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Green products from herbal medicine wastes by subcritical water treatment.
Jouyandeh, Maryam; Tavakoli, Omid; Sarkhanpour, Reza; Sajadi, S Mohammad; Zarrintaj, Payam; Rabiee, Navid; Akhavan, Omid; Lima, Eder C; Saeb, Mohammad Reza.
  • Jouyandeh M; Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
  • Tavakoli O; School of Chemical Engineering, College of Engineering, University of Tehran, Tehran 14176, Iran.
  • Sarkhanpour R; School of Chemical Engineering, College of Engineering, University of Tehran, Tehran 14176, Iran.
  • Sajadi SM; Department of Nutrition, Cihan University-Erbil, Kurdistan Region, Erbil P.O. Box 625, Iraq; Department of Phytochemistry, SRC, Soran University, Soran P.O. Box 624, Iraq.
  • Zarrintaj P; School of Chemical Engineering, Oklahoma State University, 420 Engineering North, Stillwater, OK, 74078, United States.
  • Rabiee N; Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran.
  • Akhavan O; Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran.
  • Lima EC; Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Goncalves 9500, Postal Box, 15003, ZIP, 91501-970 Brazil. Electronic address: profederlima@gmail.com.
  • Saeb MR; Department of Polymer Technology, Faculty of Chemistry, Gdansk University of Technology, G. Narutowicza 11/12 80-233, Gdansk, Poland. Electronic address: mrsaeb2008@gmail.com.
J Hazard Mater ; 424(Pt A): 127294, 2022 02 15.
Article in English | MEDLINE | ID: covidwho-1415558
ABSTRACT
Herbal medicine wastes (HMWs) are byproducts of medicine factories, which are mainly landfilled for their environmental problems. Only bearing in mind the contamination and concerns caused by the COVID-19 pandemic and environmental emissions, the worth of herbal medicine wastes management and conversion to green products can be understood. In this work, subcritical water treatment was carried out batch-wise in a stainless tube reactor in the pressure range of 0.792-30.0 MPa, varying the temperature (127-327 °C) and time (1-60 min) of extraction. This resulted in new and green material sources, including organic acids, amino acids, and sugars. Amazingly, at very low extraction times (below 5 min) and high temperatures (above 277 °C), about 99% of HMWs were efficaciously converted to clean products by subcritical hydrothermal treatment. The results of hydrothermal extraction after 5 min indicated that at low temperatures (127-227 °C), the total organic carbon in the aqueous phase increased as the residual solid phase decreased, reaching a peak around 220 °C. Acetone soluble extracts or fat phase appeared above 227 °C and reached a maximum yield of 21% at 357 °C. Aspartic acid, threonine, and glycine were the primary amino acids; glycolic acid, formic acid, lactic acid, and acetic acid were obtained as the main organic acids, glucose, fructose, and cellobiose were substantial sugars produced from the aqueous phase after 5 min of hydrothermal subcritical hydrolysis extraction.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Water Purification / COVID-19 / Medical Waste Topics: Traditional medicine Limits: Humans Language: English Journal: J Hazard Mater Journal subject: Environmental Health Year: 2022 Document Type: Article Affiliation country: J.jhazmat.2021.127294

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Water Purification / COVID-19 / Medical Waste Topics: Traditional medicine Limits: Humans Language: English Journal: J Hazard Mater Journal subject: Environmental Health Year: 2022 Document Type: Article Affiliation country: J.jhazmat.2021.127294