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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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PENCEGAHAN PENCOKLATAN ENZIMATIK PADA PORANG KUNING (Amorphophallus oncophyllus) Dyah Hesti Wardhani; Ariel Arif Atmadja; Christo Rinaldy Nugraha
Reaktor Volume 17 No. 2 Juni 2017
Publisher : Dept. of Chemical Engineering, Diponegoro University

Abstract ENZYMATIC BROWNING INHIBITION OF YELLOW PORANG (Amorphophallus oncophyllus). Glucomannan is widely used in the cosmetics, food and health industry due to its high viscosity. One sources of local glucomannan is yellow porang tuber (Amorphophallus oncophyllus). Unfortunately, the content of carotenoids, polyphenoloxidases and tannins of the tuber is high enough and causing brownish color of the flour. Sodium acid pyrophosphat (Na2H2P2O7) or SAPP is a safe whitening agent used as an food additive and categorized as generally recognized as safe (GRAS). The purpose of this work was to study the enzymatic browning inhibition of yellow porang using SAPP as well as its effect on glucomannan content. Extended maceration time up to 3 h did not increase the degree of whiteness and glucomannan levels significantly. 2% of Na2H2P2O7 increased the degrees of whiteness into 50,33. Higher degree of whiteness was obtained in maseration of the flour than that of slurry, wet chips and dried chips. In these three variables, increasing degree of whiteness was in line with the glucomannan content. SAPP provided the highest degree of whiteness (61.48), however, the highest glucomannan samples (75.08%) was obtained at maceration using NaHSO3. Keywords: Amorphophallus oncophyllus; degree of whiteness; glucomannan; yellow porang Abstrak Glukomanan banyak digunakan di industri kosmetik, makanan dan kesehatan karena viskositas yang tinggi. Salah satu sumber glukomanan lokal adalah umbi porang kuning (Amorphophallus oncophyllus). Sayangnya, kandungan karoten, polyphenoloxidases dan tannins pada umbi ini cukup tinggi menyebabkan tepung yang dihasilkan berwarna kecoklatan yang tidak diinginkan oleh pengguna. Sodium acid pyrophosphat (Na2H2P2O7) atau SAPP merupakan bahan pemutih yang aman digunakan sebagai zat additif dan dikategorikan dan termasuk ”generally recognized as safe” (GRAS). Tujuan penelitian ini yaitu mempelajari pencegahan pencoklatan pada porang kuning menggunakan SAPP serta efeknya terhadap kadar glukomanan. Peningkatan waktu maserasi hingga 3 jam tidak meningkatkan derajat putih dan kadar glukomanan secara signifikan. Konsentrasi SAPP 2% memberikan derajat putih 50,33. Maserasi tepung porang memberikan derajat putih tertinggi dibanding maserasi slurry, chips basah maupun chips kering. Pada ketiga variabel tersebut, kenaikan kadar glukomanan sejalan dengan derajat putihnya. Penggunaan SAPP pada tepung menghasilkan derajat putih tertinggi yaitu 61,48 namun kadar glukomanan tertinggi (75,08%) dicapai pada sampel yang dimaserasi menggunakan NaHSO3. Kata kunci: Amorphophallus oncophyllus; derajat putih; glukomanan; porang kuning

KINERJA MEMBRAN ULTRAFILTRASI UNTUK PENGOLAHAN LIMBAH EMULSI MINYAK-AIR SINTETIS Nita Aryanti; Indah Prihatiningtyas; Diyono Ikhsan; Dyah Hesti Wardhani
Reaktor Volume 14, No. 4, OKTOBER 2013
Publisher : Dept. of Chemical Engineering, Diponegoro University

