Article Per Year (5 Year)
p-Index From 2021 - 2026
3.254
P-Index
This Author published in this journals
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 Serambi Engineering
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 Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

Published : 23 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 23 Documents
Search

 1   2   3 
Pengaruh Konsentrasi Tepung Kulit Nanas Pada Fermentasi Dengan Metode SHF dan SSF Untuk Menghasilkan Etanol Keryanti, Keryanti; Herliana, Hanafiah; Anggraeni, Nani; Manfaati, Rintis
Prosiding Industrial Research Workshop and National Seminar Vol. 14 No. 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Semina
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v14i1.5443

Abstract

Limbah kulit nanas masih memiliki kandungan pati 17.53% (b/b), protein kasar 8.78% (b/b), lemak kasar 1.15% (b/b) dan gula reduksi 13.65% (b/b) sehingga dapat menjadi alternatif bahan baku fermentasi untuk menghasilkan etanol. Produksi etanol dari bahan pati dan selulosa seperti tepung kulit nanas beberapa kali telah dilakukan, namun etanol yang dihasilkan kurang optimal sehingga membutuhkan alternatif proses yang dapat meningkatkan kualitas etanol. Upaya peningkatan produksi etanol dari tepung kulit nanas dapat dilakukan dengan menggunakan dua metode yaitu Separated Hydrolysis and Fermentation (SHF) dan Simultaneous Saccharification and Fermentation (SSF). Tujuan penelitian ini untuk mengetahui pengaruh variasi konsentrasi tepung kulit nanas terhadap kadar etanol hasil fermentasi dengan metode SHF dan SSF. Variasi konsentrasi tepung kulit nanas yang digunakan (g/L) yaitu 20, 40, 60 dan 80. Proses fermentasi dilakukan pada reaktor 250 mL selama 96 jam dengan penambahan inokulum Saccharomyces cerevisiae sebanyak 20% (v/v). Pada penelitian ini digunakan enzim selulase sebesar 5% (v/v) dari bahan baku yang telah dilarutkan untuk proses hidrolisis pada metode SSF serta katalis HCl 0.1 N (b/v) pada metode SHF. Pengujian dari hasil penelitian ini analisis kadar glukosa dengan metode DNS dan analisis kadar etanol menggunakan refraktometer serta HPLC. Dari hasil penelitian ini diperoleh kadar etanol tertinggi pada konsentrasi tepung kulit nanas 80 g/L sebesar 7.99% untuk metode SHF dan 13.01% untuk metode SSF.
Pengaruh Penambahan Polyvinyl Alcohol (PVOH) pada Biofoam dari Tepung Biji Nangka dan Ampok Jagung dengan Metode Thermopressing Fitrianti, Yanis; Azzahra, Rheisya Talitha; Kusumawati, Endang; Keryanti
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.9228

Abstract

Starch and fiber-based biofoam as a solution to replace the role of styrofoam. However, the biofoam still unqualified as a good foam characteristic. Polyvinyl alcohol (PVOH) is added to improve the physical characteristics of biofoam. This study aims to determine the effect of PVOH addition on the quality of starch-based biofoam from jackfruit seeds and corn hominy. The gelatinization process was carried out using a mixer in 350 rpm speed at 100 °C for 5 minutes, then moulded in a thermopressing unit for 25 minutes at 100 °C. The characteristics of the material with amylose and amylopectin contents 17.30% and 31.60% respectively and corn hominy's fiber content at 2.72%. The best PVOH addition was 10% addition based on its characteristics from parameters such as water absorption, density, and biodegradability were close to Synbra Technology’s standard. However, all the physical and mechanical characteristics of the produced biofoam still can't reach the standard.
The Effect of Cabbage Waste Concentration and Fermentation Time on The Decaffeination of Arabica Coffee Hariyadi, Tri; Keryanti, Keryanti; Asih, Ria Puspa; Ahmad, Zidni Zakiyyah
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 2 (2024): June 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i2.129

