cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
M. Widyo Wartono
Contact Email
widyo@mipa.uns.ac.id
Phone
-
Journal Mail Official
alchemymipauns@gmail.com
Editorial Address
-
Location
Kota surakarta,
Jawa tengah
INDONESIA
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 281 Documents
 19   20   21   22   23 
Simulasi Inhibisi Aktivitas Enzim α-Amilase dan α-Glukosidase oleh Senyawa Bioaktif Mikroalga Spirulina platensis Syafrizayanti Syafrizayanti; Adetya Putri; Marniati Salim; Arif Juliari Kusnanda
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.73120.223-233

Abstract

Diabetes Melitus (DM) Tipe 2 merupakan penyakit dengan gejala hiperglikemia dengan jumlah kasus yang meningkat setiap harinya pada populasi dunia. Enzim yang berperan terkait DM Tipe 2 yaitu α-amilase dan α-glukosidase yang bertindak dalam menghidrolisis pati pada pankreas. Target terapi dalam pengobatan DM Tipe 2 yaitu penurunan reabsorpsi glukosa di usus dengan melakukan penghambatan enzim α-amilase dan α-glukosidase. Tujuan penelitian ini adalah untuk mencari senyawa bioaktif yang terkandung dalam ekstrak Spirulina platensis yang berpotensi menjadi inhibitor α-amilase dan α-glukosidase sebagai antidiabetes secara in silico. Metode yang digunakan berupa skrining senyawa aktif dari literatur, farmakokinetika dengan prediksi ADMET, Lipinski’s Rule of Five dan simulasi penambatan molekul dengan program MOE. Berdasarkan hasil skrining dan simulasi penambatan molekul menunjukkan bahwa senyawa 4-amino-benzoat dapat berikatan dengan enzim α-amilase dengan afinitas pengikatan sebesar -4,16 kcal.mol-1 dengan situs pengikatan dengan asam amino His 299 dan Asp 195, dan berikatan dengan enzim α-glukosidase dengan afinitas pengikatan sebesar -4,08 kcal.mol-1 dengan situs pengikatan dengan asam amino Asn 58 dan Arg 17. Hasil ini menunjukkan senyawa 4-amino-benzoat dari mikroalga Spirulina platensis dapat dijadikan sebagai kandidat bahan alami dalam pengobatan antidiabetes.Inhibition Activity Simulation of α-Amylase and α-Glucosidase Enzyme by Bioactive Compounds of Microalgae Spirulina platensis. Diabetes Mellitus (DM) Type 2 is a disease with symptoms of hyperglycemia, in which its case number is increasing daily in the world population. Enzymes playing a role related to Type 2 DM, namely α-amylase and α-glucosidase, act in hydrolyzing starch in the pancreas. The therapeutic target in treating Type 2 DM is to decrease glucose reabsorption in the intestine by inhibiting the enzymes α-amylase and α-glucosidase. This study aimed to find bioactive compounds in Spirulina platensis extracts that can become α-amylase and α-glucosidase inhibitors as in silico antidiabetics. The method used was screening active compounds from the literature, pharmacokinetics with ADMET predictions, Lipinski’s Rule of Five, and molecular docking simulations with the MOE program. Based on the screening results and molecular docking simulations, it was shown that the 4-amino-benzoic compound could bind to the α-amylase enzyme with a binding affinity of -4.16 kcal.mol-1 with a binding site with the amino acids His 299 and Asp 195, and bind with the α-glucosidase enzyme with a binding affinity of -4.08 kcal.mol-1 with a binding site with the amino acids Asn 58 and Arg 17. These results show that the 4-amino-benzoic compound from Spirulina platensis microalgae can be a candidate for natural ingredients in antidiabetic treatment.
Deoksigenasi Katalitik Metil Ester Asam Lemak Menjadi Biohidrokarbon Menggunakan Katalis Cr2O3/Zeolit Isalmi Aziz; Nanda Saridewi; Fitri Febriyani; Lisa Adhani
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.72521.170-176

