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Mabasso GA, Cabral JCO, Barbosa KF, Resende O, de Oliveira DEC, de Almeida AB. Drying kinetics, thermodynamic properties and physicochemical characteristics of Rue leaves. Sci Rep 2024; 14:14526. [PMID: 38914559 PMCID: PMC11196716 DOI: 10.1038/s41598-024-64418-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Accepted: 06/09/2024] [Indexed: 06/26/2024] Open
Abstract
Generally, medicinal plants are harvested with high amount of water, so it is essential to subject the product to drying as soon as possible to prevent degradation before application. Most compounds from medicinal plants are sensitive to drying processes, so it is important to adjust the drying conditions. The objective of this study was to describe the drying of Rue (Ruta chalepensis L.) leaves, select the models that best fit each drying condition, determine the activation energy and thermodynamic properties of the leaves, and evaluate their quality after drying. Leaves were harvested with moisture content of 3.55 ± 0.05 kg water kg-1dry matter and subjected to drying at temperatures of 40, 50, 60 and 70 °C. Valcam model showed the best fit to represent the drying kinetics of Rue leaves at temperatures of 40 and 70 °C, and Midilli model proved to be better for the temperatures of 50 and 60 °C. Effective diffusion coefficient increased linearly with the increase in drying air temperature, and the activation energy was 60.58 kJ mol-1. Enthalpy, entropy and Gibbs free energy values ranged from 57.973 to 57.723 kJ mol-1, from - 0.28538 to - 0.28614 kJ mol-1 K-1 and from 147.34 to 155.91 kJ mol-1, respectively, for the temperature range of 40-70 °C. Drying air temperature promoted darkening or tendency to loss of green color; increase in drying air temperature leads to greater discoloration, as well as a higher concentration of total phenolic compounds (about 221.10 mg GAE mL-1 g-1 dm), with a peak at temperature of 60 °C.
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Affiliation(s)
- Geraldo Acácio Mabasso
- Federal Institute of Education, Science and Technology Goiano - Rio Verde Campus, Sul Goiana Street, Km 1, Zona Rural, Rio Verde, Goiás, Brazil.
- Faculty of Environmental Engineering and Natural Resources, Zambeze University, 7 de Abril Neighborhood, Regional Street 535, Km 5, Chimoio, Manica, Mozambique.
| | - Jennifer Cristhine Oliveira Cabral
- Federal Institute of Education, Science and Technology Goiano - Rio Verde Campus, Sul Goiana Street, Km 1, Zona Rural, Rio Verde, Goiás, Brazil
| | - Karine Feliciano Barbosa
- Federal Institute of Education, Science and Technology Goiano - Rio Verde Campus, Sul Goiana Street, Km 1, Zona Rural, Rio Verde, Goiás, Brazil
| | - Osvaldo Resende
- Federal Institute of Education, Science and Technology Goiano - Rio Verde Campus, Sul Goiana Street, Km 1, Zona Rural, Rio Verde, Goiás, Brazil
| | - Daniel Emanuel Cabral de Oliveira
- Federal Institute of Education, Science and Technology Goiano - Rio Verde Campus, Sul Goiana Street, Km 1, Zona Rural, Rio Verde, Goiás, Brazil
| | - Adrielle Borges de Almeida
- Federal Institute of Education, Science and Technology Goiano - Rio Verde Campus, Sul Goiana Street, Km 1, Zona Rural, Rio Verde, Goiás, Brazil
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Kwaśnica A, Pachura N, Carbonell-Barrachina ÁA, Issa-Issa H, Szumny D, Figiel A, Masztalerz K, Klemens M, Szumny A. Effect of Drying Methods on Chemical and Sensory Properties of Cannabis sativa Leaves. Molecules 2023; 28:8089. [PMID: 38138578 PMCID: PMC10745367 DOI: 10.3390/molecules28248089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 12/24/2023] Open
Abstract
Hemp is used as a source of fiber, oil and bioactive substances including volatile and cannabinoid-containing substances. This paper presents, for the first time, results on the evaluation of drying methods (convective, vacuum-microwave and combined convective pre-drying and vacuum-microwave finishing drying) of hemp leaves on the qualitative and quantitative changes in secondary metabolites, including essential oils, cannabinoids and sterols. A ranking and descriptive test of hemp leaves was also performed. Drying kinetics was presented using three models, including logarithmic, Midilli and modified Page. The SPME-Arrow technique was used to determine 41 volatile compounds, of which caryophyllene, β-myrcene and α-humulene were dominant in dried and fresh leaves. Regarding the essential oils obtained, 64 were identified, with caryophyllene, humulene epoxide II and limonene being the dominant ones. For preserving the highest amount of oils, the best method was the convective pre-drying followed by vacuum-microwave finishing drying (CD60-VMD) combined method, where the retention of volatile compounds was 36.08%, whereas the CD70 and 240-VMD methods resulted in the highest loss of 83%. The predominant cannabinoids in fresh hemp leaves were CBDA 6.05 and CBD 2.19 mg g-1. Drying caused no change in the cannabinoid profile of the plant material. β-Sitosterol, campesterol and lupeol were dominant in the phytosterol and triterpene fractions. No changes in either quality or quantity were observed in any of the variants found.