Abstract

The purpose of this study was to determine the effect of the concentration of cabbage waste and fermentation time on the caffeine content reduction of Arabica coffee from Pangalengan. Decaffeination is carried out using a wet fermentation method using protease enzyme activity produced by lactic acid bacteria from cabbage waste. Protease enzymes can break down the slime layer on coffee beans so that caffeine is decomposed through the esterification process to become chlorogenic acid. Fermentation was carried out anaerobically in a fermenter with a capacity of ± 2L with a fermentation time of 72 hours and sampling every 6 hours. The concentration of cabbage waste ranged from 10-80% (w/w). Arabica coffee beans were tested for caffeine content (%) using a UV-Vis spectrophotometer. According to the study's findings, the caffeine level decreases as the concentration of cabbage waste increases. Meanwhile, the caffeine level decreases as fermentation time increases. The addition of 80% concentration of cabbage waste with 48 hours of fermentation time produced the optimum results for the Arabica coffee decaffeination process. This method achieved a decaffeination efficiency of more of 96% and met the quality standards outlined in SNI 01-3542-2004.
Pengaruh Penambahan Polyvinyl Alcohol (PVOH) pada Biofoam dari Tepung Biji Nangka dan Ampok Jagung dengan Metode Thermopressing Fitrianti, Yanis; Azzahra, Rheisya Talitha; Kusumawati, Endang; Keryanti
Jurnal Teknik Kimia USU Vol. 12 No. 2 (2023): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v12i2.9228

Abstract

Starch and fiber-based biofoam as a solution to replace the role of styrofoam. However, the biofoam still unqualified as a good foam characteristic. Polyvinyl alcohol (PVOH) is added to improve the physical characteristics of biofoam. This study aims to determine the effect of PVOH addition on the quality of starch-based biofoam from jackfruit seeds and corn hominy. The gelatinization process was carried out using a mixer in 350 rpm speed at 100 °C for 5 minutes, then moulded in a thermopressing unit for 25 minutes at 100 °C. The characteristics of the material with amylose and amylopectin contents 17.30% and 31.60% respectively and corn hominy's fiber content at 2.72%. The best PVOH addition was 10% addition based on its characteristics from parameters such as water absorption, density, and biodegradability were close to Synbra Technology’s standard. However, all the physical and mechanical characteristics of the produced biofoam still can't reach the standard.
Validasi Metode Analisis Iodin Secara Spektrofotometri UV-Vis pada Dua Variasi Pelarut: Validation of The Method of Iodin Analysis by Uv-Vis Spectrofotometry with Two Variations of Solution Abdilah, Fauzi; Karina Aulia Rahmawati; Widya Tresna Dewi; Keryanti; Hulupi, Mentik
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 3 (2023): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i3.16448

Abstract

In this study, the method of analysis of iodine by UV-Vis spectrophotometry was validated. Two other solvents, ethanol, and cyclohexane were used to validate this approach. The UV-Vis Spectrophotometer method's linearity, detection, and quantization limitations, precision, and accuracy were investigated as variables. The results of the linearity tests indicated that the method was proportionally verified because the r values for the two iodine solutions in ethanol and cyclohexane varied between 0.990 and 0.999, respectively. This suggests that the values were higher than 0.99. The LOD values for the ethanol solvent were 4.441 mg/kg and the LOQ was 14.802 mg/kg, whereas the cyclohexane solvent had an LOD value of 2.660 mg/kg and the LOQ was 8.866 mg/kg. According to the required precision acceptance, the %RSD value of 2%, precision values for both standard iodine solutions with two modifications of solvents demonstrated good results. Recovery percentages of ethanol solvents are 96% and cyclohexane solvents are 86%, respectively, according to accuracy measurements. The combined uncertainty value for this test is 0.109 for the ethanol solvent and 0.019 for the cyclohexane solvent, respectively. This research provides a comprehensive understanding of the validity of the iodine analysis method, establishing a robust foundation for the sustainability and reliability of using UV-Vis spectrophotometer in the analysis
Penentuan pH dan Suhu Optimum Isomerisasi Pembuatan Sirup Fruktosa dari Hidrolisat Onggok Menggunakan Katalis Mg/Al Keryanti, Keryanti; Permanasari, Ayu Ratna; Hidayah, Resti Nurul; Hasanah, Rizkiya
CHEESA: Chemical Engineering Research Articles Vol. 5 No. 1 (2022)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v5i1.10243.1-12

