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Title: Optimization of banana crop by-products solvent extraction for the production of bioactive compounds
Authors: Díaz Guzmán, Sara Ester 
Benítez Vega, Antonio Nizardo 
Ramírez Bolaños, Sara 
Robaina Robaina, Lidia Esther 
Ortega Medina, Zaida Cristina 
UNESCO Clasification: 331005 Ingeniería de procesos
Keywords: Antioxidant extraction
Banana wastes
Biomass valorization
DPPH activity
Polyphenolic compounds, et al
Issue Date: 2021
Project: FPU15/03138
Journal: Biomass Conversion and Biorefinery 
Abstract: The aim of this work is the optimization of phenolic compound extraction from three by-products of banana crops (rachis, discarded banana, and banana’s pseudostem pulp), as a way to valorize them through a green extraction process. The influence of the temperature and aqueous ethanol concentration (Et-OH) on extract properties (total phenol content (TPC) and antioxidant activity) was firstly analyzed. 78 ℃ and ethanol concentrations close to 50% yielded the best results for the three materials. The equations obtained by the response surface methodology gave a satisfactory description of the experimental data, allowing optimizing the extraction conditions. Under optimized conditions, time influence was then assessed, although this parameter seemed not influence results. Among the three by-products, rachis extract (60% Et-OH, 78 ℃, and 30 min) presented the highest TPC (796 mg gallic acid/100 g of dried material) and antioxidant activity (6.51 mg Trolox equivalents/g of dried material), followed by discarded banana, and pseudostem pulp. Under the optimal conditions, experiments were performed at a larger scale, allowing to determine the extraction yields (EY) and to characterize the extracts. The highest EY was obtained for the rachis (26%), but the extract with the highest activity was obtained for discarded banana (50% Et-OH, 78 ℃, and 60 min), which presented a TPC of 27.26 mg/g extract corresponding to 54.59 mg Trolox equivalents/g extract. This study contributes to the valorization of banana crops residues as a source of polyphenolic compounds with bioactive functions that can be extracted under economic extraction conditions.
ISSN: 2190-6815
DOI: 10.1007/s13399-021-01703-7
Source: Biomass Conversion and Biorefinery [ISSN 2190-6815], (Julio 2021)
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