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All Journal TEKNIK Communications in Science and Technology Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Journal of Vocational Studies on Applied Research International Journal of Renewable Energy Development Jurnal Sains Materi Indonesia
Aji Prasetyaningrum
Department of Chemical Engineering, Diponegoro University, Jl. Prof. Soedarto, Kampus Undip Tembalang, Semarang 50239
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Effect of ultrasound-advanced oxidation processes for pretreatment of oil palm mesocarp fiber for cellulose extraction Anggoro, Didi Dwi; Prasetyaningrum, Aji; Udaibah, Wirda; Imtinan, Alifa Bakhitah; Nabilah, Farhanah; Le Monde, Brilliant Umara
International Journal of Renewable Energy Development Vol 13, No 3 (2024): May 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60027

Abstract

Palm mesocarp fiber, a by-product of the palm oil industry, holds significant potential as a cellulose source for biofuel, biopolymer, and biocomposite production. However, its utilization is hampered due to the presence of lignin, which covers the cellulose. The use of ozone promotes a high level of lignin degradation, making it efficient in breaking down lignin bonds in lignocellulose. However, the ozonation method has low ozone mass transfer. This deficiency can be overcome with ultrasonic waves because of the cavitation phenomenon that can expand the contact surface of ozone and lignocellulose. The ozonation-ultrasonic hybrid method is used to remove lignin. This research investigates the use of a hybrid ozonation-ultrasonic method with the effect of reaction time and pH under acidic conditions on the pretreatment of palm oil mesocarp fiber. This process was carried out at reaction times (70, 80, and 90 minutes) and solution pH (4, 5, and 6) with an ozone flow rate of 2 L min-1. The cellulose content was analyzed using the Chesson method. The results showed a decrease in lignin and an increase in cellulose, which was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) analysis shows a decrease in the lignin absorption peak at 1635 cm-1 and 1420 cm-1. XRD analysis showed an increase in crystallinity after pretreatment, with lignin degradation observed at 6.35%. SEM Morphological showed a more friable, stable, and porous surface after pretreatment, indicating the presence of perforations in the cell walls and the damage to the lignin structure. Therefore, this research succeeded in reducing the use of chemicals in the biomass waste delignification process. The ozonation-ultrasonic hybrid pretreatment process, which aims to degrade lignin in palm fiber biomass, shows promising results, producing high cellulose content in palm fiber by reducing the amount of chemicals as mostly used in conventional processes.
Effect of microwave and ultrasonic irradiation on the enzymatic hydrolysis of water hyacinth biomass in the presence of surfactants Rokhati, Nur; Ratnawati; Prasetyaningrum, Aji; Anggraini, Widyah; Nugroho, Akbar; Novita, Nasyriyatul Hana; Andarani, Pertiwi; Riyanto, Teguh
Communications in Science and Technology Vol 8 No 1 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.1.2023.1143

Abstract

This paper presents the effect of microwave and ultrasound irradiation on the enzymatic hydrolysis of water hyacinth biomass in the presence of surfactants. Prior to hydrolyzing, the water hyacinth was treated utilizing alkali with and without microwave assistance. It was revealed that the microwave improved the removal of lignin and hemicellulose. The treated water hyacinth biomass was also characterized using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), and Fourier-Transform Infrared (FT-IR) Spectroscopy. The effect of surfactant and the assistance of microwave and ultrasound were comprehensively studied. Some parameters varied, including stirring speed, surfactant type, concentration, and reaction time. The results indicated that microwave and ultrasound could enhance the reaction rate. Tween 80 here could improve conventional, microwave-assisted, and ultrasound-assisted hydrolysis of water hyacinth biomass. It was found that the ultrasound-assisted hydrolysis was better than that of others. The results of this research can be used as the groundwork for further developing the lignocellulosic biomass hydrolysis process, especially in an advanced enzymatic hydrolysis process.
Double Emulsion Based Alginate/Chitosan Prepared by Ultrasound for Bioactive Encapsulation Prasetyaningrum, Aji; Ashianti, Aulia Dwi; Rokhati, Nur; Setyaningsih, Yuliani
Jurnal Sains Materi Indonesia Vol. 26 No. 2 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.9018

Abstract

Water-in-oil-in-water (W/O/W) emulsion is an effective technology for encapsulating bioactivity but has poor stability. This study aims to evaluate the effect of ultrasonication on the preparation of double emulsions with varying alginate/chitosan ratios (1:1, 1:2, 2:1) and sonication times between 0 and 7 minutes. The results showed that a sonication time of 7 minutes resulted in the best storage stability (0.00–1.02%) and thermal stability (17.13–23.21%), a significant decrease in droplet size (2.08–2.87 μm), and higher emulsion activity index (EAI) (16.11–38.10 m2/g) and emulsion stability index (ESI) (63.28–89.74 min) values. The alginate/chitosan ratio of 2:1 also gave the most optimal results with storage stability of 4.58%, thermal stability of 36.23%, droplet size of 2.08–4.14 μm, and EAI and ESI values of 16.12 m2/g and 48.42 min. The ultrasonic-assisted alginate/chitosan double emulsion method effectively improved the stability and bioavailability of bioactive and presents significant potential for food and pharmaceutical applications.
The Role of Algae in Biofuel Production: Potentials and Challenges for Sustainable Transportation Sari, Dessy Agustina; Djaeni, Moh.; Hadiyanto, Hadiyanto; Prasetyaningrum, Aji
TEKNIK Vol 46, No 1 (2025) January 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67532