Abstract

Onggok merupakan limbah padat yang dihasilkan dari industri tepung tapioka yang masih mengandung karbohidrat dalam bentuk pati sebesar 70,37%, amilosa 17,22% dan amilopektin 53,15%. Onggok berpotensi untuk diolah menjadi sirup fruktosa melalui proses hidrolisis pati yang dilanjutkan dengan isomerisasi gula hidrolisat. Penelitian ini bertujuan untuk menentukan pH dan suhu optimum isomerisasi pembuatan sirup fruktosa dari hidrolisat onggok melalui eksperimen dan analisis Response Surface Methodology (RSM). Proses hidrolisis untuk memecah pati menjadi glukosa dilakukan secara enzimatis, sedangkan isomerisasi untuk mengubah glukosa menjadi fruktosa dilakukan menggunakan katalis hidrotalsit Mg/Al yang disintesis sendiri. Variasi pH dan suhu isomerisasi ditentukan menggunakan desain eksperimen RSM. Dari percobaan didapatkan bahwa kondisi optimum isomerisasi yaitu pada pH 7 dan suhu 120 oC dengan yield sebesar 36,19% dan selektivitas sebesar 25,88%. Selanjutnya, melalui contour plot dan surface plot dari analisis RSM dapat diprediksi bahwa yield dan selektivitas fruktosa dapat mencapai masing-masing sebesar 17,87% dan 35,07% pada pH 6,58 dan suhu 126,2 °C.
Kuat Tekan Self-Healing Concrete Berbasis Enkapsulasi Xanthan Gum Hafizh, Muhammad; Mauludin, Luthfi Muhammad; Keryanti, Keryanti; Susanto, Ambar
Borneo Engineering : Jurnal Teknik Sipil Volume 8 Nomor 3 Tahun 2024
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v8i3.5877

Abstract

This study aims to determine the reaction and performance of self-healing concrete using Bacillus megaterium encapsulation with xanthan gum coating through a simple extrusion method. The focus of the study is on the effect of adding xanthan gum microcapsules on the compressive strength of concrete and determining the optimal microcapsule content. The percentage of xanthan gum microcapsules used is 1,2,3,4, and 5%. Based on the test results, the addition of 2% xanthan gum microcapsules provides the highest compressive strength, which is 25.6 MPa on the 7th day and 34.1 MPa on the 28th day. Further test results show that although the addition of 5% microcapsules provides the greatest strength return, the use of higher amounts of microcapsules actually reduces the overall concrete strength. Therefore, the optimal microcapsule content to be added to the concrete mixture is 2%, which provides the best balance between increasing strength and material stability.
Penyediaan Alat Penghancur Sampah Organik agar Maggot Lebih Maksimal Mengolah Sampah Menjadi Pupuk Kompos Chamidy, Harita Nurwahyu; Astor, Yackob; Keryanti, Keryanti; Min, Joe Lian; Djatnika, Tjetjep; Pudin, Apip; Amalia, Dewi
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 14, No 3 (2023): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v14i3.12884

