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Optimization of Bioethanol Synthesis from Durian Seeds Using Saccharomyces Cerevisiae in Fermentation Process Masturi, Masturi; Alighiri, Dante; Dwijananti, Pratiwi; Widodo, Rahmat Doni; Budiyanto, Saraswati Putri; Drastisianti, Apriliana
Jurnal Bahan Alam Terbarukan Vol 9, No 1 (2020): June 2020 [Nationally Accredited - Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v9i1.23574

Bioethanol is an alternative energy of environmentally friendly as a substitute for petroleum. Sucrose, starch, and fibrous cellulose (lignocellulose) are the main ingredients for bioethanol production. The material is very easy and abundant to get from the waste of agricultural crops. One of these agricultural wastes in Indonesia that have not been used optimally is durian seeds. Durian seeds only become waste and are not commercially useful, even though they contain high carbohydrates, which is possible as a potential new source for bioethanol production. In this work, an experimental study was conducted on bioethanol synthesis from durian seeds through fermentation by Saccharomyces cerevisiae yeast in aerobic fermenter. The process for the production of starch-based bioethanol includes milling, hydrolysis, detoxification, fermentation, and distillation. At the stage of fermentation, variations in the duration of fermentation were applied for 1-11 days. Carbohydrates contained in durian seed flour are 11.541%, which is the largest content. The highest result of ethanol content is 14.72 % (v/v) in 9 day fermentation periods by using Saccharomyces cerevisiae in aerobic conditions. Distillation to enrich bioethanol was carried out by batch vacuum distillation at 68Ã‚Â°C for Ã‚Â± 180 minutes and produced bioethanol with a purity of 95%.

Implementation of Collaborative Learning Based on Sharing task Activi-ties on the Topic of Factors Afecting Reaction Rate Sari, Wiwik Kartika; Drastisianti, Apriliana; Nada, Ella Izzatin
PAEDAGOGIA Vol 23, No 2 (2020): PAEDAGOGIA Jilid 23 Nomor 2 (2020)
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/paedagogia.v23i2.52237

Learning of 21st century emphasizes the ability of students to find out from various sources, formulate problems, think analytically, and collaborate in solving problems. Collaboration will occur when classroom interactions between teacher and students can critically integrate topics, express, listen to multiple voices and points of view, and create effective learning relationships. The aims of this study was to analyze collaborative learning that occurs between students based on the sharing task activities that have been designed. This research was conducted on XI grade high school students. The data was taken from the topic of factors affecting reaction rate. The research method used is descriptive qualitative. The instruments used were didactic designs and student worksheets that have been declared valid by experts. The learning process is observed and recorded. Based on the results of observations and videos, student activities were analyzed which parts showed collaboration between students during the learning process using sharing tasks. Collaboration that occurs between students shows a quality learning process.

Analysis of The Use of Analogy of Chemical Education Students on The Concept of Chemical Bond Naqsyahbandi, Fajar; Mulyatun, Mulyatun; Drastisianti, Apriliana; Muhariyansah, Jajang
J-PEK (Jurnal Pembelajaran Kimia) Vol 7, No 2 (2022): J-PEK (JURNAL PEMBELAJARAN KIMIA)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um026v7i22022p058

The analogy is a valuable pedagogical tool for educators because, by using an analogy, abstract concepts in chemistry can be explained effectively. Therefore, prospective educators need to understand analogies. This qualitative descriptive study aims to analyze and describe the analogy used by chemistry education students on the concept of chemical bonds. The test instrument used the form of 10 open-ended questions been validated by anexpert. The results showed three types of analogies: simple analogies, enriched analogies, and extended analogies. This analogy is still single, with the lowest average percentage in the extended analogy type of 5%, while the enriched analogy type is at a percentage of 24%. The analogy type mostly used by students is a simple analogy type with an average percentage of 31 % , and as much as 40% of students do not analogize the existing concept of chemical bonds.

Pembelajaran Berbasis Riset untuk Meningkatkan Kemampuan Multipel Representasi Mahasiswa dalam Memahami Soal HOTS Drastisianti, Apriliana; Alighiri, Dante
Jurnal Komunikasi Pendidikan Vol 5 No 2 (2021): Jurnal Komunikasi Pendidikan
Publisher : Universitas Veteran Bangun Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32585/jkp.v5i2.1041

Mahasiswa pendidikan kimia sebagai calon guru kimia harus menguasai kompetensi guru salah satunya kompetensi pedagogik. Upaya untuk membekali mahasiswa pendidikan kimia agar memiliki kompetensi tersebut salah satunya dengan membuat soal HOTS (Higher Order Thinking Skills) dalam proses pembelajaran. Penelitian ini merupakan penelitian pengembangan dan bertujuan untuk mengetahui kemampuan mahasiswa pendidikan kimia dalam membuat soal HOTS berbasis multipel representasi. Penelitian dilakukan dengan menggunakan prosedur pengembangan Borg & Gall yang berupa 10 tahap, tetapi dibatasi hanya sampai tahap 7. Pengambilan data dilakukan dengan lembar angket, uji coba soal, dan wawancara. Soal-soal yang dibuat oleh mahasiswa dikategorikan berdasarkan ranah kognitif taksonomi Bloom dan diperoleh 40 soal dengan rincian soal ranah C1 30%, C2 17,50%, C3 15%, C4 22,50%, C5 10%, dan C6 5%. Soal dengan kategori HOTS sebanyak 15 soal (37,50%). Soal HOTS tersebut dianalisis lebih lanjut dan diperoleh reliabilitas sebesar 0,78 (tinggi) dan 11 soal memenuhi kriteria sehingga dapat digunakan. Kemampuan multipel representasi mahasiswa dalam menyusun soal HOTS mengalami peningkatan.

