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Waste and Biomass Valorization

, Volume 10, Issue 3, pp 533–546 | Cite as

A Green Valorisation Approach Using Microwaves and Supercritical CO2 for High-Added Value Ingredients from Mandarin (Citrus deliciosa Tenore) Leaf Waste

  • Fadime Ateş
  • Selin ŞahinEmail author
  • Zeynep İlbay
  • Ş. İ. Kırbaşlar
Original Paper
  • 137 Downloads

Abstract

The present study aims to increase the efficiency of a resource from waste to health by valorisation of it through cleaner, eco-friendly and less energy-consuming technical processes such as microwave-asissted (MAE) and supercritical fluid (SFE) extractions. On the other hand, optimization of the processes have been applied utilizing multivariate statistic technique such as Response surface Methodology (RSM) in order to consider any possible interaction between variables with less number of experiments as well as to model a response affected by several variables. The outcome of the present study indicates that the optimum conditions for MAE were 275 W of microwave power together with 2 g mandarin leaf for 45 s; regarding SFE, 50 °C, 200 bar and 0.39 mL/min was found as the optimal condition to obtain the maximum yields of each dependent variable such as total phenolic material (TPM) and total flavonoid material (TFM), respectively. Additionally, antioxidant activity values measured by several methods such as cupric ion reducing antioxidant capacity (CUPRAC), 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) were correlated positively with both TPM and TFM in the leaf extracts. Furthermore, scanning electron microscope (SEM) images indicated cell wall disruption in all the treatement groups compared to untreated samples.

Keywords

Agricultural waste Microwave-assisted extraction Supercritical fluid extraction Antioxidant activity Optimization 

Notes

Acknowledgements

The authors wish to thank for the support of the Research Fund of Istanbul University (Bilimsel Araştirma Projeleri Birimi, Istanbul Üniversitesi). Project number is 41685.

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Department of Chemical Engineering, Engineering FacultyIstanbul UniversityIstanbulTurkey
  2. 2.Department of Chemical Engineering, Engineering FacultyUşak UniversityUşakTurkey

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