, production of L-asparaginase with the principle of fermentation on production media and measurement of activity and specific activity of L-asparaginase enzyme. The isolation results showed that there were 14 isolates of thermohalophilic bacteria capable of producing L-asparaginase. The highest L-asparaginase enzyme activity was 86.61 IU/mL in AAT3.2 isolates, and the lowest was 38.24 IU/mL in CAT1.1 isolates. The highest specific activity was 6767.98 IU/mg in isolate CAT3.2, and the lowest was 684.54 IU/mg in isolate CAT1.1.
Sintesis dan Karakterisasi Film Pengemas Aktif dari Kombinasi Kitosan-Alginat dan Asam Sitrat Sulistiyana Sulistiyana; Baiq Amelia Riyandari; Nini Nurkamariati
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 1 (2024): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.1.79153.120-129

Abstract

Salah satu permasalahan yang terjadi di bidang pangan adalah penurunan kualitas pangan karena proses oksidasi lipid. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan variasi konsentrasi asam sitrat terhadap karakteristik film Kompleks Polilektrolit (KPE) Kitosan Alginat. Penelitian ini menggunakan metode eksperimen dengan pendekatan kuantitatif. Film KPE pada penelitian ini diperoleh dari penambahan asam sitrat dengan variasi konsentrasi 0 ppm(A0), 5 ppm(A1), 10 ppm(A2) dan 20 ppm(A3) ke dalam larutan kitosan-alginat. Parameter uji karakteristik film meliputi uji ketebalan, kadar air, kelarutan, densitas, transparansi film, FTIR dan aktivitas antioksidan. Hasil uji statistik menunjukkan penambahan asam sitrat dengan variasi konsentrasi berpengaruh signifikan terhadap karakteristik film kitosan alginat. Penambahan asam sitrat mampu meningkatkan ketebalan, densitas, dan transparansi film, namun menurunkan kadar air dan kelarutan film. Film kitosan alginat dengan penambahan asam sitrat memiliki nilai ketebalan dengan kisaran 0,0123-0,0187 mm dan telah memenuhi standar ketebalan edible film menurut Japanese Industrial Standard (JIS). Kadar air film berada pada rentang 11,74-15,85% dan telah memenuhi standar kadar air film sesuai SNI 06-3735-1995. Nilai kelarutan film berada pada rentang 8,33-12,215%, nilai transparansi film berada pada rentang 0,5127-4,9910, sedangkan nilai densitas film berada pada rentang 0,2105-2,0350 g.mL-1. Nilai aktivitas antioksidan tertinggi dimiliki oleh film dengan konsentrasi asam sitrat tertinggi (film A3).Synthesis and Characterization of Active Packaging Film from a Combination of Chitosan Alginate and Citric Acid. One problem in the food sector is a decrease in food quality caused by the lipid oxidation process. This research aims to determine the effect of adding citric acid at different concentration levels to chitosan-alginate polyelectrolyte complex (PEC) films. This research used an experimental method with a quantitative approach. The concentrations of citric acid used in this research were 0 ppm(A0 film), 5 ppm(A1 film), 10 ppm(A2 film), and 20 ppm(A3 film). The physical properties tests of the films included thickness, water content, solubility, density, and transparency. The chemical properties test of the films included FTIR and antioxidant activity. Statistical test results showed that adding citric acid with varying concentrations significantly affected the characteristics of chitosan alginate films. Adding citric acid could increase film thickness, density, and transparency while decreasing film water content and solubility. The characteristics of chitosan alginate film with the addition of citric acid resulted in a film thickness of 0.0123 - 0.0187 mm. The range of the film density was 0.2105 - 2.0350 g.mL-1, while the range of water content was 11.74-15.85%. These values correspond to SNI 06-3735-1995. The value of film solubility was 8.33–12.215%. The transparency of films was 0.5127–4.9910. Antioxidant activity was tested using a DPPH solution, which showed that the highest concentration of citric acid in films had the greatest antioxidant activity.

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