Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste

In this study, we present a strategy for valorizing lignocellulosic wastes (licorice root and willow bark) that result from industrial extraction of active principles using water as green solvent and aqueous NaOH solution. The wastes were submitted to severe ultrasound (US) and microwave (MW) treatm...

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Autores principales:	Vasile Staicu, Cristina Luntraru, Ioan Calinescu, Ciprian Gabriel Chisega-Negrila, Mircea Vinatoru, Miruna Neagu, Adina Ionuta Gavrila, Ioana Popa
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	lignocellulosic waste valorization licorice root glycyrrhizic acid willow bark salicin derivatives ultrasound Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/0b1239e73b304853a1b464713bbe99d7
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spelling	oai:doaj.org-article:0b1239e73b304853a1b464713bbe99d72021-11-25T19:04:55ZUltrasonic or Microwave Cascade Treatment of Medicinal Plant Waste10.3390/su1322128492071-1050https://doaj.org/article/0b1239e73b304853a1b464713bbe99d72021-11-01T00:00:00Zhttps://www.mdpi.com/2071-1050/13/22/12849https://doaj.org/toc/2071-1050In this study, we present a strategy for valorizing lignocellulosic wastes (licorice root and willow bark) that result from industrial extraction of active principles using water as green solvent and aqueous NaOH solution. The wastes were submitted to severe ultrasound (US) and microwave (MW) treatments. The aim of these treatments was to extract the remaining active principles (using water as a solvent) or to prepare them for cellulose enzymatic hydrolysis to hexoses (performed in an NaOH aqueous solution). The content of glycyrrhizic acid and salicin derivatives in licorice root and willow bark wastes, respectively, were determined. The best results for licorice root were achieved by applying the US treatment for 5 min at 25 °C (26.6 mg glycyrrhizic acid/gDM); while, for willow bark, the best results were achieved by applying the MW treatment for 30 min at 120 °C (19.48 mg salicin/gDM). A degradation study of the targeted compounds was also performed and showed good stability of glycyrrhizic acid and salicin derivatives under US and MW treatments. The soluble lignin concentration prior to enzymatic hydrolysis, as well as the saccharide concentration of the hydrolyzed solution, were determined. As compared with the MW treatment, the US treatment resulted in saccharides concentrations that were 5% and 160% higher for licorice root and willow bark, respectively.Vasile StaicuCristina LuntraruIoan CalinescuCiprian Gabriel Chisega-NegrilaMircea VinatoruMiruna NeaguAdina Ionuta GavrilaIoana PopaMDPI AGarticlelignocellulosic waste valorizationlicorice rootglycyrrhizic acidwillow barksalicin derivativesultrasoundEnvironmental effects of industries and plantsTD194-195Renewable energy sourcesTJ807-830Environmental sciencesGE1-350ENSustainability, Vol 13, Iss 12849, p 12849 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	lignocellulosic waste valorization licorice root glycyrrhizic acid willow bark salicin derivatives ultrasound Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
spellingShingle	lignocellulosic waste valorization licorice root glycyrrhizic acid willow bark salicin derivatives ultrasound Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350 Vasile Staicu Cristina Luntraru Ioan Calinescu Ciprian Gabriel Chisega-Negrila Mircea Vinatoru Miruna Neagu Adina Ionuta Gavrila Ioana Popa Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste
description	In this study, we present a strategy for valorizing lignocellulosic wastes (licorice root and willow bark) that result from industrial extraction of active principles using water as green solvent and aqueous NaOH solution. The wastes were submitted to severe ultrasound (US) and microwave (MW) treatments. The aim of these treatments was to extract the remaining active principles (using water as a solvent) or to prepare them for cellulose enzymatic hydrolysis to hexoses (performed in an NaOH aqueous solution). The content of glycyrrhizic acid and salicin derivatives in licorice root and willow bark wastes, respectively, were determined. The best results for licorice root were achieved by applying the US treatment for 5 min at 25 °C (26.6 mg glycyrrhizic acid/gDM); while, for willow bark, the best results were achieved by applying the MW treatment for 30 min at 120 °C (19.48 mg salicin/gDM). A degradation study of the targeted compounds was also performed and showed good stability of glycyrrhizic acid and salicin derivatives under US and MW treatments. The soluble lignin concentration prior to enzymatic hydrolysis, as well as the saccharide concentration of the hydrolyzed solution, were determined. As compared with the MW treatment, the US treatment resulted in saccharides concentrations that were 5% and 160% higher for licorice root and willow bark, respectively.
format	article
author	Vasile Staicu Cristina Luntraru Ioan Calinescu Ciprian Gabriel Chisega-Negrila Mircea Vinatoru Miruna Neagu Adina Ionuta Gavrila Ioana Popa
author_facet	Vasile Staicu Cristina Luntraru Ioan Calinescu Ciprian Gabriel Chisega-Negrila Mircea Vinatoru Miruna Neagu Adina Ionuta Gavrila Ioana Popa
author_sort	Vasile Staicu
title	Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste
title_short	Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste
title_full	Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste
title_fullStr	Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste
title_full_unstemmed	Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste
title_sort	ultrasonic or microwave cascade treatment of medicinal plant waste
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/0b1239e73b304853a1b464713bbe99d7
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Ultrasonic or Microwave Cascade Treatment of Medicinal Plant Waste

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