Abstract

Deoksigenasi katalitik merupakan proses yang dapat mengkonversi metil ester asam lemak (fatty acid methyl esters, FAME) menjadi biohidrokarbon seperti gasolin, kerosin dan diesel. Katalis yang digunakan berupa Cr2O3 dengan penyangga zeolit alam. Penelitian ini bertujuan untuk menentukan pengaruh konsentrasi Cr2O3 terhadap karakteristik dan aktivitas katalitik katalis pada deoksigenasi katalitik FAME menjadi biohidrokarbon. Katalis dikarakterisasi menggunakan XRD, FTIR DAN SAA. Semua katalis menunjukkan puncak Cr2O3 pada 2θ 24,5°; 33,6°; 36,2°;54,8° dan ukuran kristal 19 ‒ 21 nm. Serapan pada bilangan gelombang 470 ‒ 900 cm-1 mengindikasikan adanya peregangan Cr‒O. Peningkatan konsentrasi Cr2O3 menyebabkan luas permukaan menjadi turun. Katalis Cr2O3/zeolit 1% menunjukkan aktivitas terbesar dengan konversi 60,36% dan selektivitas biohidrokarbon 43,15% yang terdiri dari gasolin 7,23%, kerosin 15,08% dan diesel 20,84%.Catalytic Deoxygenation of Fatty Acid Methyl Esters into Biohydrocarbons using Cr2O3/Zeolite Catalysts. Catalytic deoxygenation is a process that can convert fatty acid methyl esters (FAME) into biohydrocarbons such as gasoline, kerosene, and diesel. The catalyst used is Cr2O3 with natural zeolite as support. This study aims to determine the effect of Cr2O3 concentration on the characteristics and catalytic activity in the catalytic deoxygenation of FAME into biohydrocarbons. The catalysts were characterized using XRD, FTIR, and SAA. All catalysts show a Cr2O3 peak at 2θ 24.5°, 33.6°, 36.2°, 54.8° and a crystal size of 19 ‒ 21 nm. The Cr‒O stretching is observable at wavenumbers 470 ‒ 900 cm-1. Increasing the concentration of Cr2O3 causes the surface area to decrease. Cr2O3/zeolite 1% catalyst showed the most excellent activity with 60.36% conversion and 43.15% selectivity for biohydrocarbons consisting of 7.23% gasoline, 15.08% kerosene, and 20.84% diesel.
Facile Synthesis of Composite Chitosan and Durio zibethinus Seed and Its Applications as Adsorbent of Metal Ion Ni(II) Putri, Silvia Devi Eka; Mulijani, Sri; Sutriah, Komar
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.65948.197-209

Abstract

Nickel is one of the most dangerous heavy metals that impact water ecosystems and human health. In the study, natural and harmless composite materials such as biochar and chitosan were modified to build adsorbent composites and form optimal conditions for the adsorption of nickel heavy metal ions from contaminated wastewater. Biochar was prepared from Durio zibethinus seeds by hydrothermal method to form nanopowder. It was treated with acid, while chitosan was designed as nanopowder by hydrothermal method, also without acid treatment. Composite adsorbents were prepared by mixing biochar and chitosan with a ratio of 4:3 (w/w). Fourier Transform Infrared characterizes composite materials as adsorbents, biochar, and chitosan. The surface morphology of the adsorbent was evaluated by scanning electron microscopy. Furthermore, Langmuir, Freundlich, and Temkin isotherms determine the adsorbent's performance. In addition, batch adsorption experiments were carried out to measure the effect of solution pH, adsorbent dosage, and initial concentration of metal ions. Nickel ion adsorption by the composite adsorbent showed an adsorption capacity of 26.69 mg/g, a maximum removal efficiency of 89.39% at optimum conditions of pH 6, an adsorbent dose of 0.5 g, and a contact time of 200 minutes. This adsorption capacity was better than chitosan and durian seed adsorbents. The nickel ion adsorption process by composite adsorbent shows a pattern in the Temkin isotherm model. In contrast, the chitosan and Durio zibethinus seed adsorbents tended to follow the Langmuir and Freundlich isotherm models. In addition, the adsorption kinetics of the composite material showed pseudo-second-order kinetics, and the reaction was exothermic.
Kinerja Karbon Aktif Daun Eceng Gondok pada Penurunan Kadar Fosfat Artifisial dan Surfaktan dalam Limbah Detergen Wulandari, Resa; Riyanto, Cucun Alep; Martono, Yohanes
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.65626.149-161

