scholarly journals VALORIZATION OF WASTE COFFEE HUSKS: RECOVERY OF BIOACTIVE COMPOUNDS USING A GREEN EXTRACTION METHOD

Author(s):  
Ádina Lima de Santana ◽  
Gabriela Alves Macedo
2021 ◽  
Vol 43 ◽  
pp. e55564
Author(s):  
Suelen Siqueira dos Santos ◽  
Carolina Moser Paraíso ◽  
Letícia Misturini Rodrigues ◽  
Grasiele Scaramal Madrona

Blueberry and raspberry pomace are a rich source of bioactive compounds that have not been commercially utilized yet, and ultrasound-assisted technology can efficiently extract these compounds. Also, the use of water as a solvent added to the ultrasound-assisted technology improves this eco-friendly process. Therefore, an aqueous eco-friendly extraction, including extraction time and ultrasound presence or absence (conventional extraction) was performed in order to extract bioactive compounds from blueberry and raspberry pomace. Response parameters included levels of anthocyanins, phenolic compounds, and flavonoids, and antioxidant activity determined by DPPH, ABTS, and FRAP methods. Analysis of variance results indicated that ultrasound-assisted extraction for 45 min. was feasible to extract the bioactive compounds. The antioxidant content of the extract obtained by the ultrasound-assisted process was 1.4 times higher on average and the total phenolic concentration was 1.6 times higher (for blueberry 5.02 and for raspberry 2.53 mg gallic acid equivalent/g) compared with those obtained by the conventional process. Thus, the ultrasound-assisted extraction method can be a profitable alternative to extract bioactive compounds from blueberry and raspberry pomace, as it is energy efficient, requires fewer chemicals, and produces less effluent. This eco-friendly technology is therefore viable for food, nutraceutical, and cosmetic industries, and also for reducing food waste.


2016 ◽  
Vol 53 (11) ◽  
pp. 3939-3947 ◽  
Author(s):  
Ioannis Mourtzinos ◽  
Eleni Anastasopoulou ◽  
Athanasios Petrou ◽  
Spyros Grigorakis ◽  
Dimitris Makris ◽  
...  

2012 ◽  
Vol 40 (1) ◽  
pp. 93 ◽  
Author(s):  
Liliana GITIN ◽  
Rodica DINICA ◽  
Raluca PARNAVEL

In order to characterize the composition of bioactive compounds in Allium spp., an important source of traditional foods, analysesof their physicochemical properties, total phenols, and flavonoid content were carried out using three of the most popular Romanian leafvarieties (Allium cepa var. ‘Diamant’, ‘Rubiniu’, and Allium ursinum L.). The highest levels of bioactive compounds were detected in theleaves of Allium ursinum L., 7.2730 mg QE/ kg fresh plant and 27.8884 g GAE/100 g dry basis, respectively. This study suggests potentialgood uses of the fresh leaves of Romanian Allium spp. as condiments, ingredients or preservatives in the food industry.


Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4672
Author(s):  
Nour El Houda Lezoul ◽  
Mohamed Belkadi ◽  
Fariborz Habibi ◽  
Fabián Guillén

The extraction of secondary metabolites by water, MeOH:water (8:2) containing NaF, methanol, ethanol and acetone (all of them diluted (7:3) in water)from the different parts (leaves, flowers, stems and roots) of Passiflora caerulea L., Physalis peruviana L. and Solanum muricatum Aiton via decoction and maceration methods was studied. The highest extraction yields were recorded by methanol for decoction and acetone for maceration. The total polyphenol content (TPC) obtained by decoction had the highest TPC contents, and MeOH containing NaF was the best solvent for the extraction of TPC. Maceration was suitable for flavonoid extractions, with ethanol and acetone being the best solvents. In general, the highest levels of TPC and flavonoids were obtained from Passiflora leaves regardless of the solvent or extraction method applied. Furthermore, the roots of Physalis and Solanum showed important levels of these compounds in consonance with the total antioxidant activity (TAA) evaluated in the different organs of the plant in the three species. In this study, the solvents and extraction methods applied were tools that determined significantly the level of extraction of bioactive compounds, showing a different impact on plant organs for each medicinal species studied.


