Recycling of filter tea industry by-products: Application of subcritical water extraction for recovery of bioactive compounds from A. uva-ursi herbal dust

Naffati, Abdulhakim; Vladić, Jelena; Pavlić, Branimir; Radosavljević, R.; Gavarić, Aleksandra; Vidović, Senka

doi:10.1016/j.supflu.2016.11.010

Cited by 42 publications

(14 citation statements)

References 39 publications

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“…It was observed that a temperature increase from 120 to 170 • C provides a higher yield of phenols extracted from A. uva-ursi herbal dust. Furthermore, higher temperatures led to a drop in the content of phenols [27]. The same findings were recorded by Singh and Saldana [28], who discovered that a higher yield of phenolics was extracted from potato peel at temperatures ranging from 140 to 180 • C. A further rise in temperature up to 240 • C affected the efficiency of the extraction and produced a lower yield of phenols [28].…”

Section: Resultssupporting

confidence: 66%

“…Moreover, a negligible impact of extraction time had been noted in the extraction of S. montana [20]. Temperature causes the disruption of material, however, increasing the temperature above the optimal values could cause degradation of bioactive constituents [27]. Previous studied report that HCl can have a highly important positive or negative impact on the extraction of TPH [27,38,39].…”

Section: Determination Of Total Flavonoids Contentmentioning

confidence: 99%

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Valorization of Yarrow (Achillea millefolium L.) By-Product through Application of Subcritical Water Extraction

et al. 2020

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In the present study, valorization of yarrow (Achillea millefolium) by-product from the filter tea industry was investigated through the application of subcritical water for the extraction of bioactive compounds. The influence of different process parameters (temperature 120–200 °C, extraction time 10–30 min, and HCl concentration in extraction solvent 0–1.5%) on extract quality in terms of content of bioactive compounds and antioxidant activity was investigated. Optimal conditions of the extraction process (temperature 198 °C, extraction time 16.5 min, and without acidifer) were determined and, when applied, the most efficient exploitation of by-products is achieved, that is, attainment of extracts rich in total phenols and flavonoids and high antioxidant activity. In addition, by applying the high performance liquid chromatographic analysis, the content of chlorogenic acid was determined as well as the hydroxymethylfurfural content in obtained extracts. The results demonstrated that subcritical water can be successfully used for utilization of yarrow by-products for obtaining extracts rich in antioxidants.

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Section: Resultssupporting

confidence: 66%

Section: Determination Of Total Flavonoids Contentmentioning

confidence: 99%

Valorization of Yarrow (Achillea millefolium L.) By-Product through Application of Subcritical Water Extraction

et al. 2020

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“…The main purpose of this study was to estimate the efficiency of spray drying technology to microencapsulate phenolic compounds from horehound subcritical extract obtained at optimal conditions of process parameters. This extract, used as liquid feed, was obtained through subcritical water extraction which has been acknowledged as a powerful extraction technology to recover phenolic compounds from different matrices [15,16]. The obtained powders were further investigated with reference to their physical and chemical properties.…”

Section: Introductionmentioning

confidence: 99%

Spray Drying of a Subcritical Extract Using Marrubium vulgare as a Method of Choice for Obtaining High Quality Powder

et al. 2019

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White horehound (Marrubium vulgare L.), is a grey-leaved perennial herb, belonging to Lamiaceae family, distributed in Eurasia and northern Africa. Despite the fact that M. vulgare has been used since ancient times in treating diverse diseases, it is only in the last decade or so that scientists have been able to lay the foundation for its potential pharmacological actions from the results observed through the prism of ethnopharmacological use of this species. The novelty of this study was that subcritical water extraction, acknowledged as a powerful extraction technology to recover phenolic compounds, was coupled with spray drying. The subcritical horehound extract, obtained using optimal process parameters, was used as a liquid feed in spray drying. Maltodextrin was used as a carrier in a concentration of 10%. Thus, two M. vulgare powders, carrier-free and 10% MD, were produced. Comprehensive powders characterization was conducted in order to evaluate their quality. Results confirmed that spray drying can be used as a method of choice for obtaining high quality horehound powders which kept the amorphous structure constant after 6 months.

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“…Water at subcritical conditions has been used as a solvent in natural extraction [1][2][3], the recovery of useful materials from organic wastes [4,5], depolymerization [6,7], chemical reactions [8,9] and organic synthesis [10][11][12] due to its high ion product. Supercritical water conditions can be applied for the complete oxidation of organic waste [13,14].…”

Section: Introductionmentioning

confidence: 99%

Catalytic effect of different reactor materials under subcritical water conditions: decarboxylation of cysteic acid into taurine

Faisal

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In order to understand the influence of reactor materials on the catalytic effect for a particular reaction, the decomposition of cysteic acid from Ni/Fe-based alloy reactors under subcritical water conditions was examined. Experiments were carried out in three batch reactors made of Inconel 625, Hastelloy C-22 and SUS 316 over temperatures of 200 to 300 ℃. The highest amount of eluted metals was found for SUS 316. The results demonstrated that reactor materials contribute to the resulting product. Under the tested conditions, cysteic acid decomposes readily with SUS 316. However, the Ni-based materials (Inconel 625 and Hastelloy C-22) show better resistance to metal elution. It was found that among the materials used in this work, SUS 316 gave the highest reaction rate constant of 0.1934 s−1. The same results were obtained at temperatures of 260 and 300 ℃. Investigation of the Arrhenius activation energy revealed that the highest activation energy was for Hastelloy C-22 (109 kJ/mol), followed by Inconel 625 (90 kJ/mol) and SUS 316 (70 kJ/mol). The decomposition rate of cysteic acid was found to follow the results for the trend of the eluted metals. Therefore, it can be concluded that the decomposition of cysteic acid was catalyzed by the elution of heavy metals from the surface of the reactor. The highest amount of taurine from the decarboxylation of cysteic acid was obtained from SUS 316.

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Recycling of filter tea industry by-products: Application of subcritical water extraction for recovery of bioactive compounds from A. uva-ursi herbal dust

Cited by 42 publications

References 39 publications

Valorization of Yarrow (Achillea millefolium L.) By-Product through Application of Subcritical Water Extraction

Valorization of Yarrow (Achillea millefolium L.) By-Product through Application of Subcritical Water Extraction

Spray Drying of a Subcritical Extract Using Marrubium vulgare as a Method of Choice for Obtaining High Quality Powder

Catalytic effect of different reactor materials under subcritical water conditions: decarboxylation of cysteic acid into taurine

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