Maximisation of the polyphenols extraction yield from green tea leaves and sequential clarification

Bindes, Marlon Menezes Maciel; Cardoso, Vicelma Luiz; Reis, Miria Hespanhol Miranda; Boffito, Daria C.

doi:10.1016/j.jfoodeng.2018.08.006

Cited by 47 publications

(32 citation statements)

References 35 publications

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“…As it can be observed in Figure 1, testing the behavior for 120 min, the most polyphenols were obtained at 50 °C after 90 min. This is in line with previous research stating that polyphenols derive at 70 °C and after 1 h. (Bindes et al, 2019). When the extraction is only 60 min a higher temperature can be used, despite the percentage of polyphenols extracted is considerable lower than for 90 minutes.…”

Section: Polyphenolssupporting

confidence: 92%

Optimization of tea extracts composition to dye cotton. Time and temperature influence

Lambrecht

Gisbert-Payá

Bou-Belda

et al. 2020

J APPL RES TECH ENG

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<div data-canvas-width="583.1287199999997">The last few years natural dyes rose in value. Some synthetics dyes are proven to be environmentally harmful and can cause negative effects. Due to the eco awareness the natural dyes were again wildly used. Tea extracts from the Camellia sinensis plant were used. Tea has a large range of phytoconstituents and some can be transferred onto the cotton fabric. The optimal time and temperature to obtain as many phytoconstituents as possible had to be established. The aim of this study was to optimize the extraction process from tea so as to apply the maximum concentration of phytoconstituents onto the textile fibers and improve the cotton functionalization (Ultra violet protection for example) once it is dyed with the extract. Results demonstrate time and temperature had a great influence on the optimization of the tea extracts. We could conclude that after 2 hours the most polyphenols, hydrolysable tannins and condensed tannins are obtained and increasing the time didn’t add any value. The temperature was a really important factor because the polyphenols derived around 70 °C so both the extraction temperature and dyeing treatment should be below 70 °C. Wastewater were characterized in order to determine the phytoconstituents were in the cotton fibres.</div>

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Section: Polyphenolssupporting

confidence: 92%

Optimization of tea extracts composition to dye cotton. Time and temperature influence

Lambrecht

Gisbert-Payá

Bou-Belda

et al. 2020

J APPL RES TECH ENG

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“…Although the extraction yield increased by increasing the L/S ratio (at 70 °C the concentration of polyphenols expressed as mg GAE/g OMWS was 11.8 for a L/S ratio of 5 mL/g and 21.2 for a L/S ratio of 20 mL/g, respectively), an L/S ratio of 5 mL/g was selected in order to reduce the volume of water needed for the extraction. Indeed, the volume of required solvent determines the size of the extraction unit; a lower volume of solvent is preferable because not only less water is needed for the extraction but also less energy is required for heating it up [36].…”

Section: Resultsmentioning

confidence: 99%

A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

2019

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Polyamide commercial membranes in flat-sheet configuration and with molecular weight cut-off (MWCO) in the range of ultrafiltration (UF) to nanofiltration (NF) were tested for the recovery of phenolic compounds from clarified olive mill solid waste (OMSW) aqueous extracts. The performance of selected membranes was evaluated in terms of productivity (permeate flux) and selectivity towards biologically active compounds (such as phenolic compounds, flavanols, and hydroxycinnamic acids derivatives) and total antioxidant activity (TAA) as a function of transmembrane pressure (TMP). NF membranes produced higher permeate fluxes and a lower fouling index in comparison with UF membranes. Retention of bioactive compounds was also significantly higher for NF membranes than for UF membranes. In particular, membranes with MWCO in the range 150–500 Da showed rejection towards flavanols and hydroxycinnamic acid derivatives of about 100%. On the other hand, the rejection towards TAA and total polyphenols was of about 90% and 72%, respectively. Therefore, NF retentate fractions appear of practical interest for the production of food additives and food supplements due to their high antioxidant activity.

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“…The separation of components depends on the polarity of both solvent and component. For plant materials, 100% recovery of individual components might be not achieved since a single solvent may not be selective for a single compound (BINDES et al, 2019). The phenolic compounds in the extract are linked with other biomolecules (e.g., proteins, polysaccharides, terpenes, chlorophyll, lipids and inorganic compounds).…”

Section: Extraction Yieldmentioning

confidence: 99%

Antioxidant potential of various solvent extract from Morus alba fruits and its major polyphenols composition

et al. 2020

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Extraction conditions are an important factor in the process of obtaining bioactive compounds from plant matrix. These compounds differ structurally. Structures of phyto-compounds and their interactions with other food ingredient are not fully known, while these two aspects should play a significant role in extrahents choice and determination of extraction process conditions. Mulberry (Morus alba) is a plant growing in Asia, which fruits are rich in bioactive ingredients and high anti-oxidative potential. In our study we analyzed mulberry fruits extracts differing in the extra hent applied: acetone, methanol, ethanol and water. All tested extracts possessed rich polyphenolic composition and radical scavenging ability. The significant differences among the extracts in phenolic acids and flavonoids compositions were noticed, where the highest values were observed for acetone extract. The extrahent applied affects the antioxidative profile of tested samples, as well. The highest scavenging activity against ABTS was observed for acetone and ethanol extracts, while the poorest activity had water extract. Similar results were provided for ferrous ion reducing test and Fe chlating activity (acetone>ethanol>methanol>water). These results are helpful when selecting solvents with appropriate bioactive compounds compositions and high phytochemical profiles to be used as ingredients in supplements, as well as in functional foods.

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Maximisation of the polyphenols extraction yield from green tea leaves and sequential clarification

Cited by 47 publications

References 35 publications

Optimization of tea extracts composition to dye cotton. Time and temperature influence

Optimization of tea extracts composition to dye cotton. Time and temperature influence

A Combination of Aqueous Extraction and Polymeric Membranes as a Sustainable Process for the Recovery of Polyphenols from Olive Mill Solid Wastes

Antioxidant potential of various solvent extract from Morus alba fruits and its major polyphenols composition

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