Abstract

Limbah detergen masuk ke dalam kategori limbah domestik karena limbah ini memiliki potensi membentuk film pada permukaan air dan menurunkan tingkat transfer oksigen ke dalam air. Oleh karena itu, penanganan limbah detergen diperlukan untuk meningkatkan kualitas air. Pada penelitian ini dilakukan sintesis karbon aktif dari Daun Eceng Gondok (DEG) sebagai adsorben fosfat dalam limbah fosfat artifisial dan surfaktan dalam limbah detergen. Tingginya kandungan selulosa dalam daun eceng gondok membuat tanaman tersebut memiliki potensi untuk diolah menjadi bahan dasar alternatif untuk karbon aktif. Sintesis karbon aktif DEG dilakukan melalui proses karbonisasi pada suhu 400 ℃ selama 60 menit dilanjutkan proses aktivasi dengan rasio karbon: H3PO4 30% yaitu 1:4 (b/b). Selanjutnya, pemanasan dilakukan menggunakan furnace pada suhu 600 ℃ selama 60 menit. Hasil penelitian menunjukkan bahwa karbon aktif DEG memiliki gugus fungsional O‒H, C‒H, C=C, C≡C, dan C‒O serta karakter mikropori (d = 1,10 nm) dan luas permukaan sebesar 726,49 m2/g. Pada kajian kinetika dan isoterm adsorpsi, penjerapan karbon aktif DEG terhadap fosfat dan surfaktan mengikuti pemodelan kinetika Elovich dengan kapasitas adsorpsi masing-masing adalah 11,67 mg/g dan 4,19 mg/g. Efektivitas karbon aktif DEG dalam adsorpsi fosfat dan surfaktan berturut-turut mencapai 78,35% dan 52,99%.Performance of Activated Carbon from Water Hyacinth Leaves (WHL) for Reducing Artificial Phosphate and Surfactant Levels in Detergent Waste. Detergent waste is classified into the domestic waste category because it forms a film on the water surface and reduce the oxygen level in the water. Therefore, handling detergent waste is necessary to improve water quality. In this research, activated carbon was synthesized from water hyacinth leaves (WHL) as an adsorbent for phosphate in artificial phosphate waste and surfactant in detergent waste. The high cellulose content in water hyacinth leaves gives this plant the potential to be processed into an alternative base material for activated carbon. The synthesis of activated carbon from WHL (ACWHL) was carried out through a carbonization process at 400 ℃ for 60 min followed by an activation process using a weight ratio of carbon: H3PO4 30% = 1:4 (w/w) followed by heating at 600 ℃ for 60 min. The research results show that ACWHL has the functional groups O‒H, C‒H, C=C, C≡C, and C‒O as well as microporous character (d = 1.10 nm) and a surface area of 726.49 m2/g. In the study of kinetics and adsorption isotherms, the adsorption of ACWHL on phosphate and surfactants followed Elovich kinetic modeling with adsorption capacities of 11.67 mg/g and 4.19 mg/g, respectively. The effectiveness of ACWHL in adsorption of phosphate and surfactant reached 78.35% and 52.99%, respectively.
Antibacterial Activity of Streptococcus mutans from Saga Herbaceous Plant (Abrus precatorius): In Silico Study Richa Mardianingrum; Neta Ekayanti Suganda; Srie Rezeki Nur Endah; Ruswanto Ruswanto
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.67780.177-189

Abstract

Antibacterial is a substance that can inhibit growth or can even kill bacteria that cause infection. One of them is infection with Streptococcus mutans bacteria that cause damage to teeth, such as dental caries. Dental caries is a disease that affects many adults and children, permanently damaging the tooth layer and forming small holes in the teeth. The purpose of this study was to find active compounds from the herb Saga plant (Abrus precatorius), which has the potential to be antibacterial of S. mutans in silico. The methods used are pharmacokinetics and toxicity screening, Lipinski's Rule of Five, as well as simulations of molecular docking and molecular dynamics. The Abruquinone D (-6.43) and Abruquinone F (-7.08) were predicted to have stable interactions and be similar to amoxicillin (-7.69) and native ligand (-8.56 kcal/mol) based on the results of screening and molecular docking simulations of active compounds from Saga herbaceous (Abrus precatorius) against deoxycytidylate deaminase receptors. Molecular dynamics findings confirmed by MMGBSA methods that Abruquinone D (-41.3876 kcal/mol) had a lower energy value than Abruquinone F (-24.8521 kcal/mol). It can be inferred that Abruquinone D has a higher potential as an antibiotic (S. mutans) than Abruquinone F.
Molecular Docking and Pharmacophore Analysis of Compounds from Ginger (Zingiber officinale) as Inhibitor for Dengue DEN2 NS2B/NS3 Serine Protease Neni Frimayanti; Enda Mora; Rindiyani Rindiyani
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.75234.190-196

