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Dikmetas D, Devecioglu D, Karbancioglu-Guler F, Kahveci D. Sequential Extraction and Characterization of Essential Oil, Flavonoids, and Pectin from Industrial Orange Waste. ACS OMEGA 2024; 9:14442-14454. [PMID: 38559951 PMCID: PMC10976415 DOI: 10.1021/acsomega.4c00112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 02/28/2024] [Accepted: 03/05/2024] [Indexed: 04/04/2024]
Abstract
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 d-limonene 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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Affiliation(s)
- Dilara
Nur Dikmetas
- Faculty of Chemical and Metallurgical
Engineering, Department of Food Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
| | - Dilara Devecioglu
- Faculty of Chemical and Metallurgical
Engineering, Department of Food Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
| | - Funda Karbancioglu-Guler
- Faculty of Chemical and Metallurgical
Engineering, Department of Food Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
| | - Derya Kahveci
- Faculty of Chemical and Metallurgical
Engineering, Department of Food Engineering, Istanbul Technical University, Maslak 34469, Istanbul, Turkey
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2
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Yang N, Jin Y. Novel Electromagnetic Heat Hydrodistillation for Extraction of Essential Oil from Tangerine Peel. Foods 2024; 13:677. [PMID: 38472790 DOI: 10.3390/foods13050677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024] Open
Abstract
A novel electromagnetic heat method is presented for green extraction of natural compounds from peel residue. In the processing cavity obtained through 3D printing, a core made of amorphous alloy was applied to strengthen the magnetic flux. During the process, an induced electric field was produced in the extract medium owing to an oscillating magnetic field at 50 kHz rather than a pair of electrodes; thus, electrochemical reactions could be avoided. A thermal effect and temperature rise were observed under the field, and essential oil was obtained via this electromagnetic heat hydrodistillation. In addition, the numerical relationships between magnetic field, induced electric field (IEF), induced current density, and temperature profile were elaborated; they were positively correlated with the extraction yield of essential oils. It was found that the waveforms of the magnetic field, induced electric field, and excitation voltage were not consistent. Using a higher magnetic field resulted in high current densities and terminal temperatures in the extracts, as well as higher essential oil yields. When the magnetic field strength was 1.39 T and the extraction time was 60 min, the maximum yield of essential oil reached 1.88%. Meanwhile, conventional hydrodistillation and ohmic heating hydrodistillation were conducted for the comparison; all treatments had no significant impact on the densities. In addition, the essential oil extracted by electromagnetic heat had the lowest acid value and highest saponification value. The proportion of monoterpenoids and oxygen-containing compounds of essential oil extracted by this proposed method was higher than the other two methods. In the end, the development of this electromagnetic heat originating from magnetic energy has the potential to recover high-value compounds from biomass waste.
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Affiliation(s)
- Na Yang
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
| | - Yamei Jin
- State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
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Zhang J, Zhang M, Ju R, Chen K, Bhandari B, Wang H. Advances in efficient extraction of essential oils from spices and its application in food industry: A critical review. Crit Rev Food Sci Nutr 2023; 63:11482-11503. [PMID: 35766478 DOI: 10.1080/10408398.2022.2092834] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
With the increase of people's awareness of food safety, it is crucial to find natural and green antimicrobial agents to replace traditional antimicrobial agents. Essential oils of spices (SEOs) are low toxicity or nontoxic, which exhibited antioxidants and antimicrobial activity according to many in vitro and in situ experiments. Spices are widely available and low cost as a plant raw material for the extraction of SEOs. This review summarized highly efficient extraction techniques for SEOs, such as physical field assisted extraction technology, supercritical fluid extraction, and biological-based techniques. Furthermore, purification of SEOs and components were also recapitulated. Purification techniques of SEOs improve their utilization value due to the increased content of bioactive components. Finally, the review concentrated on the applications of SEOs in food industry, including food preservation, food active packaging by means of films or coatings, antioxidant properties. In addition, addressing the problem of unstability of SEOs and its role to inhibit the pathogenic bacteria, the encapsulation of SEOs for use in the food industrial sectors reduces the safety risk to human health.
