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Athira VA, Gokulvel E, Nandhu Lal AM, Venugopalan VV, Rajkumar, Venkatesh T. Advances in drying techniques for retention of antioxidants in agro produces. Crit Rev Food Sci Nutr 2022; 63:10849-10865. [PMID: 35653131 DOI: 10.1080/10408398.2022.2082371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Antioxidants are compounds that are essential for the human body which prevents cell from disease causing free radicals. Antioxidants are present in a wide range of fruits, vegetables, and spices. However, a considerable amount of antioxidants is lost during the post-harvest drying operation of agro produces for their shelf-life enhancement. Hence, retention of antioxidants becomes utmost importance in preserving the nutritional aspects of fruits and vegetables. Compared to conventional hot air drying, methods like freeze drying, vacuum drying, and dehumidified drying helps in the retention of antioxidants. However, the drawbacks prevalent in current drying practices, such as high-power consumption and high capital cost, could be eliminated by adopting novel drying mechanisms. This review focuses on various pretreatment methods like ultra-sonication, high pressure processing, pulsed electric field and ethanol treatment prior to drying operation helps in enhancing the drying efficiency with maximum retention of antioxidants. In addition, hybrid drying technologies such as microwave assisted drying, IR-radiated drying and electro-magnetic assisted drying methods also could significantly improve the retention of antioxidants.HIGHLIGHTSDrying is the most commonly adopted unit operation for enhancing the shelf life of perishable agro produces.However, drying is accompanied by loss of bioactive, color, texture, and sensory attributes.Compared to conventional drying techniques like hot air drying, methods like freeze drying, vacuum drying and dehumidified drying helps in the retention of antioxidants present in agro/food produces.Pretreatment methods like Ozonation, ultra-sonication, and UV radiation prior to drying are also found to improve the drying performance with good retention of antioxidants.Recent developments like microwave-assisted and IR-assisted drying methods perform well in the retention of antioxidants with less energy consumption.
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Affiliation(s)
- V A Athira
- Agro Processing and Technology Division, CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India
| | - E Gokulvel
- Agro Processing and Technology Division, CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India
| | - A M Nandhu Lal
- Agro Processing and Technology Division, CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India
| | - V V Venugopalan
- Agro Processing and Technology Division, CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India
| | - Rajkumar
- Research Planning and Business Development, CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India
| | - T Venkatesh
- Agro Processing and Technology Division, CSIR - National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India
- Academy of Scientific and Innovative Research, Ghaziabad, India
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Bhat TA, Hussain SZ, Wani SM, Rather MA, Reshi M, Naseer B, Qadri T, Khalil A. The impact of different drying methods on antioxidant activity, polyphenols, vitamin C and rehydration characteristics of Kiwifruit. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Souza AUD, Corrêa JLG, Tanikawa DH, Abrahão FR, Junqueira JRDJ, Jiménez EC. Hybrid microwave-hot air drying of the osmotically treated carrots. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.113046] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
The immersion of food in a hypertonic solution results in an osmotic dehydration process (OD) with the loss of water (WL) from the food to the solution and the gain of solids from the solution (SG) by the food. For this reason, OD is commonly used to produce semi-dehydrated or enriched foods by incorporation. Although the most of OD studies are focused on the WL and SG processes, many publications addresses the physicochemical and nutritional changes resulting from OD in the food matrix and in the osmotic solution. Such changes must be handled in order to improve the quality of the product. This work is a compilation of publications with this approach.
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Elangovan E, Natarajan SK. Experimental Research of Drying Characteristic of Red Banana in a Single Slope Direct Solar Dryer Based on Natural and Forced Convection. Food Technol Biotechnol 2021; 59:137-146. [PMID: 34316275 PMCID: PMC8284107 DOI: 10.17113/ftb.59.02.21.6876] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 03/16/2021] [Indexed: 11/12/2022] Open
Abstract
Research background Traditionally, open sun drying method serves to dry the products for long time preservation. Solar drying is also employed to minimise the drying time to achieve the required moisture content. This method inherently contains complex heat and mass transfer mechanisms, which makes difficult to describe drying kinetics at the micro level. Experimental approach In this paper, research is carried out to investigate the drying of 5 mm thick slices of red banana (Musa acuminata 'Red Dacca') in a single slope solar dryer based on natural and forced convection. Based on the experiments, a new semi-empirical thin layer drying kinetics is proposed and compared with other existing models. The proposed model with the correlation coefficient (R2) of 0.997 is in very good agreement with other well-known models. Based on the model, we calculated the moisture diffusivity and activation energy of the red banana drying process. Results and conclusions It was found that the moisture diffusivity of the red banana samples was in the range 0.87-1.56·10-9 m2/s for natural convection solar drying and 0.84-2.61·10-8 m2/s for forced convection solar drying. The activation energy of the red banana varied from 24.58 to 45.20 kJ/mol for passive and 22.56 to 35.49 kJ/mol for active drying. Besides, we carried out energy and exergy analyses of red banana in the dryers and found that the average exergy losses in the forced and natural convections were 16.1 and 6.63 kJ/kg and the average exergic efficiency of the natural and forced convection dryers was 57.7 and 70.9%, respectively. Novelty and scientific contribution A single slope direct solar dryer was designed and built to maintain the desired temperature for a specified period in both natural and forced convection mode. A novel drying kinetics model with higher correlation coefficient (R2) than the other drying kinetic models is proposed for the preservation of red bananas.