Abstract

Longsornya Tempat Pembuangan Akhir (TPA) Sarimukti membuat tumpukan sampah di Tempat Pembuangan Sampah (TPS) semakin menggunung dan munculnya TPS liar yang dapat mencemari lingkungan. Alternatif pengolahan sampah organik yaitu dengan memanfaatkan maggot. Jika tersedia sarana pengolahan sampah yang lengkap dan budidaya Maggot dilakukan secara benar, maka berpotensi dapat mengatasi permasalahan sampah dan menghasilkan keuntungan. Mitra telah mencoba melakukan pengolahan sampah organik menggunakan Maggot. Namun, masih ada permasalahan yang terjadi pada Mitra Pengabdian kepada Masyarakat (PkM) yaitu tidak adanya alat penghancur sampah sehingga tidak dapat diolah maksimal oleh Maggot. Kegiatan PkM ini yaitu melakukan sosialisasi mengajak warga untuk memilah sampah organik dan anorganik di rumah masing-masing, kemudian mendistribusikan sampah ke lokasi pengolahan, dan pembuatan alat penghancur sampah organik. Manfaat kegiatan PkM bagi Mitra adalah memberikan kontribusi berupa teknologi peralatan penghancur sampah dan bertambah banyak masyarakat yang berkontribusi dalam pengelolaan ini sebagai solusi pengolahan sampah yang efektif, efisien, murah, dan dapat memberikan keuntungan bersama.
Hydrolysis of Waste Cooking Oil Using Rhizopus oryzae to Produce Free Fatty Acids Manfaati, Rintis; Connery Manurung, Prans; Muhamad Nur Rojab; Keryanti, Keryanti
Fluida Vol. 16 No. 1 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i1.4496

Abstract

Waste cooking oil is waste produced from palm oil after it has been heated and fried at high temperatures, and it can pollute the environment. One effort to reuse waste cooking oil is a fermentation processe that produces free fatty acids with the help of Rhizopus oryzae as a biocatalyst. Variations in initial substrate concentration ranged from 10 g/L to 70 g/L, followed by varied types of nitrogen sources, namely malt extract, beef extract, (NH2)2CO, NH4Cl, and (NH4)2SO4 at a concentration of 70 g/L to determine free fatty acid concentration. Fermentation was carried out for 7 days. The analysis carried out included the concentration of free fatty acids, biomass, and YP/X value. The optimum initial used cooking oil substrate was obtained at a concentration of 30 g/L with a YP/X value of 13.63%, a free fatty acid concentration of 2.13 g/L and a dry cell weight of 15.48 g/L. The best nitrogen source is beef extract with a Yp/x value of 11.78%, a free fatty acid concentration of 2.02 g/L and a dry cell weight of 17.0 g/L
Biogasoline Production from Shallot Skin Waste with KOH-Clay Catalyst to Create Clean Energy Keryanti, Keryanti; Amalia, Dhea Nurul; Indrita Putri, Anindya; Marhani, Della Agustia; Amalia, Putri Vina; Rizki, Anwar Muhamad
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.v16i2.4591

Abstract

Finding alternative fuels to replace fossil fuels has been made easier by the rise in the consumption of fuels like petrol and the fall in the production of national petroleum exploration activities. This research has been prompted using biomass as an alternative fuel. The primary raw material is shallot skin waste because it has enough lignocellulosic content to be used, one of which is to manufacture biogasoline by using the characteristics of petrol E10. A KOH-Clay catalyst is employed in a thermal and catalytic reaction to influence the reaction's pace. Starting with raw material preparation, conversion procedure, purification, and investigation of the physical properties of biogasoline at specific temperature fluctuations for an hour, the KOH-Clay catalyst is pretreated and characterised. It was discovered through this research that the montmorillonite KOH-Clay content was 5.73, indicating that the catalyst is hygroscopic and absorbs non-polar molecules, making it suitable for use as a catalyst with a pH of 6. As a result, at 60°C temperature circumstances, the best%yield results were attained of 35.025%. While the density value (0.950 gr/cm3) and colour (specific gravity, brownish yellow, and clear/bright) of the experimental results do not meet predetermined standards, they do when viewed from the viewpoint of physical parameters such as specific gravity (0.8358), oAPI biogasoline (37.794), and calorific value (18807.65 Btu/Ib). However, leftover shallot peels generally have the potential to be utilised as clean renewable energy.
Co-Authors Abdilah, Fauzi 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 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 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