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Affiliation(s)
- Jiong Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
- Jiangsu Province International Joint Laboratory on Fresh Food Smart Processing and Quality Monitoring, Jiangnan University, Wuxi, Jiangsu, China
| | - Min Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
- International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, Jiangsu, China
| | - Ronghua Ju
- Agricultural and Forestry Products Deep Processing Technology and Equipment Engineering Center of Jiangsu Province, Nanjing Forestry University, Nanjing, Jiangsu, China
| | - Kai Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Bhesh Bhandari
- School of Agriculture and Food Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Haixiang Wang
- Yechun Food Production and Distribution Co., Ltd., Yangzhou, Jiangsu, China
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Martínez-Zamora L, Cano-Lamadrid M, Artés-Hernández F, Castillejo N. Flavonoid Extracts from Lemon By-Products as a Functional Ingredient for New Foods: A Systematic Review. Foods 2023; 12:3687. [PMID: 37835340 PMCID: PMC10573073 DOI: 10.3390/foods12193687] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 09/29/2023] [Accepted: 10/06/2023] [Indexed: 10/15/2023] Open
Abstract
This systematic review seeks to highlight, from the published literature about the extraction and application of lemon by-products rich in flavonoids, which works use environmentally friendly technologies and solvents and which ones propose a potentially functional food application, according to the Sustainable Development Goals (SDGs). WoS and SCOPUS were used as scientific databases for searching the documents, which were evaluated through 10 quality questions according to their adherence to our purpose (5 questions evaluating papers devoted to lemon flavonoid extraction and 5 concerning the application of such by-products in new foods). Each question was evaluated as "Yes", "No", or "does Not refer", according to its adherence to our aim. The analysis reported 39 manuscripts related to lemon flavonoid extraction; 89% of them used green technologies and solvents. On the other hand, 18 manuscripts were related to the incorporation of lemon by-products into new foods, of which 41% adhered to our purpose and only 35% evaluated the functionality of such incorporation. Conclusively, although the bibliography is extensive, there are still some gaps for further investigation concerning the extraction and application of lemon by-products to reduce food losses in an environmentally friendly way and the possible development of new functional foods, which must be performed following the SDGs.
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Affiliation(s)
- Lorena Martínez-Zamora
- Department of Food Technology, Nutrition and Food Science, Faculty of Veterinary Sciences, University of Murcia, 30071 Espinardo, Murcia, Spain
- Postharvest and Refrigeration Group, Department of Agronomical Engineering and Institute of Plant Biotechnology, Universidad Politécnica de Cartagena, 30203 Cartagena, Murcia, Spain; (M.C.-L.); (F.A.-H.)
| | - Marina Cano-Lamadrid
- Postharvest and Refrigeration Group, Department of Agronomical Engineering and Institute of Plant Biotechnology, Universidad Politécnica de Cartagena, 30203 Cartagena, Murcia, Spain; (M.C.-L.); (F.A.-H.)
| | - Francisco Artés-Hernández
- Postharvest and Refrigeration Group, Department of Agronomical Engineering and Institute of Plant Biotechnology, Universidad Politécnica de Cartagena, 30203 Cartagena, Murcia, Spain; (M.C.-L.); (F.A.-H.)
| | - Noelia Castillejo
- Postharvest and Refrigeration Group, Department of Agronomical Engineering and Institute of Plant Biotechnology, Universidad Politécnica de Cartagena, 30203 Cartagena, Murcia, Spain; (M.C.-L.); (F.A.-H.)