Abstract

Dengue hemorrhagic fever (DHF) is a disease caused by the dengue virus (DENV). Dengue virus can enter the human body through the Aedes aegypti and Aedes albopictus mosquitoes. According to the Indonesian Ministry of Health, dengue hemorrhagic fever (DHF) is still a serious health problem in Indonesia. The type of dengue virus serotype most commonly found to cause infection in the human body is the DENV-2 serotype. This study aims to determine whether Ginger (Zingiber officinale) isolate compounds have potential as dengue DEN-2 NS2B/NS3 inhibitors. Samples used are compounds with IUPAC names (S)-5-hydroxy-1-(4-hydroxy-3-methoxyphenyl) octan-3-one (4-gingerol) and (S)-5-hydroxy-1-(3-methoxy-4-methylphenyl) decan-3-one. The method used is molecular docking and Pharmacophore using the MOE (Molecular Operating Environment) 2022.0901 software package. The results obtained based on the observed parameters of the two compounds isolated from ginger (Zingiber officinale) could be estimated as potential dengue DEN2 NS2B/NS3 inhibitors.
Efek Perbedaan Komposisi Komposit Na2FeSiO4/C Berbasis Silika Sekam Padi Terhadap Fasa dan Sifat Listriknya Agus Riyanto; Sutiarno Sutiarno; Nindya Aisah Indriyani; Wulan Warohmah; Silvi Indah Kusuma Wardani; Syafriadi Syafriadi; Pulung Karo Karo; Sri Wahyu Suciati
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 2 (2023): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.2.65707.140-148

Abstract

Salah satu teknik yang digunakan untukmengoptimasi sifat listrik dari Na2FeSiO4 ialah menambahkan grafit (C) sehingga menjadi komposit. Studi ini dilakukan untuk meninjau karakteristik fasa dan sifat listrik dari komposit Na2FeSiO4/C yang komposisinya bervariasi. Preparasi sampel diawali dari penyiapan Na2FeSiO4 dan dilanjutkan dengan pembuatan Na2FeSiO4/C. Na2FeSiO4 dipreparasi dari silika sekam padi, NaOH, Fe(NO3)3.H2O, dan C6H8O7.H2O menggunakan metode sol-gel diikuti dengan proses sinter pada suhu 800 ℃ selama 10 jam. Bahan baku Na2FeSiO4, grafit, dan Carboxy Methyl Cellulose (CMC) dengan variasi perbandingan massa dicampurkan dengan menambahkan n-metilpirrolidin hingga menjadi slurry, kemudian dikeringkan pada suhu 120 ℃ selama 1 jam dan menghasilkan komposit Na2FeSiO4/C. Spektrum FTIR mengindikasikan keberadaan gugus Na‒O, Fe‒O, Si‒O, dan C=C. Difraktogram mendeteksi keberadaan 4 fasa di dalam setiap sampel yaitu Na2FeSiO4, Na2SiO3, SiO2, dan grafit (C). Fasa Na2FeSiO4 memiliki puncak difraksi dengan intensitas tertinggi dibanding dengan fasa yang lainya sehingga terindikasi kuat bahwa fasa tersebut ialah fasa utama. Fasa grafit semakin meningkat seiring dengan meningkatnya komposisi grafit di dalam sampel sebagaimana terkonfirmasi dari naiknya intensitas puncak difraksi dari fasa tersebut, serta ditandai dengan menurunnya nilai transmitansi pada bilangan gelombang yang berkaitan dengan gugus C=C. Meningkatnya fasa grafit dalam Na2FeSiO4/C berpengaruh terhadap nilai penurunanenergi celah pita dan berpengaruh signifikan terhadap peningkatan konduktivitas listrik.
Kinetics and Thermodynamics Equilibrium of Nickel Metal Ions Sorption onto Carbon Nanofibers Irradiated by Ultrasonic Energy Alimin Alimin; La Ode Ahmad Nur Ramadhan; La Ode Ahmad; Fahmiati Fahmiati; Darwin Ismail; Ahmad Zaeni; Muhammad Zakir Muzakkar; Intan Intan; La Agusu; Indriana Kartini; Sri Juari Santosa
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.20.1.74223.22-30