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Affiliation(s)
- Andrzej Kwaśnica
- Department of Food Chemistry and Biocatalysis, Wroclaw University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland (A.S.)
| | - Natalia Pachura
- Department of Food Chemistry and Biocatalysis, Wroclaw University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland (A.S.)
| | | | - Hanán Issa-Issa
- Departamento Tecnología Agroalimentaria, Universidad Miguel Hernández, Carretera de Beniel, 03312 Orihuela, Spain
| | - Dorota Szumny
- Department of Pharmacology, Wrocław Medical University, ul. Jana Mikulicza-Radeckiego 2, 50-345 Wrocław, Poland
| | - Adam Figiel
- Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, Chełmońskego 37a, 51-630 Wrocław, Poland
| | - Klaudia Masztalerz
- Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, Chełmońskego 37a, 51-630 Wrocław, Poland
| | - Marta Klemens
- Department of Food Chemistry and Biocatalysis, Wroclaw University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland (A.S.)
| | - Antoni Szumny
- Department of Food Chemistry and Biocatalysis, Wroclaw University of Environmental and Life Sciences, Norwida 25, 50-375 Wrocław, Poland (A.S.)
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Akcicek A, Avci E, Tekin-Cakmak ZH, Kasapoglu MZ, Sagdic O, Karasu S. Influence of Different Drying Techniques on the Drying Kinetics, Total Bioactive Compounds, Anthocyanin Profile, Color, and Microstructural Properties of Blueberry Fruit. ACS OMEGA 2023; 8:41603-41611. [PMID: 37970003 PMCID: PMC10634226 DOI: 10.1021/acsomega.3c05749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/08/2023] [Accepted: 10/10/2023] [Indexed: 11/17/2023]
Abstract
In this study, four different drying techniques, namely, hot air drying (HAD), vacuum drying (VD), ultrasound-assisted vacuum drying (UAVD), and freeze-drying (FD), were applied to blueberries. The drying times of blueberries were 1290, 1050, and 990 min for HAD, VD, and UAVD, respectively, meaning that ultrasound application significantly reduced the drying time. All dried samples except those with FD showed lower total phenolic content and antioxidant capacity than fresh samples. Samples dried with FD had a higher content of bioactive compounds than those dried with other techniques followed by UAVD. The malvidin-3-O-galactoside was the most abundant anthocyanin in the blueberries and was significantly reduced after drying with HAD, VD, and UAVD. Scanning electron microscopy (SEM) analysis of the blueberries dried with FD and UAVD exhibited less shrinkage and cell disruption and more structure. The color parameters L*, a*, and b* values of the samples were significantly affected by the drying technique (p < 0.05). According to the findings of this study, ultrasound-assisted drying technology could be employed to shorten the drying time and improve bioactive retention in blueberry fruits.