- Department of Agricultural Sciences, Food, Natural Resources and Engineering, University of Foggia, Via Napoli 25, I-71122 Foggia, Italy
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Šafranko S, Šubarić D, Jerković I, Jokić S. Citrus By-Products as a Valuable Source of Biologically Active Compounds with Promising Pharmaceutical, Biological and Biomedical Potential. Pharmaceuticals (Basel) 2023; 16:1081. [PMID: 37630996 PMCID: PMC10458533 DOI: 10.3390/ph16081081] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/27/2023] Open
Abstract
Citrus fruits processing results in the generation of huge amounts of citrus by-products, mainly peels, pulp, membranes, and seeds. Although they represent a major concern from both economical and environmental aspects, it is very important to emphasize that these by-products contain a rich source of value-added bioactive compounds with a wide spectrum of applications in the food, cosmetic, and pharmaceutical industries. The primary aim of this review is to highlight the great potential of isolated phytochemicals and extracts of individual citrus by-products with bioactive properties (e.g., antitumor, antimicrobial, antiviral, antidiabetic, antioxidant, and other beneficial activities with health-promoting abilities) and their potential in pharmaceutical, biomedical, and biological applications. This review on citrus by-products contains the following parts: structural and chemical characteristics; the utilization of citrus by-products; bioactivities of the present waxes and carotenoids, essential oils, pectins, and phenolic compounds; and citrus by-product formulations with enhanced biocactivities. A summary of the recent developments in applying citrus by-products for the treatment of different diseases and the protection of human health is also provided, emphasizing innovative methods for bioaccessibility enhancements (e.g., extract/component encapsulation, synthesis of biomass-derived nanoparticles, nanocarriers, or biofilm preparation). Based on the representative phytochemical groups, an evaluation of the recent studies of the past six years (from 2018 to 2023) reporting specific biological and health-promoting activities of citrus-based by-products is also provided. Finally, this review discusses advanced and modern approaches in pharmaceutical/biological formulations and drug delivery (e.g., carbon precursors for the preparation of nanoparticles with promising antimicrobial activity, the production of fluorescent nanoparticles with potential application as antitumor agents, and in cellular imaging). The recent studies implementing nanotechnology in food science and biotechnology could bring about new insights into providing innovative solutions for new pharmaceutical and medical discoveries.
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Affiliation(s)
- Silvija Šafranko
- Faculty of Food Technology Osijek, University of Osijek, Franje Kuhača 18, 31000 Osijek, Croatia; (S.Š.); (D.Š.)
| | - Drago Šubarić
- Faculty of Food Technology Osijek, University of Osijek, Franje Kuhača 18, 31000 Osijek, Croatia; (S.Š.); (D.Š.)
| | - Igor Jerković
- Department of Organic Chemistry, Faculty of Chemistry and Technology, University of Split, Ruđera Boškovića 35, 21000 Split, Croatia
| | - Stela Jokić
- Faculty of Food Technology Osijek, University of Osijek, Franje Kuhača 18, 31000 Osijek, Croatia; (S.Š.); (D.Š.)
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Moradi‐Sadr J, Ebadi M, Ayyari M, Ghomi H. Optimization of ultrasonic Bath and cold plasma pre-treatments in the spearmint essential oil isolation process. Food Sci Nutr 2023; 11:1904-1915. [PMID: 37051368 PMCID: PMC10084965 DOI: 10.1002/fsn3.3224] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 12/08/2022] [Accepted: 12/29/2022] [Indexed: 01/13/2023] Open
Abstract
Spearmint essential oil (SEO), one of the economically valuable natural products, has special importance in the food, pharmaceutical, and perfumery industries due to its antifungal, antioxidant, and enzyme inhibitory properties. In this study, we optimized and evaluated the effect of three pre-treatments on the extraction of SEO for quantity and quality: ultrasonic bath (UB), water to material ratio-ultrasonic bath (W/M-UB), and cold plasma-ultrasonic bath (CP-UB). Three experiments were designed using the central composite design (CCD) of response surface methodology (RSM). Experimental treatments included UB temperature (30-80°C) and time duration (1-30 min), cold plasma (CP) power (15-24 kV), and water/material ratio (10-40). Then, SEOs were extracted by hydro-distillation using the Clevenger apparatus. The results showed that SEO yield in the optimal conditions of treatments was 119.7%, 206.6%, and 155.7% higher in UB, W/M-UB, and CP-UB pretreatments respectively, in comparison to control sample and optimized conditions were UB temperature: 37.3°C and UB time: 5.2 min at UB treatment, 33.9 of W/M ratio, 69.9°C of UB temperature and 6.9 min of UB time at W/M-UB treatment and CP power: 22.176, UB temperature: 40.135 and UB time: 24.122 at CP-UB treatment. Oxygenated monoterpenes were also higher in the essential oils (EOs) of all three treated plant materials. In conclusion, the SEO extraction yield improved by the application of the pretreatments in optimized conditions.