Antibacterial Activity from Fraction of Liquid-Liquid Extraction in Temulawak Rhizome (Curcuma xanthorrhiza Roxb.) Alighiri, Dante; Firnanda, Indah Putri; Abdullah, Ravely Adhitya; Widodo, Naufaldi Bani; Drastisianti, Apriliana
Walisongo Journal of Chemistry Vol. 7 No. 2 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i2.23333

The rhizome of Temulawak (Curcuma xanthorrhiza Roxb) has been traditionally used to treat various ailments due to its rich content of curcumin, demethoxycurcumin, and bisdemethoxycurcumin. These compounds exhibit notable antioxidant and antibacterial properties. This study aimed to evaluate the antibacterial efficacy of Temulawak rhizome extracts in n-hexane, ethyl acetate, and methanol, focusing on Escherichia coli and Staphylococcus aureus. The extraction process involved successive maceration with each solvent. The antibacterial activity was tested using well diffusion and microdilution methods, determining minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). Phytochemical screening revealed the presence of flavonoids, alkaloids, phenolics, steroids, and triterpenoids in the extracts. The results indicated that the n-hexane and ethyl acetate fractions exhibited intense antibacterial activity against Staphylococcus aureus, while all fractions showed potent activity against Escherichia coli. The MIC values ranged from 39.0625 to 625 ppm for Staphylococcus aureus and 39.0625 to 78.125 ppm for Escherichia coli, with MBC values generally higher than MIC values. These findings highlight the potential of Temulawak rhizome extracts as effective antibacterial agents.

Antibacterial Activity from Fraction of Liquid-Liquid Extraction in Temulawak Rhizome (Curcuma xanthorrhiza Roxb.) Alighiri, Dante; Firnanda, Indah Putri; Abdullah, Ravely Adhitya; Widodo, Naufaldi Bani; Drastisianti, Apriliana
Walisongo Journal of Chemistry Vol. 7 No. 2 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i2.23333

The rhizome of Temulawak (Curcuma xanthorrhiza Roxb) has been traditionally used to treat various ailments due to its rich content of curcumin, demethoxycurcumin, and bisdemethoxycurcumin. These compounds exhibit notable antioxidant and antibacterial properties. This study aimed to evaluate the antibacterial efficacy of Temulawak rhizome extracts in n-hexane, ethyl acetate, and methanol, focusing on Escherichia coli and Staphylococcus aureus. The extraction process involved successive maceration with each solvent. The antibacterial activity was tested using well diffusion and microdilution methods, determining minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). Phytochemical screening revealed the presence of flavonoids, alkaloids, phenolics, steroids, and triterpenoids in the extracts. The results indicated that the n-hexane and ethyl acetate fractions exhibited intense antibacterial activity against Staphylococcus aureus, while all fractions showed potent activity against Escherichia coli. The MIC values ranged from 39.0625 to 625 ppm for Staphylococcus aureus and 39.0625 to 78.125 ppm for Escherichia coli, with MBC values generally higher than MIC values. These findings highlight the potential of Temulawak rhizome extracts as effective antibacterial agents.

Risk analysis of air quality for parameters NO2, SO2, NH3, and Ox from the area around fertilizer industries in Indonesia Alighiri, Dante; Widodo, Naufaldi Bani; Abdullah, Ravely Adhitya; Firnanda, Indah Putri; Drastisianti, Apriliana
Journal of Natural Sciences and Mathematics Research Vol. 11 No. 1 (2025): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.v11i1.23331

Industrial zones with intensive human activities often experience air-quality degradation, particularly in areas surrounding fertilizer production facilities. This study analyzes the concentrations of nitrogen dioxide (NO₂), sulfur dioxide (SO₂), ammonia (NH₃), and oxidants (Ox) in the ambient air around fertilizer industries in Indonesia and evaluates their potential non-carcinogenic health risks. Air sampling was conducted using an InScienPro US-1012 impinger equipped with selective absorbent solutions. Pollutant concentrations were quantified using UV-Vis spectrophotometry based on the Griess–Saltzman method for NO₂, the pararosaniline method for SO₂, the indophenol method for NH₃, and the neutral buffer potassium iodide method for Ox. Concentrations were compared with national ambient air-quality standards. To strengthen the assessment, a quantitative health-risk evaluation was incorporated using the Hazard Quotient (HQ) and Hazard Index (HI), allowing for the interpretation of long-term exposure impacts. Results show that most pollutant concentrations were below regulatory limits; however, SO₂ levels at one sampling point and NH₃ levels near the production zone were elevated. The HQ–HI analysis revealed that SO₂ at the office-area sampling point (HQ = 0.794) and NH₃ inside the processing plant (HQ = 2.238) were the dominant contributors to cumulative exposure, with HI values exceeding 1 at both locations. These findings indicate potential non-carcinogenic risks for individuals chronically exposed in areas closest to emission sources. Overall, this study highlights the importance of continuous monitoring and risk-based evaluation to identify localised hotspots, inform mitigation strategies, and enhance emission control practices in fertiliser-industrial environments.

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