Abstract

In this work, we investigated the effects of the heavy metal initial concentration and the pH on the sorption of heavy metal ions onto carbon nanofibers using the liquid phase adsorption technique under ultrasonic energy irradiation. These data were then used to study thermodynamic aspects such as sorption capacity and energy and kinetic parameters such as kinetic model, reaction order, and rate constant of heavy metal sorption on carbon nanofibers. We found that the increase of the heavy metal (nickel) initial concentration was proportional to the amount of heavy metal adsorbed onto carbon nanofibers. The highest uptake of the heavy metal ions' amount onto carbon nanofibers in equilibrium (qe) was 244.00 mg.g-1, achieved at the pH of 8. Langmuir and Freundlich's isotherms were used to find the best-fitted isotherms model. The Langmuir isotherm best fits the sorption equilibrium of the heavy metal ions on Carbon nanofibers. Bothipseudo-first and pseudo-second orders studied the sorption and kinetic parameters of heavy metals on carbon nanofibers. The sorption kinetics model was fitted to the pseudo second-order. Based on the value of Gibbs free energy, the metal ions' sorption onto carbon nanofibers occurs spontaneously.
Sintesis Kopoli(Anetol-Stearil Akrilat-Divinilbenzena) sebagai Material Alternatif Adsorben Handayani, Desi Suci; Pramono, Edi; Suwaji, Bagus Indra
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.20.1.77588.82-97

Abstract

Sintesis kopoli(Anetol-Stearil Akrilat-Divinilbenzena) atau KASA-DVB berhasil dilakukan melalui reaksi kopolimerisasi kationik menggunakan inisiator BF3O(C2H5)2 dan Stearil Akrilat (SA) dengan variasi 2, 4, dan 6 (b/b), pada jumlah anetol dan DVB tetap. Produk yang dihasilkan dikarakterisasi gugus fungsi, struktur, morfologi, viskositas intrinsik dan sifat termalnya berturut-turut menggunakan spektroskopi Fourier-transform infrared (FT-IR), proton nuclear magnetic resonance (1H-NMR), scanning electron microscopy dengan energy dispersive X-ray (SEM-EDX), viskometer Ostwald dan analisis thermogravimetric-differential thermal-differential scanning calorimetry (TG/DTA-DSC). Uji kinerja adsorpsi senyawa dilakukan dengan metode batch dan konsentrasi adsorbat ditentukan dengan Spektrofotometer UV-Vis. Data FT-IR menunjukkan hilangnya serapan gugus alil dan vinil sementara data 1H-NMR menunjukkan hilangnya H-alil dan H-vinil yang mengindikasikan KASA-DVB berhasil disintesis. Penambahan konsentrasi SA dapat meningkatkan nilai viskositas intrinsik. Analisis morfologi KASA-DVB diperoleh padatan dengan permukaan yang relatif kasar dan jumlah rongga semakin sedikit. Analisis termogram TG/DTA-DSC menunjukkan penurunan sifat termal yaitu diperoleh titik inisiasi degradasi massa yang lebih rendah. Nilai kapasitas adsorpsi tertinggi diperoleh dari hasil uji kinerja adsorpsi pada waktu kontak ke-60 menit dan variasi berat SA 2%. Berdasarkan data kinerja adsorpsi, menunjukkan bahwa KASA-DVB memiliki potensi sebagai adsorben. Uji adsorpsi menunjukkan kapasitas adsorpsi terbesar adalah 23,22 (mg/g) pada KASA-DVB 2%. Synthesis of Copoly(Anethol-Styryl Acrylate-Divinylbenzene) as an Alternative Adsorbent Material. Synthesis of copoly(Anethole-Stearyl Acrylate-Divinylbenzene) or KASA-DVB was successfully carried out by a cationic copolymerization reaction using BF3O(C2H5)2 initiator and various concentrations of Stearyl Acrylate (SA) are 2, 4, and 6 wt. The resulting products were characterized by functional groups, structure, morphology, intrinsic viscosity, and thermal properties using Fourier-transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (1H-NMR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), Ostwald Viscometer, and thermogravimetric-differential thermal-differential scanning calorimetry analysis (TG/DTA-DSC), respectively. The adsorption performance was analyzed using the batch method, and the adsorbate concentration was determined using a UV-Vis spectrophotometer. The FT-IR data showed loss of allyl and vinyl groups absorption, while 1H-NMR data showed loss of H-allyl and H-vinyl, indicating that KASA-DVB was successfully synthesized. The increase in SA concentration can increase the intrinsic viscosity value. Morphological analysis of KASA-DVB obtained solid materials with a relatively rough surface and fewer cavities. Thermogram analysis of TG/DTA-DSC showed a decrease in thermal properties, which was a lower mass degradation initiation point. The highest adsorption capacity was obtained from the adsorption performance with a contact time of 60 minutes and 2% SA weight variation. The adsorption performance data shows that KASA-DVB is potent as an adsorbent. The adsorption showed that the largest adsorption capacity was 23.22 (mg/g) on KASA-DVB 2%.
Enhancement of Liberica Coffee Quality by Wet Fermentation using Bacillus subtilis Indra Lasmana Tarigan; Ericha Aulia; Heriyanti Heriyanti; Madyawati Latief; Sutrisno Sutrisno
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 2 (2024): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.2.74248.162-177

