Yield of Polyphenolic Substances Extracted From Spruce (Picea abies) Bark by Microwave-Assisted Extraction

Sládková, Alexandra; Benedeková, Martina; Stopka, Ján; Šurina, Igor; Ház, Aleš; Strižincová, Petra; Čížová, Katarína; Škulcová, Andrea; Burčová, Zuzana; Kreps, František; Šíma, Jozef; Jablonský, Michal

doi:10.15376/biores.11.4.9912-9921

Cited by 12 publications

(9 citation statements)

References 28 publications

(32 reference statements)

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“…Sládková A. et al conducted a study on P. abies bark extracts attained by MAE, indicating a maximum TPC of 321.1 mg GAE per 100 g dry bark. Although these results showed a lower yield of phenolic compounds compared to our results for the extracts obtained by MAE, it must be mentioned that a different MAE protocol was used [ 46 ].…”

Section: Resultscontrasting

confidence: 81%

Phytochemical Profile and Biological Effects of Spruce (Picea abies) Bark Subjected to Ultrasound Assisted and Microwave-Assisted Extractions

Nișca

Ștefănescu

Stegăruş

et al. 2021

Plants

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The bark of various tree species is a byproduct of the forestry industry that is not used at its full potential, considering the wide range of phytochemicals that are contained in these vegetal matrices and the health benefits that these compounds could provide for society. Our goal was to assess and compare the phytochemical composition of some hydroalcoholic spruce (Picea abies) bark extracts attained by ultrasound assisted extraction (UAE) and microwave-assisted extraction (MAE) and their antioxidant and antibacterial effects. The levels of total phenolics and tannins in the bark extracts were determined using methods based on the Folin–Ciocâlteu reagent, while specific phenolic and volatile compounds were identified and quantified using an UPLC-PDA method and a GC-FID method, respectively. After the chemical composition assessment, the antioxidant capacity (AC) was evaluated by measuring the scavenging ability against two free radicals (DPPH and ABTS). The minimum inhibitory concentration (MIC) was determined to assess the antibacterial activity of the extracts. The results indicated that the extracts produced by UAE had higher contents of polyphenols and tannins and also a higher content of the main phenolic compounds identified, catechin and epicatechin, compared to the MAE extracts. In contrast the highest content of volatile terpenoids (mainly α- and β-pinene) was found in the MAE extracts. All of the tested extracts exhibited relatively high antioxidant activities (especially the UAE extracts) and low MICs against Gram-positive bacteria but were mildly efficient against Gram-negative bacteria. These findings show that the spruce bark might be an important source of bioactive compounds that can be easily extracted from these industrial secondary products. Various uses of this vegetal material may emerge, due to its antioxidant and antibacterial effects.

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Section: Resultscontrasting

confidence: 81%

Phytochemical Profile and Biological Effects of Spruce (Picea abies) Bark Subjected to Ultrasound Assisted and Microwave-Assisted Extractions

Nișca

Ștefănescu

Stegăruş

et al. 2021

Plants

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“…The particle size of the matrix also has an important impact on the overall extraction efficiency. The particle size of spruce bark in the range 1–1.4 mm, as used for the experiment, was determined based on our previous research [23,35]. The obtained results have shown that, to achieve a higher yield, particle size should be greater than 0.3 mm and smaller than 2 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The isolation method can provide a simple way to separate the desired extractives from components of the matrix while keeping the original matrix usable for ultimate energy production. Based on the literature survey, the following extraction methods have been investigated for phytochemicals: Solvent extraction ultrasound-assisted extraction (UAE) [18,19], supercritical fluid extraction (SFE) [20,21], microwave-assisted extraction (MAE) [22,23], accelerated solvent extraction (ASE) [24], and subcritical water extraction (SWE) [25,26].…”

Section: Introductionmentioning

confidence: 99%

Spruce Bark—A Source of Polyphenolic Compounds: Optimizing the Operating Conditions of Supercritical Carbon Dioxide Extraction

et al. 2019

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The present study described the optimization of the extraction process with carbon dioxide in supercritical state for obtaining extractives, especially polyphenols from softwood bark, Norway spruce (Picea abies (L.) Karst.). Using a full 23 factorial design of experiments, the effect of varying the working parameters on the yield of extractives was studied for the following ranges: temperature 40–100 °C, pressure 1050–9000 psi (7.2–62 MPa), and concentration of EtOH/water co-solvent mixture 40–96.6%. In addition, total phenolics content and the antioxidant capacity of the spruce bark extract were determined. The optimum operating conditions for the yield of extractives were identified as 73 °C, 6465 psi (44.5 MPa), and 58% EtOH/water cosolvent concentration for a yield of 8.92%. The optimum conditions for achieving a total phenolics content of 13.89 mg gallic acid equivalent (GAE)/g dry extract were determined as: 45 °C, 1050 psi (7.2 MPa), and 96.6% EtOH/water mixture.

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“…These wastes consist of stems of the crop plants like wheat, rice, sugarcane, etc. [3]. Some statistics presented by different authors show that there are large amounts of wastes generated from agro-forestry sector: 709 million tonnes of wheat straw, 673 million tonnes of rice straw, 102 million tonnes of bagasse [4], 0.1 million tonnes of coir [5], and 2.96 million tonnes of solid olive waste [6].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Natural Antioxidants from Agro-Industrial Side Streams through Advanced Extraction Techniques

et al. 2019

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Large amounts of agro-industrial waste are being generated each year, leading to pollution and economic loss. At the same time, these side streams are rich source of active compounds including antioxidants. Recovered compounds can be re-utilized as food additives, functional foods, nutra-/pharmaceuticals, cosmeceuticals, beauty products, and bio-packaging. Advanced extraction techniques are promising tools to recover target compounds such as antioxidants from agro-industrial side streams. Due to the disadvantages of classical extraction techniques (such as large amounts of solvents, increased time of extraction, large amounts of remaining waste after the extraction procedure, etc.), and advanced techniques emerged, in order to obtain more efficient and sustainable processes. In this review paper aspects regarding different modern extraction techniques related to recovery of antioxidant compounds from wastes generated in different industries and their applications are briefly discussed.

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Yield of Polyphenolic Substances Extracted From Spruce (Picea abies) Bark by Microwave-Assisted Extraction

Cited by 12 publications

References 28 publications

Phytochemical Profile and Biological Effects of Spruce (Picea abies) Bark Subjected to Ultrasound Assisted and Microwave-Assisted Extractions

Phytochemical Profile and Biological Effects of Spruce (Picea abies) Bark Subjected to Ultrasound Assisted and Microwave-Assisted Extractions

Spruce Bark—A Source of Polyphenolic Compounds: Optimizing the Operating Conditions of Supercritical Carbon Dioxide Extraction

Recovery of Natural Antioxidants from Agro-Industrial Side Streams through Advanced Extraction Techniques

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