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All Journal Jurnal Teknik Kimia USU KOVALEN: Jurnal Riset Kimia E-Dimas: Jurnal Pengabdian kepada Masyarakat CHEESA: Chemical Engineering Research Articles Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia FLUIDA Fullerene Journal of Chemistry Borneo Engineering: Jurnal Teknik Sipil International Journal of Applied Technology Research Equilibrium Journal of Chemical Engineering REACTOR : Journal of Research On Chemistry And Engineering Jurnal Teknik Kimia USU Industrial Research Workshop and National Seminar Journal of Innovative and Creativity Journal Serambi Engineering (JSE)
Keryanti, Keryanti
Jurusan Teknik Kimia, Politeknik Negeri Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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The Effect of Papaya Leaf Concentration and Fermentation Time on The Decafeination Process of Robusta Coffee Hariyadi, Tri; Keryanti, Keryanti; Salsabila, Nurisa; Sarah, Sarah
Fluida Vol. 16 No. 2 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i2.5441

Abstract

High level of caffeine in Robusta coffee requires the reduction of level to accommodate person with low caffeine tolerance. The wet fermentation process with papaya leaf extract containing the papain enzyme was used to decaffeinate the coffee. This study aimed to investigate the effects of papaya leaf extract concentration and sampling time on the decaffeination of Robusta coffee green beans. The papaya leaf extract concentration ranged from 10% to 80% (w/v), with fermentation lasting 6 to 72 hours. The caffeine content was measured using a UV-Vis spectrophotometer, and organoleptic tests were performed on 40 untrained panelists. The results showed that both the concentration of papaya leaf extract and the fermentation time influenced the decaffeination. The optimum result was obtained after 48 hours of fermentation with 80% (w/v) papaya leaf extract resulting in a caffeine content of 0.268% (w/w) from an initial content of 1.20% (w/w), representing a 77.82% decrease in caffeine level efficiency. Fermented coffee was preferred by 58% of panellists over unfermented coffee. These findings imply that papain found in papaya leaves can reduce caffeine levels while also improving flavor and aroma.
Sintesis Zn-BDC dengan Metode Sonokimia dan Aplikasinya Pada Proses Adsorpsi Ion Logam Pb2+ Abdilah, Fauzi; Hulupi, Mentik; Keryanti, Keryanti; Nabilah, Nida; Nabilah, Tiana Hasana
REACTOR: Journal of Research on Chemistry and Engineering Vol. 3 No. 1 (2022)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/

Abstract

The heavy metal ion pollution such as lead (Pb2+) in wastewater is an environmental problem that needs to be solved. The adsorption method has been reported to have good potential as an alternative method for reducing heavy metal contents in aquatic environment. The most widely used adsorbent media are porous materials with a large surface area and low density. Metal Organic Frameworks (MOFs) are a type of porous material that is widely applied in various fields, such as fuel purification, solvent recovery, gas storage, and adsorbents. Lead (II) is a heavy metal ion that can pollute the environment and endanger humans. This study aims to synthesize MOFs and apply it to the Pb2+ adsorption process. In this research, MOFs type Zn-BDC or MOF-5 were synthesized by sonochemistry method at 60 ℃ as adsorbent for Pb2+ ion. Characterization of the adsorbent by FTIR showed the presence of functional groups C=O, C-H, and Zn-O which indicated the formation of the MOF-5 compound. The concentrations of Pb2+ ions were analyzed using Atomic Absorption Spectrophotometer (AAS). The experimental results show the optimum conditions for the adsorption process at pH 5 for 60 minutes with adsorption efficiency reaching 93.41%. Testing the adsorption isotherm model showed that the Pb2+ ion adsorption process using Zn-BDC as an adsorbent followed the Langmuir isotherm model with the R2 value of 0.9986.
Pengaruh Konsentrasi Hidrolisat Kulit Pisang Raja Terhadap Produksi Biohidrogen Menggunakan Escherichia Coli Melalui Dark Fermentation Atqiyaa, Millatul; Fitriani, Ana; Keryanti; Ramadhani, Laily Isna
Prosiding Industrial Research Workshop and National Seminar Vol. 16 No. 1 (2025): Vol. 16 No. 1 (2025): Prosiding 16th Industrial Research Workshop and National
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v16i1.6680