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Affiliation(s)
- Jalil Moradi‐Sadr
- Department of Horticultural SciencesTarbiat Modares UniversityTehranIran
| | | | - Mahdi Ayyari
- Department of Horticultural SciencesTarbiat Modares UniversityTehranIran
| | - Hamidreza Ghomi
- Laser and Plasma Research InstituteShahid Beheshti UniversityTehranIran
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Hamzah MH, Ibrahim SK, Nor MZM, Hamzah AFA, Shamsudin R, Ali AHM. Optimization of electrochemical pre-treatment for essential oil extraction from lemon myrtle (B. citriodora) leaves by response surface methodology. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2023. [DOI: 10.1007/s11694-023-01903-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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8
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Sun R, Niu Y, Li M, Liu Y, Wang K, Gao Z, Wang Z, Yue T, Yuan Y. Emerging trends in pectin functional processing and its fortification for synbiotics: A review. Trends Food Sci Technol 2023. [DOI: 10.1016/j.tifs.2023.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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9
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Ling B, Ramaswamy HS, Lyng JG, Gao J, Wang S. Roles of physical fields in the extraction of pectin from plant food wastes and byproducts: A systematic review. Food Res Int 2023; 164:112343. [PMID: 36737935 DOI: 10.1016/j.foodres.2022.112343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 11/18/2022] [Accepted: 12/23/2022] [Indexed: 12/27/2022]
Abstract
Pectin is a naturally occurring hydrocolloid found in the cell wall and middle lamella of many plants and has numerous functional applications in food and other related industries. The type of extraction methods used in production has a strong influence on the structural or physicochemical properties of the resultant pectin and the potential application or market value of the produced pectin. Many conventional extraction methods are well-established and commercially well adopted. However, the increased demand for pectin due to limitations of the existing methods in terms of efficiency and influence on end product quality has been renewed in developing novel techniques or procedures that help to alleviate these problems. In this review paper, a series of strategies involving the application of physical fields, such as acoustic, electromagnetic, electric and mechanical one, are reviewed for potential opportunities to improve the yield and quality attributes of pectin extracted from plant food wastes and byproducts. The extraction mechanism, processing equipment, key operating parameters as well as advantages and disadvantages of each method are systematically reviewed, and findings and conclusions on the potential applications of each method are described. Moreover, the challenges and future directions of physical field assisted extraction (PFAE) of pectin are also discussed to facilitate a better understanding of the complex mechanism in PFAE and optimizing operational parameters. This review may also provide specific theoretical information and practical applications to improve the design and scale up PFAE of pectin.
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Affiliation(s)
- Bo Ling
- Northwest A&F University, College of Mechanical and Electronic Engineering, Yangling, Shaanxi 712100, China
| | - Hosahalli S Ramaswamy
- Department of Food Science and Agricultural Chemistry, McGill University, Montreal H9X 3V9, Canada.
| | - James G Lyng
- Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Ireland
| | - Jilong Gao
- Northwest A&F University, College of Mechanical and Electronic Engineering, Yangling, Shaanxi 712100, China
| | - Shaojin Wang
- Northwest A&F University, College of Mechanical and Electronic Engineering, Yangling, Shaanxi 712100, China; Department of Biological Systems Engineering, Washington State University, 213 L.J. Smith Hall, Pullman, WA 99164-6120, USA.