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Affiliation(s)
- Alican Akcicek
- Faculty
of Tourism Department of Gastronomy and Culinary Arts, Kocaeli University, Kartepe, 41080 Kocaeli, Turkey
| | - Esra Avci
- Bypro
Functional Food and Biotechnology, Esenler, 34210 Istanbul, Turkey
| | - Zeynep Hazal Tekin-Cakmak
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Davutpasa Campüs, 34210 Istanbul, Turkey
| | | | - Osman Sagdic
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Davutpasa Campüs, 34210 Istanbul, Turkey
| | - Salih Karasu
- Department
of Food Engineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Davutpasa Campüs, 34210 Istanbul, Turkey
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Safarpour B, Kenari RE, Farmani J. Evaluation of antioxidant properties of nanoencapsulated sage ( Salvia officinalis L.) extract in biopolymer coating based on whey protein isolate and Qodumeh Shahri ( Lepidium perfoliatum) seed gum to increase the oxidative stability of sunflower oil. Food Sci Nutr 2023; 11:1394-1402. [PMID: 36911848 PMCID: PMC10002883 DOI: 10.1002/fsn3.3177] [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: 05/11/2022] [Revised: 11/19/2022] [Accepted: 11/30/2022] [Indexed: 12/14/2022] Open
Abstract
Sage leaf extract (SLE) is considered an excellent source of bioactive compounds mainly because of its high content of phenolics, widely known as natural antioxidants. This study aimed to compare the performance of free/encapsulated SLE by different coatings in protecting sunflower oil against oxidative deterioration. The coating materials were whey protein isolate and qodumeh seed gum at different ratios (1:0, 1:1, and 0:1). Each nanocapsule was analyzed for particle size, zeta potential, encapsulation efficiency, phenolics release, and SEM images. The total phenolic compounds of SLE were 31.12 mg GA/g. The antioxidant activity of SLE was increased in both DPPH and FRAP assays by increasing extract concentration from 50 to 250 ppm. All nanoparticles exhibited nanometric size, negative zeta potential, encapsulation efficiency higher than 60%, and gradual release during storage. The oxidative stability of sunflower oil with or without the incorporation of 250 ppm of free/encapsulated SLE was evaluated during 24 days of storage at 60°C. Peroxide value (PV), thiobarbituric acid value (TBA), oxidative stability index (OSI), color index (CI), and conjugated dienes (CD) were determined. COPM nanoparticles showed the lowest PV, TBA, CI, and CD but both SGUM and WHEY were more effective in delaying oil oxidation than TBHQ and free extract. Higher OSI was observed in oil-containing nanoparticles with composite coating. Results obtained reinforce the use of whey protein isolate and qodumeh seed gum as a coating for encapsulating SLE to increase the shelf life of sunflower oil as a natural antioxidant.
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Affiliation(s)
- Behnaz Safarpour
- Department of Food Science and TechnologySari Agricultural Sciences and Natural Resources UniversitySariIran
| | - Reza E. Kenari
- Department of Food Science and TechnologySari Agricultural Sciences and Natural Resources UniversitySariIran
| | - Jamshid Farmani
- Department of Food Science and TechnologySari Agricultural Sciences and Natural Resources UniversitySariIran
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Chaves RPF, de Araújo AL, Lopes AS, Pena RDS. Convective Drying of Purple Basil ( Ocimum basilicum L.) Leaves and Stability of Chlorophyll and Phenolic Compounds during the Process. PLANTS (BASEL, SWITZERLAND) 2022; 12:127. [PMID: 36616256 PMCID: PMC9824209 DOI: 10.3390/plants12010127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/11/2022] [Accepted: 12/19/2022] [Indexed: 06/17/2023]
Abstract
This study evaluated the effect of convective drying on the degradation of color and phenolic compounds of purple basil (Ocimum basilicum L.) leaves, and the hygroscopic behavior of dried leaves. The fresh leaves underwent drying at 40 °C, 50 °C, 60 °C, and 70 °C. Degradation of chlorophyll, flavonoids, and phenolic compounds were evaluated during drying and the hygroscopicity was evaluated through the moisture sorption isotherms. The drying mathematical modeling and the moisture sorption data were performed. The effective diffusivity for the drying increased from 4.93 × 10−10 m2/s at 40 °C to 18.96 × 10−10 m2/s at 70 °C, and the activation energy value (39.30 kJ/mol) showed that the leaves present temperature sensibility. The leaves dried at 40 °C had less degradation of phenolic compounds and color variation, but the drying process was too slow for practical purposes. Modified Page, Diffusion Approximation, and Verna models had excellent accuracy in drying kinetics. The isotherms showed that, in environments with relative humidity above 50%, the purple basil leaves are more susceptible to water gain, and at 8.83 g H2O/100 g db moisture, it guarantees the microbiological stability of the dried leaves. The Oswin model was the most suitable for estimating the moisture sorption isotherms of the dried leaves.