Abstract

Coffee is a tree species in the Rubiaceae family and Coffea genus. One way to enhance the value of coffee commodities is by using fermentation technology. Fermentation can use probiotic bacteria found in mongoose digestive tracts, creating coffee with a unique taste and aroma. Bacillus subtilis is one of these bacteria, offering an alternative to those from mongoose. This study aimed to analyze the effects of fermentation using B. subtilis bacteria on the physicochemical and sensory properties of Liberica coffee. The study method included bacteria preparation, coffee fermentation, and testing. The samples' total phenolics, flavonoids, caffeine, and chlorogenic acid contents were estimated. The analysis was performed using UV-Vis and GC-MS spectrophotometers. The results revealed that the fermentation process using B. subtilis improved the sensory and physical qualities of the fermented Liberica coffee. The total values of phenolic and flavonoid contents and antioxidants of the fermented Liberica coffee were higher than that of the original coffee. GC-MS analysis exhibited compounds in the fermented coffee in which the highest was N-Dodecyl-N-(trifluoroacetyl)dodecanamide (C26H48F3NO2), with a retention time of 23.73 minutes and an area percentage of 18.96%. Moreover, the caffeine and chlorogenic acid of the fermented Liberica coffee was lower than that of the original coffee.

Page 21 of 29 | Total Record : 281

 19   20   21   22   23 

Filter by Year

2014 2026


Reset
Filter By Issues
All Issue Vol 22, No 1 (2026): March Vol 21, No 2 (2025): September Vol 21, No 1 (2025): March Vol 20, No 2 (2024): September Vol 20, No 1 (2024): March Vol 19, No 2 (2023): September Vol 19, No 1 (2023): March Vol 18, No 2 (2022): September Vol 18, No 1 (2022): March Vol 17, No 2 (2021): September Vol 17, No 1 (2021): March Vol 16, No 2 (2020): September Vol 16, No 1 (2020): March Vol 15, No 2 (2019): September Vol 15, No 1 (2019): March Vol 14, No 2 (2018): September Vol 14, No 1 (2018): March Vol 13, No 2 (2017): September Vol 13, No 1 (2017): March Vol 12, No 2 (2016): September Vol 12, No 1 (2016): March Vol 11, No 2 (2015): September Vol 11, No 1 (2015): March Vol 10, No 2 (2014): September Vol 10, No 1 (2014): March More Issue