Scaling up continuous ultrasound-assisted extractor for plant extracts by using spinach leaves as a test material

Tamminen, Jussi; Holappa, Janne; Gradov, Dmitry Vladimirovich; Koiranen, Tuomas

doi:10.1016/j.ultsonch.2022.106171

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…The ultrasound-assisted peeling process has advantages of shortening the reaction time, at a relatively low temperature, with a relatively simple flowsheet, which is easy to be controlled and amplified, and with potential scale-up value. , However, ultrasonic power needs to be controlled within a reasonable range; otherwise, it will reduce the stripping efficiency of the cathode active substance. As the ultrasonic time and power increase, the removal efficiency also increases.…”

Section: Discussionmentioning

confidence: 99%

Review of Ultrasound-Assisted Recycling and Utilization of Cathode Materials from Spent Lithium-Ion Batteries: State-of-the-Art and Outlook

Tong,

Ren,

et al. 2023

Energy Fuels

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The recycling of spent lithium-ion batteries can not only reduce the potential harm caused by solid waste piles to the local environment but also provide raw materials for manufacturing new batteries. Power ultrasound is one of the effective means to enhance the resourceful recycling of spent lithium-ion batteries, and the unique physical and chemical effects are the main mechanisms that lead to the enhancement. A large number of studies reported the recycling and utilization of cathode materials from spent lithium-ion batteries with the assistance of ultrasound. In this paper, first, we discuss the pathway of ultrasonic enhancement of the resource-based recycling of spent lithium-ion batteries regarding the introduction of ultrasonic cavitation theories; second, we systematically review the research of ultrasonic applications in the separation of metal collectors from, the recovery of, and the regeneration of cathode materials of spent lithium-ion batteries; finally, shortcomings of the ultrasound-assisted technology in industrial applications are discussed, and prospects of industrial ultrasonic applications in the resource recycling and utilization of spent lithium-ion batteries are proposed.

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Section: Discussionmentioning

confidence: 99%

Review of Ultrasound-Assisted Recycling and Utilization of Cathode Materials from Spent Lithium-Ion Batteries: State-of-the-Art and Outlook

Tong,

Ren,

et al. 2023

Energy Fuels

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“…UAE is an environmentally friendly extraction technique that uses less energy and solvent, requires less time and money for extraction, and yields a greater product recovery rate than traditional techniques. 32 Tamminen et al 33 highlighted that scaling up the sonochemical process to continuous or large-scale operations is a critical barrier for industrializing the UAE technology. However, there have been few published reports of industrial or experimental processing plants in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Tamminen et al highlighted that scaling up the sonochemical process to continuous or large-scale operations is a critical barrier for industrializing the UAE technology. However, there have been few published reports of industrial or experimental processing plants in the literature. − …”

Section: Introductionmentioning

confidence: 99%

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Sequential Extraction and Characterization of Essential Oil, Flavonoids, and Pectin from Industrial Orange Waste

Dikmetas,

Devecioglu,

Karbancioglu-Guler

et al. 2024

ACS Omega

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Orange is one of the primary fruits processed into juice and other products worldwide, leading to a vast amount of waste accumulation. Such waste has been considered as an attractive candidate for upcycling to obtain bioactive components remaining. The present study investigated the extraction of essential oil (EO), flavonoids, and pectin from industrial orange waste with a holistic approach. To maximize EO yield and Dlimonene concentration, hydrodistillation (HD) conditions were selected to be 5.5 mL water/g solid for 180 min. Remaining solids were further used for flavonoid extraction where conventional solvent, sequential ultrasound + solvent, and ultrasound-assisted extraction (UE) were applied. UE applied for 50 min with 120 mL solvent/g solid yielded the highest total phenolic (TPCs) and total flavonoid contents (TFCs), antioxidant capacity, and hesperidin and neohesperidin concentrations. In terms of TPC, TFC, antioxidant capacity, and antibacterial activity, both EO and flavonoid fractions demonstrated moderate to high bioactivity. At the final step, ethanol precipitation was applied to obtain the pectin that was solubilized in hot water during HD and it was characterized by Fourier transform infrared, degree of esterification, and galacturonic acid content. Practical application: to ensure utilization in the food, pharmaceutical, and cosmetic industries, this study presents a combined method to obtain several value-added compounds from industrial orange waste. Bioactive EO and flavonoids obtained could have applications in functional food, supplements, or cosmetic formulations, whereas extracted pectin can be used in many formulated foods and drugs.

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Optimizing catechin extraction from green tea waste: Comparative analysis of hot water, ultrasound‐assisted, and ethanol methods for enhanced antioxidant recovery

Athirojthanakij,

Rashidinejad

2024

Food Science & Nutrition

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This study aimed to develop an efficient method for the extraction of bioactive compounds from green tea waste (GTW) toward its potential application in the food industry. GTW, which is generated during the harvesting and processing of green tea products, accounts for a global annual loss of nearly 1 million tonnes. Notably, this waste is rich in polyphenolic compounds, particularly catechins, which are renowned for their significant health benefits. We assessed the optimization of catechin extraction from GTW employing hot water extraction (HWE), ultrasound‐assisted extraction (UAE), and ethanol extraction (EthE) techniques at different sample‐to‐solvent ratios (1:100, 1:50, and 1:20 w/v). The extraction temperature was set at 80°C for both HWE and UAE; however, for EthE, the temperature was slightly lower at 70°C, adhering to the boiling point of ethanol. High‐performance liquid chromatography was used to determine the extraction efficiency by quantifying various catechins (i.e., catechin, epicatechin [EC], epicatechin gallate [ECG], epigallocatechin [EGC], and epigallocatechin gallate [EGCG]). In terms of the concentration for individual catechins, EC was found to be the highest concentration detected, ranging from 30.58 ± 1.17 to 37.95 ± 0.84 mg/L in all extraction techniques and ratios of solvents, followed by EGCG (9.71 ± 1.40–20.99 ± 1.11 mg/L), EGC + C (7.95 ± 0.66–12.58 ± 0.56 mg/L), and ECG (1.85 ± 0.71–6.05 ± 0.06 mg/L). The findings of DPPH (2,2‐diphenyl‐1‐picryl‐hydrazyl) free radical assay illustrated that HWE demonstrated the highest extraction efficiency at all ratios, ranging from 61.41 ± 1.00 to 70.36 ± 1.47 mg/L. The 1:50 ratio exhibited the highest extraction yield (25.98% ± 0.75%) compared to UAE (24.16% ± 0.95%) and EthE (22.59% ± 0.26%). Moreover, this method of extraction (i.e., HWE) produced the highest total catechins and %DPPH reduction. Consequently, HWE was the most efficient method for extracting catechins from GTW, underscoring its potential for valorizing waste within the food manufacturing industry.

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Scaling up continuous ultrasound-assisted extractor for plant extracts by using spinach leaves as a test material

Cited by 7 publications

References 31 publications

Review of Ultrasound-Assisted Recycling and Utilization of Cathode Materials from Spent Lithium-Ion Batteries: State-of-the-Art and Outlook

Review of Ultrasound-Assisted Recycling and Utilization of Cathode Materials from Spent Lithium-Ion Batteries: State-of-the-Art and Outlook

Sequential Extraction and Characterization of Essential Oil, Flavonoids, and Pectin from Industrial Orange Waste

Optimizing catechin extraction from green tea waste: Comparative analysis of hot water, ultrasound‐assisted, and ethanol methods for enhanced antioxidant recovery

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