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Affiliation(s)
- Rosane Patricia Ferreira Chaves
- Graduated Program in Food Science and Technology, Institute of Technology, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil
| | - Adriano Lucena de Araújo
- Graduated Program in Food Science and Technology, Institute of Technology, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil
| | - Alessandra Santos Lopes
- Graduated Program in Food Science and Technology, Institute of Technology, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil
- Faculty of Food Engineering, Institute of Technology, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil
| | - Rosinelson da Silva Pena
- Graduated Program in Food Science and Technology, Institute of Technology, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil
- Faculty of Food Engineering, Institute of Technology, Federal University of Pará (UFPA), Belém 66075-110, PA, Brazil
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Zia S, Khan MR, Aadil RM. Kinetic modeling of different drying techniques and their influence on color, bioactive compounds, antioxidant indices and phenolic profile of watermelon rind. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2022. [DOI: 10.1007/s11694-022-01674-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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7
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Oloniyo RO, Omoba OS, Awolu OO, Esan YO. Functional Properties, Fourier Transform Infrared of Cream and Orange Fleshed Sweet Potato Flour and Sensory Evaluation of Its Dough Meal. JOURNAL OF CULINARY SCIENCE & TECHNOLOGY 2022. [DOI: 10.1080/15428052.2022.2112351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
| | | | | | - Yetunde Oyebola Esan
- Department of Food Science and Technology, Joseph Ayo Babalola University, Ikeji-Arakeji, Nigeria
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Maleš I, Dragović-Uzelac V, Jerković I, Zorić Z, Pedisić S, Repajić M, Garofulić IE, Dobrinčić A. Non-Volatile and Volatile Bioactives of Salvia officinalis L., Thymus serpyllum L. and Laurus nobilis L. Extracts with Potential Use in the Development of Functional Beverages. Antioxidants (Basel) 2022; 11:antiox11061140. [PMID: 35740037 PMCID: PMC9220411 DOI: 10.3390/antiox11061140] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/06/2022] [Accepted: 06/07/2022] [Indexed: 01/12/2023] Open
Abstract
Functional beverages based on herbal extracts are highly demanded products due to the presence of bioactives with promising health benefits and interesting and characteristic sensory properties. Mediterranean medicinal and aromatic herbs contain a wide range of bioactives (non-volatile polyphenols, volatile terpenes) that are important constituents of herbal extracts and essential oils. The antioxidant capacity and potential health benefits of these bioactives could be associated with their synergistic effects. Therefore, this study aimed to characterize the non-volatile and volatile bioactives of sage (Salvia officinalis L.), wild thyme (Thymus serpyllum L.) and laurel (Laurus nobilis L.) aqueous extracts and their two- and three-component mixtures as well as their antioxidant capacity. The content of total phenols, flavonoids, hydroxycinnamic acids and flavonols was determined spectrophotometrically. Individual polyphenols were analyzed by LC-MS/MS, the volatiles were analyzed by HS-SPME/GC-MS, and the antioxidant capacity was analyzed by ORAC and DPPH assays. The results showed that aqueous extracts of all examined herbs and their mixtures contained a high content of phenolic compounds ranging from 0.97 to 2.79 g L-1 of the sample, among which the most common were flavonols. At the same time, mono- and sesquiterpenes were the main volatiles. All extracts showed high antioxidant capacity, especially L. nobilis (781.62 ± 5.19 μmol TE mL-1 of the sample in the DPPH assay; 1896.10 ± 8.77 μmol TE mL-1 of the sample in the ORAC assay) and the two-component mixture of L. nobilis and T. serpyllum (679.12 ± 5.19 μmol TE mL-1 in the DPPH assay; 1913.38 ± 8.77 μmol TE mL-1 in the ORAC assay). Mixtures of herbal extracts have been shown to possess additive or synergistic effects, consequently contributing to higher antioxidant capacity. Therefore, two-component mixtures of herbal extracts showed promising potential for the production of functional beverages.
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Affiliation(s)
- Ivanka Maleš
- Department of Pharmacy, The School of Medicine, University of Split, 21000 Split, Croatia;
| | - Verica Dragović-Uzelac
- Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia; (Z.Z.); (S.P.); (M.R.); (I.E.G.)
