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All Journal Reaktor TEKNIK METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Bulletin of Chemical Reaction Engineering & Catalysis Seminar Nasional Teknik Kimia Kejuangan Majalah Ilmiah MOMENTUM JITEK (Jurnal Ilmiah Teknosains) Jurnal Aplikasi Teknologi Pangan Indonesia Journal of Halal Abdimas UNWAHAS : Jurnal Pengabdian Masyarakat UNWAHAS Jurnal Inovasi Teknik Kimia ASEAN Journal of Chemical Engineering Jurnal Profesi Insinyur Indonesia Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN

Dyah Hesti Wardhani

Chemical Engineering Department, Faculty Of Engineering, Diponegoro University, Jl. Prof. Sudarto, Tembalang-Semarang, 50275, Telp/fax: (024)7460058/(024)76480675

Author-ID : 412737

Religion Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Social Sciences Transportation Veterinary Other

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Kinetics and Thermodynamics of Ultrasound-Assisted Depolymerization of κ-Carrageenan Ratnawati Ratnawati; Aji Prasetyaningrum; Dyah Hesti Wardhani
Bulletin of Chemical Reaction Engineering & Catalysis 2016: BCREC Volume 11 Issue 1 Year 2016 (April 2016)
Publisher : Department of Chemical Engineering - Diponegoro University

The ultrasound-assisted depolymerization of κ-carrageenan has been studied at various temperatures and times. The κ-carrageenan with initial molecular weight of 545 kDa was dispersed in water to form a 5 g/L solution, which was then depolymerized in an ultrasound device at various temperatures and times. The viscosity of the solution was measured using Brookfield viscometer, which was then used to find the number-average molecular weight by Mark-Houwink equation. To obtain the kinetics of κ-carrageenan depolymerization, the number-average molecular weight data was treated using midpoint-chain scission kinetics model. The pre-exponential factor and activation energies for the reaction are 2.683×10-7 mol g-1 min-1 and 6.43 kJ mol-1, respectively. The limiting molecular weight varies from 160 kDa to 240 kDa, and it is linearly correlated to temperature. The results are compared to the result of thermal depolymerization by calculating the half life. It is revealed that ultrasound assisted depolymerization of κ-carrageenan is faster than thermal depolymerization at temperatures below 72.2°C. Compared to thermal depolymerization, the ultrasound-assisted process has lower values of Ea, ΔG‡, ΔH‡, and ΔS‡, which can be attributed to the ultrasonically induced breakage of non-covalent bonds in κ-carrageenan molecules.

Kinetic Study of Saponin Extraction from Sapindus rarak DC by Ultrasound-Assisted Extraction Methods Aininu Nafiunisa; Nita Aryanti; Dyah Hesti Wardhani
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 2 Year 2019 (August 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Saponin is an important plant-derived compound that is commonly found in sapindaceae plants, such as Sapindus rarak DC. Saponin is extensively used in plenty of industries as a detergent or emulsifying agent in cleansers, shampoos, and cosmetics. The extraction of saponin was previously studied and shows that the extraction assisted by ultrasonic waves was found to be an effective method. However, the previous studies have rarely examined the extraction kinetic study of the ultrasound-assisted extraction (UAE). In the present study, the extraction of saponin from Sapindus rarak DC and its extraction kinetics is conducted. The results show that the highest saponin yield of 354.92 (mg of saponin per gram of dry feed) was obtained from the extraction using a solid-to-liquid (S/L) ratio of 1:50 (w/v) at 50 °C. The amount of extracted saponin increased with the increase of extraction temperature as well as the solute ratio in the solution. However, increasing the temperature to 60 °C decreased the saponin yield. The results of a simple kinetics study of saponin extraction also show that the second-order kinetics model can better describe the UAE process, with an R2 value of 0.929 and a rate coefficient of 0.00495 L.g-1.min-1. The experimental results agree well with the practical calculations obtained using the second-order kinetics model based on an average error of 6.79%.

Co-Authors . Widayat A Abdullah Abdullah Abdullah Aininu Nafiunisa Aji Prasetyaningrum Aji, Satriyo Amelia Maharani Aminuyati Andri Cahyo Kumoro Ardha Eri Yuliana Ariel Arif Atmadja Arunizal, Sultan Atiqoh Sabrina Dewi Bakti Jos Christo Rinaldy Nugraha Denni Kartika Sari Dessy Kurniawati Dharsono, Nikolaus Dharmawan Diana Catur Maharani Didi Dwi Anggoro Diyono Ikhsan Eko Agus Prasetyo Farisa Sirtika Ramadhan Fatoni Nugroho Fauzan FIrfandy, Fauzan Febrian Murvianto Hadiyanto Hadiyanto Hana L Ulya Hanifah Rahim Heri Cahyono Heri Cahyono Heri Cahyono Heru Susanto Hesti Rahayu I. Istadi Indah Prihatiningtyas Iqbal Syaichurrozi Ken Dimas Yogananda Lucia H Rahayu Lucia Hermawati Rahayu Luqman Buchori Maila Yesti Kuswandari Netty Handayani Nita Aryanti Nita Indriyani Nur Rokhati Nurcahyani, Septra Olivia Anastria Permanadewi, Indrasukma Rahmania, Yusi Luluk Ratna Paramitha Sari Ratna Purwaningsih Ratnawati Ratnawati Ratnawati Ratnawati Septia Tri Wulandari Suherman Suherman Winda Tria Meiliana, Winda Tria Windarta, Jaka Yulfin, Muhammad Dhani

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Journal : Bulletin of Chemical Reaction Engineering