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Affiliation(s)
- Elavarasan Elangovan
- Department of Mechanical Engineering, National Institute of Technology Puducherry, 609609 Karaikal.,UT of Puducherry, India
| | - Sendhil Kumar Natarajan
- Department of Mechanical Engineering, National Institute of Technology Puducherry, 609609 Karaikal.,UT of Puducherry, India
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Kroehnke J, Szadzińska J, Radziejewska-Kubzdela E, Biegańska-Marecik R, Musielak G, Mierzwa D. Osmotic dehydration and convective drying of kiwifruit (Actinidia deliciosa) - The influence of ultrasound on process kinetics and product quality. ULTRASONICS SONOCHEMISTRY 2021; 71:105377. [PMID: 33152618 PMCID: PMC7786549 DOI: 10.1016/j.ultsonch.2020.105377] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 09/23/2020] [Accepted: 10/20/2020] [Indexed: 05/20/2023]
Abstract
The aim of this study was to assess the impact of ultrasound on two subsequent processes - initial osmotic dehydration and convective drying of kiwifruit (Actinidia deliciosa). The effect of ultrasound (at a frequency of 25 kHz) was assessed both in terms of process kinetics and product quality. During the study, three different osmotic agents were used - erythritol, sorbitol, and sucrose - in an aqueous solution at a concentration of 50% (w/w). The essential kinetic parameters were analyzed - water loss and increase of dry matter during osmotic dehydration, and evolution of moisture content and temperature of samples during convective drying (drying curves). Product quality was assessed on the basis of color, water activity, and content of relevant bioactive components - polyphenols and carotenoids. It was found that the application of ultrasound during osmotic dehydration resulted in higher water loss and solid gain. This surely results from the phenomena occurring during the propagation of the elastic waves in the liquid medium (mainly related to cavitation) and enhancement of the mass transfer. The use of ultrasound during convective drying also had a positive effect on the kinetics of this process. In most cases, during the ultrasonically assisted drying operations, a significant increase in drying rate was observed, leading to a reduction in drying time. This may be due to the intensification of both heat and mass transfer as a result of the mechanical and thermal effects of ultrasound. The assessment of product quality showed that the use of sugar alcohols was a good alternative to sucrose, and ultrasound-assisted convective drying increased the retention of valuable carotenoids and polyphenols. Moreover, in all dried kiwifruit slices, water activity was below 0.6, which can guarantee the microbiological stability of the tested samples.
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Affiliation(s)
- Joanna Kroehnke
- Poznań University of Technology, Institute of Technology and Chemical Engineering, Department of Process Engineering, ul. Berdychowo 4, 60-965 Poznań, Poland.
| | - Justyna Szadzińska
- Poznań University of Technology, Institute of Technology and Chemical Engineering, Department of Process Engineering, ul. Berdychowo 4, 60-965 Poznań, Poland.
| | - Elżbieta Radziejewska-Kubzdela
- Poznan University of Life Sciences, Institute of Food Technology of Plant Origin, ul. Wojska Polskiego 31, 60-624 Poznań, Poland.
| | - Roża Biegańska-Marecik
- Poznan University of Life Sciences, Institute of Food Technology of Plant Origin, ul. Wojska Polskiego 31, 60-624 Poznań, Poland.
| | - Grzegorz Musielak
- Poznań University of Technology, Institute of Technology and Chemical Engineering, Department of Process Engineering, ul. Berdychowo 4, 60-965 Poznań, Poland.
| | - Dominik Mierzwa
- Poznań University of Technology, Institute of Technology and Chemical Engineering, Department of Process Engineering, ul. Berdychowo 4, 60-965 Poznań, Poland.