- Correspondence: (V.D.-U.); (A.D.)
| | - Igor Jerković
- Department of Organic Chemistry, Faculty of Chemistry and Technology, University of Split, 21000 Split, Croatia;
| | - Zoran Zorić
- Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia; (Z.Z.); (S.P.); (M.R.); (I.E.G.)
| | - Sandra Pedisić
- Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia; (Z.Z.); (S.P.); (M.R.); (I.E.G.)
| | - Maja Repajić
- Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia; (Z.Z.); (S.P.); (M.R.); (I.E.G.)
| | - Ivona Elez Garofulić
- Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia; (Z.Z.); (S.P.); (M.R.); (I.E.G.)
| | - Ana Dobrinčić
- Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia; (Z.Z.); (S.P.); (M.R.); (I.E.G.)
- Correspondence: (V.D.-U.); (A.D.)
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Drying kinetics, total bioactive compounds, antioxidant activity, phenolic profile, lycopene and β-carotene content and color quality of Rosehip dehydrated by different methods. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.112476] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Effects of Different Drying Methods and Temperature on the Drying Behavior and Quality Attributes of Cherry Laurel Fruit. Processes (Basel) 2020. [DOI: 10.3390/pr8070761] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
This study aimed to investigate the effect of different drying methods and drying temperature on the drying kinetics, total bioactive compounds, phenolic profile, microstructural properties, rehydration kinetics, and color change of cherry laurel fruit. For this aim, hot air drying (HAD), ultrasound-assisted vacuum drying (USV), and freeze-drying (FD) were conducted on drying of cherry laurel. HAD and USV were conducted at 50, 60, and 70 °C. Drying times of the samples were 1980, 1220, and 770 min for HAD at 50, 60 and 70 °C, and 950, 615, and 445 min at 50, 60, and 70 °C, respectively, for USV. The total bioactive compound was significantly affected by both drying methods and temperature (p < 0.05). FD exhibited the highest total phenolic (TPC), total flavonoid (TFC), total anthocyanin (TAC), and antioxidant capacity value USV showed a higher amount of bioactive compounds than those of HAD at the same drying temperature. The content of total bioactive compounds significantly increased as the temperature increased for both HAD and USV (p < 0.05). The chlorogenic acid was identified as a major phenolic, and its amount significantly depended on drying methods (p < 0.05). SEM images described the surface characteristic of dried samples. HAD dried products showed higher shrinkage compared to FD and USV. All drying methods significantly affected the total color difference (ΔE) values (p < 0.05). This study proposed that USV could be as an alternative method to HAD due to higher bioactive compounds retention and rehydration ratio, shorter drying time, less color change, and shrinkage formation.
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Mathematical modelling of lemon verbena leaves drying in a continuous flow dryer equipped with a solar pre-heating system. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2020. [DOI: 10.15586/qas2019.658] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Effects of Different Drying Methods on Drying Kinetics, Microstructure, Color, and the Rehydration Ratio of Minced Meat. Foods 2019; 8:foods8060216. [PMID: 31216705 PMCID: PMC6617532 DOI: 10.3390/foods8060216] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 06/06/2019] [Accepted: 06/07/2019] [Indexed: 11/20/2022] Open
Abstract
This study aimed to investigate the effect of different drying methods, namely ultrasound-assisted vacuum drying (USV), vacuum drying (VD), and freeze-drying (FD), on the drying kinetics and some quality parameters of dried minced meat. In this study, USV was for the first time applied to the drying of minced meat. The USV and VD methods were conducted at 25 °C, 35 °C, and 45 °C. The different drying methods and temperatures significantly affected the drying time (p < 0.05). The USV method showed lower drying times at all temperatures. The rehydration values of the freeze-dried minced meat samples were higher than those obtained by the USV and VD techniques. The samples prepared using USV showed higher rehydration values than the vacuum dried samples for all temperatures. The effects of the different drying techniques and drying conditions on the microstructural properties of the minced meat samples were investigated using scanning electron microscope (SEM). The USV method resulted in higher porosity and a more open structure than the VD method. Total color differences (ΔE) for VD, USV, and FD were 8.27–20.81, 9.58–16.42, and 9.38, respectively, and were significantly affected by the drying methods and temperatures (p < 0.05). Higher drying temperature increased the ΔE value. Peroxide values (PV) significantly increased after the drying process, and samples treated with USV showed lower PV values than the VD treated samples. This study suggests that USV could be used as an alternative drying method for minced meat drying due to lower drying times and higher quality parameters.
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