Abstract

This study aims to explore the potential of algae for sustainable biofuel production by examining their molecular biology and the use of advanced cultivation techniques. As concerns over greenhouse gas emissions and rising transportation energy costs grow, algae offer a promising alternative for fuel derived from both food and non-food sources. This review looks at the main biological pathways involved in making biofuels from algae. It focuses on species diversity, lipid content, and new technologies like photobioreactors and magnetic nanoparticle harvesting. The results showcase noteworthy advancements in biotechnology and genetic engineering that boost algae productivity and fuel yield, while also critically examining the environmental impacts such as CO2 emissions and water use, as well as the economic and policy challenges through a life cycle analysis. Adopting a global perspective, this review emphasizes the role of international collaboration and technology transfer in overcoming barriers. Conclusion: Algae-based biofuels hold considerable potential for reducing CO2 and supporting sustainable transportation, yet scaling up production and lowering costs remain challenges. Future research should focus on improving integrated biorefinery platforms, exploring CO2 capture, and promoting international partnerships.
Optimization Extraction of Anthocyanin from Roselle as a Natural Colorant using Natural Deep Eutectic Solvent with Microwave Assisted Extraction Method Kurnianto, Ade; Prasetyaningrum, Aji; Paramita, Vita
Journal of Vocational Studies on Applied Research 2025: Just Accepted Manuscript and Article In Press 2025
Publisher : Vocational College of Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jvsar.v0i0.26556

Abstract

Roselle (Hibiscus sabdariffa L.) contains high levels of anthocyanins with significant antioxidant properties. However, conventional extraction methods often result in low efficiency and degradation of bioactive compounds. This study aims to optimize the extraction of anthocyanins from roselle using Microwave Assisted Extraction (MAE) with Natural Deep Eutectic Solvent (NADES) combination of sodium acetate and glycerin then examine the effect of optimum anthocyanin content. The variables applied were microwave power (200, 400, 600 Watt) and extraction time (4, 6, 8 min), optimized using Response Surface Methodology (RSM) with 12 experimental runs. Analysis included antioxidant content (anthocyanins, vitamin C, tannins, and total phenolics) and stability tests (density and viscosity). The RSM results have shown that the optimization value of anthocyanin content is 0.3217%, which will be achieved at an extraction time of 6.02 min, and microwave assisted extraction power at 323.77 Watt. The result of the optimum anthocyanin variable shows anthocyanin content is 0.3072% confirming the model's accuracy. MAE combined with NADES provides an efficient and environmentally friendly method for extracting natural colorants with high antioxidant activity from roselle.
STRATEGI PENGEMBANGAN DESA WISATA DALEMAN SEBAGAI DESTINASI WISATA SEHAT Maulana, Hakim Anang; Martino, Martino; Lubis, Nazwa Syalsabilla; Susanto, Novita; Wijaya, Safira Febe; Santosa, Ari Wibawa Budi; Djaeni, Moh.; Prasetyaningrum, Aji
Jurnal Pasopati Vol 6, No 2 (2024): Vol 6, No 2 (2024)
Publisher : Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/pasopati.2024.24991

Abstract

Desa Wisata Daleman yang terletak di Kecamatan Tulung, Kabupaten Klaten, Jawa Tengah memiliki potensi wisata keindahan alam berupa wisata mata air Umbul Nilo. Kawasan mata air ini memiliki potensi alam yang indah dan suasana yang asri, tetapi perkembangannya masih tertinggal dibandingkan desa wisata sekitar. Dalam pengembangannya, wisata ini menghadapi berbagai tantangan seperti kurangnya penataan dan daya tarik visual serta keterbatasan fasilitas penunjang yang mampu menarik minat wisatawan. Oleh karena itu, dilakukan perancangan kembali desain tata letak yang lebih menarik disertai beberapa fasilitas penunjang sekaligus untuk meningkatkan pengalaman wisata yang nyaman dan aman. Selain itu, dilakukan identifikasi potensi kuliner sehat yang dapat dikembangkan di Desa Daleman. Metode pengabdian yang diterapkan mencakup observasi ke lapangan, studi literatur pengembangan potensi desa, perancangan desain, dan penyuluhan kepada masyarakat. Hasil perancangan ini dapat dijadikan acuan untuk pembangunan selanjutnya secara bertahap. 
Co-Authors Anggraini, Widyah Ari Wibawa Budi Santosa Ashianti, Aulia Dwi Dessy Agustina Sari Didi Dwi Anggoro Hadiyanto Hadiyanto Imtinan, Alifa Bakhitah Kurnianto, Ade Le Monde, Brilliant Umara Lubis, Nazwa Syalsabilla Martino, Martino Maulana, Hakim Anang Moh. Djaeni Nabilah, Farhanah Novita, Nasyriyatul Hana Nugroho, Akbar Nur Rokhati Pertiwi Andarani RATNAWATI Riyanto, Teguh Susanto, Novita Vita Paramita Wijaya, Safira Febe Wirda Udaibah Yuliani Setyaningsih