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Liu Y, Weng P, Liu Y, Wu Z, Wang L, Liu L. Citrus pectin research advances: Derived as a biomaterial in the construction and applications of micro/nano-delivery systems. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Al-Hilphy AR, Al-Mtury AAA, Al-Shatty SM, Hussain QN, Gavahian M. Ohmic Heating as a By-Product Valorization Platform to Extract Oil from Carp (Cyprinus carpio) Viscera. FOOD BIOPROCESS TECH 2022. [DOI: 10.1007/s11947-022-02897-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Goksu A, OMAC B, Sabancı S. Ohmic Heating: A Futuristic Method for Cooking Bulgur. J FOOD PROCESS PRES 2022. [DOI: 10.1111/jfpp.17025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Ali Goksu
- Faculty of Fine Arts, Department of Gastronomy and Culinary Arts Munzur University Tunceli Turkey
| | - Basri OMAC
- Tunceli Vocational School, Department of Food Processing Munzur University Tunceli Turkey
| | - Serdal Sabancı
- Faculty of Health Sciences, Department of Nutrition and Dietetics Munzur University Tunceli Turkey
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Impact of Cell Disintegration Techniques on Curcumin Recovery. FOOD ENGINEERING REVIEWS 2022. [DOI: 10.1007/s12393-022-09319-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Abstract
In recent years, the improvement of curcumin recovery from turmeric by cell and tissue disintegration techniques has been gaining more attention; these emerging techniques were used for a reproducible and robust curcumin extraction process. Additionally, understanding the material characteristics is also needed to choose the optimized technique and appropriate processing parameters. In this review, an outlook about the distribution of different fractions in turmeric rhizomes is reviewed to explain matrix challenges on curcumin extraction. Moreover, the most important part, this review provides a comprehensive summary of the latest studies on ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE), enzyme-assisted extraction (EAE), high-pressure-assisted extraction (HPAE), pulsed electric field-assisted extraction (PEFAE), and ohmic heating-assisted extraction (OHAE). Lastly, a detailed discussion about the advantages and disadvantages of emerging techniques will provide an all-inclusive understanding of the food industry’s potential of different available processes.
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Gavahian M, Yang YH, Tsai PJ. Power ultrasound for valorization of Citrus limon (cv. Eureka) waste: Effects of maturity stage and drying method on bioactive compounds, antioxidant, and anti-diabetic activity. INNOV FOOD SCI EMERG 2022. [DOI: 10.1016/j.ifset.2022.103052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Toprakçı G, Toprakçı İ, Şahin S. Highly clean recovery of natural antioxidants from lemon peels: Lactic acid-based automatic solvent extraction. PHYTOCHEMICAL ANALYSIS : PCA 2022; 33:554-563. [PMID: 35112419 DOI: 10.1002/pca.3109] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 06/14/2023]
Abstract
INTRODUCTION Food industry generates large amounts of waste by-products rich in natural antioxidants. On the other hand, application of advanced processes for the recovery of these fine chemicals is another popular topic of recent years. OBJECTIVE The purpose of this study is to propose a green extraction method by application of deep eutectic solvent-based automated solvent extraction (AMSE) from lemon peels. METHODS The primary polyphenols (hesperidin, naringin, and p-coumaric acid) and the total polyphenols of the lemon peel extract were quantified and used as response for the optimisation of the AMSE conditions. The Box-Behnken design type of the response surface method (RSM) was chosen for optimisation study. Scavenging activity of the lemon peel extract against 2,2-diphenyl-1-picrylhydrazil (DPPH) free radical was also measured in vitro. RESULTS The optimum conditions for the highest total phenolic (7.47 mg-gallic acid equivalent [GAE]/g-lemon peel [LP]), naringin (5.05 mg/g-LP), p-coumaric acid (3.27 mg/g-LP), and hesperidin (0.07 mg/g-LP) yields were obtained by 1.5 h of extraction time, 46% water (v/v), and 5 g of peel. The antioxidant activity changed between 37.31% and 94.10% in the peels. CONCLUSIONS Extraction time was the most effective process factor for the total phenolic and p-coumaric acid yields, while water addition was statistically very important (p < 0.0001) for the naringin and hesperidin yields in the current AMSE system. The second-order models generated for the selected systems represent the data satisfyingly based on the high coefficients of determination (> 0.99), statistically significant p-values (<0.0001), coefficient of variation values (< 10%), and non-significant lack-of-fit values (p > 0.05).
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Affiliation(s)
- Gizem Toprakçı
- Chemical Engineering Department, Istanbul University-Cerrahpaşa, Istanbul, Turkey
| | - İrem Toprakçı
- Chemical Engineering Department, Istanbul University-Cerrahpaşa, Istanbul, Turkey
| | - Selin Şahin
- Chemical Engineering Department, Istanbul University-Cerrahpaşa, Istanbul, Turkey
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