Antioxidants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 597 ◽  
Author(s):  
Nerea Jiménez-Moreno ◽  
Francesca Volpe ◽  
Jose Antonio Moler ◽  
Irene Esparza ◽  
Carmen Ancín-Azpilicueta

The use of grape stems for the extraction of bioactive compounds to be used in the pharmaceutical, food, and cosmetic industries is a promising objective. The aim of this work is to determine the influence of the different extraction conditions (temperature, ethanol concentration, and ratio of sample/solvent) on phenolic composition and antioxidant capacity of Mazuelo stem extracts. In general, the ethanol concentration of the extraction solvent was the factor that had the greatest influence on the extraction of different bioactive compounds. The greatest content of total phenolic compounds and the highest antioxidant activity of the extracts were obtained with 50% ethanol and at 40 °C. The most abundant compound found in the different extracts obtained from Mazuelo grape stem was (+)-catechin, but appreciable concentrations of gallic acid, a quercetin derivative, and stilbenes (trans-resveratrol and trans-ε-viniferin) were also extracted. Quercetin and malvidin-3-glucoside showed the highest correlation with the antioxidant capacity of the extracts, while stilbenes did not present such relation. The maximum concentration of gallic acid was extracted with water but the extraction of most of the compounds was maximum on using 50% ethanol. Consequently, the selection of the extraction method to be used will depend on the particular compound to be extracted in greatest quantity.


2018 ◽  
Vol 48 (6) ◽  
Author(s):  
Caroline Pagnossim Boeira ◽  
Natiéli Piovesan ◽  
Marcela Bromberger Soquetta ◽  
Déborah Cristina Barcelos Flores ◽  
Bruna Nichelle Lucas ◽  
...  

ABSTRACT: The aim of this study was to evaluate the effect of extraction conditions on bioactive compounds, as well as on antioxidant activity, and the antimicrobial activity of the extracts with the highest antioxidant characteristics. The extracts were obtained by conventional method and ultrasound-assisted extraction at various temperatures (20°C, 40°C and 60°C). Total phenolics, total flavonoids, antimicrobial activity and antioxidant activity were quantified by the methods of DPPH, FRAP, and ORAC, respectively. The conventional extraction method and ultrasound method influenced the phenolic content at all the tested temperatures. Flavonoids were not influenced by extraction methods. The antioxidant activity (DPPH) was highest in the ultrasonic method at temperatures of 40°C and 60°C; however, in the case of the FRAP method the best results were for the conventional extraction method. The conventional and ultrasonic methods did not influence the IC50 at temperatures of 20°C and 40°C, but using ORAC the antioxidant activity was influenced by the methods at all temperatures. The extract obtained at 60°C by the ultrasound method had high antimicrobial action in relation to the strains of Salmonella sp., Escherichia coli, and Staphylococcus aureus. Extraction ultrasonic-assisted can be considered adequate to obtain extracts of marcela, which are rich in bioactive compounds with high antioxidant activity.


Plants ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 41
Author(s):  
Veronica Santarelli ◽  
Lilia Neri ◽  
Katya Carbone ◽  
Valentina Macchioni ◽  
Paola Pittia

This study investigated the use of conventional and innovative extraction methods to produce food-grade hop extracts with high antioxidant capacity and content in bioactive compounds. Conventional extractions (CONV) were performed under dynamic maceration at 25 and 60 °C; innovative extractions were performed using two ultrasound systems, a laboratory bath (US) and a high-power ultrasound bath (HPUS), and a high-pressure industrial process. For CONV, US, and HPUS extractions the effect of the extraction time was also tested. Experimental results showed that extraction method, temperature, and time affect to a different extent the phenolic profile and have a significant effect (p < 0.05) on the total phenolic content, total flavonoid content, antiradical capacity (ABTS), chlorophyll α, and total carotenoids content. Overall, US and CONV 60 °C extractions showed the highest extraction efficiency for almost all the investigated compounds, however, the extraction method and time to be used strongly depends on the target compounds to extract.


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