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Kowalska H, Marzec A, Domian E, Masiarz E, Ciurzyńska A, Galus S, Małkiewicz A, Lenart A, Kowalska J. Physical and Sensory Properties of Japanese Quince Chips Obtained by Osmotic Dehydration in Fruit Juice Concentrates and Hybrid Drying. Molecules 2020; 25:molecules25235504. [PMID: 33255419 PMCID: PMC7727861 DOI: 10.3390/molecules25235504] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 11/20/2020] [Accepted: 11/21/2020] [Indexed: 11/16/2022] Open
Abstract
Japanese quince has high health value, but due to its taste and texture, it is difficult to eat raw. The use of innovative drying methods to produce dried snack foods from these fruits may be of interest to producers and consumers. The physicochemical and sensory properties of 3 mm slices of Japanese quince fruit (with skin, without seeds) obtained by osmotic pre-treatment in chokeberry and apple juice concentrates, and with the use of convection (convective drying, C-D), freeze-drying (F-D), and convection-microwave-vacuum drying (hybrid) are assessed. The methods of drying osmo-dehydrated slices do not affect the dry matter content. In most dried quince, the water activity is 0.40 or lower. Pre-osmotic dehydration and drying have a significant impact on the mechanical and acoustic properties of quince chips. Sensory attractive chips emit loud acoustic emission (AE) during the breaking test. Chips that are osmo-dehydrated in a mixture of chokeberry juice concentrate and sucrose and dried by a hybrid method are attractive. They have a dark red color given by chokeberry concentrate and a slight sweet (with a slight sour-bitter) taste. The sensory evaluation was useful for determining the quality of the chips in terms of their texture (crispness) tested by mechanical methods. Their sensory ratings (overall desirability as weight of color, taste, crispness, and flavor) are high and similar (from 3.8 to 4.1). The use of innovative drying methods with pre-osmotic treatment allows obtaining dried material with properties comparable to those obtained by the F-D method, but in a much shorter time, i.e., with lower energy and using a simple method.
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Affiliation(s)
- Hanna Kowalska
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
- Correspondence: ; Tel.: +48-22-5937-565
| | - Agata Marzec
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Ewa Domian
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Ewelina Masiarz
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Agnieszka Ciurzyńska
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Sabina Galus
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Aleksandra Małkiewicz
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Andrzej Lenart
- Department of Food Engineering and Process Management, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland; (A.M.); (E.D.); (E.M.); (A.C.); (S.G.); (A.M.); (A.L.)
| | - Jolanta Kowalska
- Department of Technology and Food Evaluation, Institute of Food Sciences, Warsaw University of Life Sciences, 159c Nowoursynowska St., 02-776 Warsaw, Poland;
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Llavata B, García-Pérez JV, Simal S, Cárcel JA. Innovative pre-treatments to enhance food drying: a current review. Curr Opin Food Sci 2020. [DOI: 10.1016/j.cofs.2019.12.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Zielinska M, Ropelewska E, Xiao HW, Mujumdar AS, Law CL. Review of recent applications and research progress in hybrid and combined microwave-assisted drying of food products: Quality properties. Crit Rev Food Sci Nutr 2019; 60:2212-2264. [PMID: 31257908 DOI: 10.1080/10408398.2019.1632788] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The growing concerns over product quality have increased demand for high quality dried food products and encouraged researchers to explore and producers of such products to implement novel microwave (MW)-assisted drying methods. This paper presents a critical review of the key principles and drawbacks of MW-assisted drying as well as needs for future research. In this article, recent research into application of microwaves as an alternative heat source, applications and progress in hybrid MW-assisted drying that rely on various drying media and combined two or three stages of MW-assisted drying for the preservation of food products is reviewed critically. The effect of different MW-assisted drying methods, conditions and initial pretreatments on the thermophysical properties, color, nutritional value and rehydration potential of dried food products is discussed in detail along with the discussion on how the material properties evolve and change in structure, color, and composition during MW-assisted drying and recent attempts at mathematical modeling of these changes made for different fruits and vegetables. It should be noted that most of the published results were obtained in laboratory-scale dryers. Pilot-scale testing is needed to bridge the gap between laboratory research and industrial applications to fulfill the potential for novel hybrid and combined MW-assisted drying methods and to expand their role in food processing.
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Affiliation(s)
- Magdalena Zielinska
- Department of Systems Engineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Ewa Ropelewska
- Department of Systems Engineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Hong-Wei Xiao
- College of Engineering, China Agricultural University, Beijing, China
| | - Arun S Mujumdar
- Department of Bioresource Engineering, McGill University, Québec, Canada
| | - Chung L Law
- Department of Chemical and Environmental Engineering, The University of Nottingham, Semenyih, Malaysia
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Sun Y, Zhang M, Mujumdar A. Berry Drying: Mechanism, Pretreatment, Drying Technology, Nutrient Preservation, and Mathematical Models. FOOD ENGINEERING REVIEWS 2019. [DOI: 10.1007/s12393-019-9188-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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