Abstract

Biohidrogen merupakan sumber energi terbarukan yang dihasilkan melalui proses biologis dan berpotensi menjadi alternatif pengganti bahan bakar fosil. Penelitian ini bertujuan untuk memproduksi biohidrogen melalui proses dark fermentation dengan menggunakan hidrolisat kulit pisang raja sebagai substrat dan bakteri Escherichia coli sebagai inokulum. Kulit pisang raja dihidrolisis secara enzimatis menggunakan enzim α-amilase dan glukoamilase, menghasilkan gula pereduksi dalam hidrolisat sebesar 7,60% (b/v). Variasi konsentrasi hidrolisat terhadap volume media fermentasi yang digunakan dalam proses fermentasi adalah 20%, 30%, 40%, dan 50% (v/v) pada suhu 37 °C selama 7 hari. Hasil penelitian menunjukkan bahwa pertumbuhan mikroorganisme E. coli meningkat seiring dengan peningkatan konsentrasi hidrolisat, dengan berat sel kering tertinggi pada konsentrasi 50% yaitu sebesar 2,59 g/L. Volume gas tertinggi dihasilkan pada konsentrasi hidrolisat 30%, yaitu sebesar 12,56 mL. Namun, analisis menggunakan GC-TCD menunjukkan bahwa gas biohidrogen tidak terdeteksi pada hasil fermentasi semua variasi konsentrasi. Hal ini mengindikasikan perlunya optimasi lebih lanjut terhadap kondisi fermentasi, termasuk pengendalian pH dan pemilihan mikroorganisme yang lebih sesuai, untuk meningkatkan produksi biohidrogen.
Strategi Pengelolaan Bisnis Budidaya Maggot Black Soldier Fly (BSF) dalam Akselerasi Program Kampus Zero Waste: Studi Kasus Politeknik Negeri Bandung Dewi Amalia; Aceng Gima Sugiama; Yackob Astor; Harita Nurwahyu Chamidy; Keryanti; Ira Puspitasari
Journal of Innovative and Creativity Vol. 6 No. 1 (2026)
Publisher : Fakultas Ilmu Pendidikan Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joecy.v6i1.7478

Abstract

Institusi pendidikan tinggi menghadapi tantangan signifikan dalam mengelola limbah organik. Studi ini mengevaluasi proyek percontohan budidaya larva lalat Black Soldier Fly (BSF) sebagai solusi ekonomi sirkular di Politeknik Negeri Bandung (POLBAN). Menggunakan pendekatan metode campuran konvergen paralel, penelitian ini menggabungkan data operasional kuantitatif dengan analisis pemangku kepentingan kualitatif. Hasil menunjukkan bahwa sistem mencapai indeks pengurangan limbah sebesar 90,07%, dengan pemrosesan limbah organik hingga 1,57 ton per bulan secara konsisten. Efisiensi produksi meningkat secara signifikan, dengan Rasio Konversi Pakan (FCR) turun dari 19,9:1 menjadi 2,7:1 dalam tiga bulan. Secara finansial, proyek ini mencapai kemandirian dalam pembibitan, dan menghilangkan biaya benih. Penelitian ini menyediakan peta jalan strategis untuk mengintegrasikan teknologi biokonversi ke dalam kebijakan pengelolaan limbah institusional.
Co-Authors Abdilah, Fauzi Aceng Gima Sugiama Ade Safaat Ahmad Faizal Ahmad, Zidni Zakiyyah Alifa Dewi Kirana Amalia, Dhea Nurul Amalia, Putri Vina Ambar Susanto, Ambar Anggraeni, Nani Ari Marlina Asih, Ria Puspa Atqiyaa, Millatul Azzahra, Rheisya Talitha Chamidy, Harita Nurwahyu Citra Noer Aqsha Citra Noer Aqsha Connery Manurung, Prans Deni Ramdhani Deni Ramdhani Dewi Amalia Dewi Amalia Dini Nurcahya Dini Nurcahya Djatnika, Tjetjep Endang Kusumawati Fauzi Abdilah Fitriani, Ana Fitrianti, Yanis Ghinaa Annisa Khairani Gianistri Maulani Hariyadi, Tri Hasanah, Rizkiya Herawati Budastuti Herliana, Hanafiah Hidayah, Resti Nurul Indrita Putri, Anindya Ira Puspitasari Karina Aulia Rahmawati Karina Aulia Rahmawati Manfaati, Rintis Marhani, Della Agustia Mauludin, Luthfi Muhammad Mentik Hulupi Min, Joe Lian Muhamad Nur Rojab Muhammad Hafizh Nabilah, Nida Nabilah, Tiana Hasana Nida Nabilah Permanasari, Ayu Ratna PUDIN, APIP Ramadhani, Laily Isna Ratna Yulistya Ningrum Ratna Yulistya Ningrum Retno Indarti Riski Harliyansyah Riski Harliyansyah Rizki, Anwar Muhamad Salsabila, Nurisa Sarah Sarah, Sarah Sihombing, Rony Pasonang Sri Harjati Suhardi Tiana Hasna Nabilah Tri Hariyadi Trirahayu, Dhyna Analyes Widya Tresna Dewi Widya Tresna Dewi Yackob Astor Yulistiani, Fitria Zahra Nur Salsabila