Kegiatan pengilangan minyak bumi untuk memenuhi kebutuhan bahan bakar menghasilkan limbah cair emulsi minyak-air. Pengolahan limbah emulsi minyak-air dengan metode konvensional belum mampu untuk menerapkan prinsip reuse dan recycle karena hasil pengolahan limbah hanya dibuang ke perairan. Selain itu, proses konvensional menimbulkan produk samping berupa sludge yang tidak diinginkan.Membran ultrafiltrasi telah banyak digunakan untuk pengolahan limbah berminyak. Pada penelitian ini digunakan umpan model limbah emulsi minyak dengan fasa terdispersi berupa minyak pelumas, bensin dan solar.Fasa kontinu adalah air, sedangkan surfaktan adalah sebagai mediator.Minyak pelumas, bensin dan solar digunakan untuk mewakili limbah kilang minyak bumi yang berasal dari kolom-kolom distilasi serta limbah yang berasal dari utility plant, misalnya limbah bahan bakar solar.Penggunaan model limbah pengilangan bertujuan untuk mendapatkan pemahaman yang lebih detail tentang kinerja membran ultrafiltrasi untuk pengolahan limbah emulsi minyak bumi. Pengujian kinerja membran ultrafiltrasi dilakukan dengan mengetahui profil fluks dan rejeksi. Karakterisasi membran menunjukkan bahwa membran polyethersulfone yang digunakan merupakan membran ultrafiltrasi asimetrik dengan permeabilitas 17,32 (l/m2.jam.bar). Profil fluks emulsi bensin, minyak pelumas dan solar menunjukkan bahwa penurunan fluks bensin yang tertinggi. Selain itu dapat dilihat bahwa membran polyethersulfone yang digunakan mampu merejeksi COD sebesar 98% dan minyak sebesar 98% untuk umpan emulsi bensin. Untuk emulsi minyak pelumas, 94% COD dan 99% minyak dapat direjeksi, sedangkan untuk umpan emulsi minyak solar, rejeksi COD sebesar 90% dan rejeksi minyak sebesar 98%.

Purification of Glucomannan of Porang (Amorphophallus oncophyllus) Flour using Combination of Isopropyl Alcohol and Ultrasound-Assisted Extraction Dyah Hesti Wardhani; Lucia H Rahayu; Heri Cahyono; Hana L Ulya
Reaktor Volume 20 No.4 December 2020
Publisher : Dept. of Chemical Engineering, Diponegoro University

Porang tuber is rich of glucomannan content but contained irritable compounds to be consumed. Ultrasound-assisted extraction (UAE) using isoprophyl alcohol (IPA) was developed as a purification method for glucomannan. This study aimed to determine the effects of UAE conditions (IPA concentrations, ratios of solvent-solid, and number of extraction stages) on the characteristics of purified glucomannan (PG) from porang flour (PF). Single-stage UAE using 80% IPA concentration and ratio of solvent-solid of 8:1 (ml/g) for 10 min gave the highest glucomannan content (76.10%). At this condition, the PG viscosity and yield were 12,800 cP and 96.10%, respectively. Furthermore, the three-stage UAE using 80% IPA concentration in each stage improved the glucomannan content to 83.26% with 15,960 cP and 90.02% of yield. The morphology showed that the purified glucomannan powders had smoother surface and less crump after the purification. Both carbonyl and acetyl groups were observed on PF and PG in different intensities. Keywords: glucomannan, isopropanol, Amorphophallus oncophyllus, ultrasound-assisted extraction

ULTRASONIC-ASSISTED EXTRACTION OF ANTIOXIDANT PHENOLIC COUMPOUNDS FROM EUCHEUMA COTTONII Dyah Hesti Wardhani; Denni Kartika Sari; Aji Prasetyaningrum
Reaktor Volume 14, No. 4, OKTOBER 2013
Publisher : Dept. of Chemical Engineering, Diponegoro University

The influences of ultrasonic-assisted extraction (UAE) conditions on phenolic compounds of Eucheuma cottonii seaweeed were investigated. The effects of temperature, time and liquid-solid ratio were evaluated based on the total phenolic content (TPC). The result showed a significant variability of effect of temperature, time, and liquid-solid ratio on TPC. Application of ultrasound reduced the optimum temperature, time and liquid-solid ratio of the extraction when compared to the conventional extraction. The highest phenolic content (4.44 mg gallic acid equivalent/g dry weight) was obtained at 3:1(v/w) of liquid-solid ratio, 55oC of temperature and 35 min of extraction time. At this condition, the extract showed ability to scavenging 91% of 1,1-diphenyl 2 picrylhydrazyl (DPPH radical) and 10.9% of H2O2. High ability of the extract to scavenge DPPH radical but low in scavenging H2O2 indicated that the extract dominated by primary antioxidant compounds which work by donating hydrogen atoms to bind free radical.

Co-Authors . Widayat A Abdullah Abdullah 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 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 Suherman, Suherman Winda Tria Meiliana, Winda Tria Windarta, Jaka Yulfin, Muhammad Dhani

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