Characterization and quality assessment of Astragalus slices dried using plasma synergistic technology

Abstract

Plasma drying, as a non-thermal food drying technology, has received widespread attention due to its lower energy consumption and better quality of dried products compared with traditional thermal drying technology. To enhance the drying rate, this study incorporated crossflow and hot airflow to facilitate drying in conjunction with plasma treatment. These methods were termed convection-plasma synergistic drying (CPD) and hot air-plasma synergistic drying (HAPD). The dried Astragalus slices obtained from CPD and HAPD were compared with samples dried by plasma drying (PD), hot air drying (HAD), and natural drying (ND). The findings revealed that plasma synergistic drying reduced the drying duration by 41.67% and 25%, respectively, compared to PD. Notably, the shrinkage of Astragalus slices after PD was minimal, registering 31.79% and 22.44% lower rates than those observed for ND and HAD, respectively. After HAPD, the rehydration ratio of the Astragalus slices reached its peak, exceeding those of ND and HAD by 30.57% and 32.89%, respectively. Astragalus exhibited a loose and porous structure after plasma intervention, contrasting with surface collapses observed post-HAD and surface cracks evident after ND. The study noted a significant increase in astragaloside content after CPD, surpassing that of ND and HAD by 23.43% and 67.78%, respectively. Similarly, the mullein isoflavones content peaked after PD, measuring 29.89% and 28.02% higher than that of ND and HAD, respectively. Additionally, the study explored the internal water migration mechanism of Astragalus slices during the drying process using LF-NMR analysis.

Keywords

Plasma synergistic drying / Astragalus slices / Quality evaluation / LF-NMR

Author contributions

The authors confirm their contribution to the paper as follows: study conception and design: Hou Q, Liu J, Chang Z; experimental processing: Hou Q, Ma S, Guo H; data collection & validation: Hou Q; analysis & interpretation of results: Hou Q, Liu J; draft manuscript preparation: Hou Q, Chang Z; language editing, manuscript revision: Hou Q, Chang Z. All authors reviewed the results and approved the final version of the manuscript.

Data availability

The datasets generated during the current study are available from the corresponding author upon reasonable request.

Acknowledgments

This work was funded by the key R&D Program of Shaanxi Province, China (2021GXLH-Z-090).

Conflict of interest

The authors declare that they have no conflict of interest.

References

[1] Ma Y, Hu J, Wu W, Duan Y, Fan C, et al. 2022. Research progress on chemical constituents and pharmacological effects of Radix astragali. Acta Chinese Medicine and Pharmacology 50( 4):92-95

[2] Tang W, Li G, Jin X. 2015. Comparison of the effective components on different harvesting periods of Radix astragali. Northern Horticulture 39(7):138-41

[3] Zhu Y, Ouyang W, Lu B, Lu S, Feng S, et al. 2024. Rehydration characteristics of dried icefish (Salangidae) with different drying methods by lowfield nuclear magnetic resonance and magnetic resonance imaging. Journal of Food Process Engineering 47( 1):e14511

[4] Chatzilia T, Kaderides K, Goula AM. 2023. Drying of peaches by a combination of convective and microwave methods. Journal of Food Process Engineering 46( 4):e14296

[5] Martynenko A, Kudra T, Yue J. 2017. Multipin EHD dryer: effect of electrode geometry on charge and mass transfer. Drying Technology 35(16):1970-80

[6] Mahiuddin M, Khan MIH, Kumar C, Rahman MM, Karim MA. 2018. Shrinkage of food materials during drying: current status and challenges. Comprehensive Reviews in Food Science and Food Safety 17( 5):1113-26

[7] Zhang X, Zhong C, Mujumdar A, Yang X, Deng L, et al. 2019. Cold plasma pretreatment enhances drying kinetics and quality attributes of chili pepper (Capsicum annuum L.). Journal of Food Engineering 241:51-57

[8] Ni JB, Zhang JS, Bhandari B, Xiao HW, Ding CJ, et al. 2022. Effects of dielectric barrier discharge (DBD) plasma on the drying kinetics, color, phenolic compounds, energy consumption and microstructure of lotus pollen. Drying Technology 40(15):3100-14

[9] Zhou YH, Vidyarthi SK, Zhong CS, Zheng ZA, An Y, et al. 2020. Cold plasma enhances drying and color, rehydration ratio and polyphenols of wolfberry via microstructure and ultrastructure alteration. LWT 134:110173

[10] Zielinska S, Staniszewska I, Liu ZL, Zielinska D, Pan Z, et al. 2023. Effect of cold atmospheric pressure plasma pretreatment on the drying kinetics, physicochemical properties and selected bioactive compounds of okra pods subjected to hot air impingement drying. Drying Technology 41(15):2405-17

[11] Chen Y, Dong Y, Tian Y, Chang Z. 2023. Study on the effect of plasma drying and sterilization of pepper seeds. Drying Technology 41(10):1583-94

[12] Mirzaei-Baktash H, Hamdami N, Torabi P, Fallah-Joshaqani S, Dalvi-Isfahan M. 2022. Impact of different pretreatments on drying kinetics and quality of button mushroom slices dried by hot-air or electrohydrodynamic drying. LWT 15:112894

[13] Jahanbakhshi A, Yeganeh R, Momeny M. 2020. Influence of ultrasound pre-treatment and temperature on the quality and thermodynamic properties in the drying process of nectarine slices in a hot air dryer. Journal of Food Processing and Preservation 44(10):e14818

[14] Kaveh M, Karami H, Jahanbakhshi A. 2020. Investigation of mass transfer, thermodynamics, and greenhouse gases properties in pennyroyal drying. Journal of Food Process Engineering 43( 8):e13446

[15] Taghian Dinani S, Havet M, Hamdami N, Shahedi M. 2014. Drying of mushroom slices using hot air combined with an electrohydrodynamic (EHD) drying system. Drying Technology 32(5):597-605

[16] Zhong C, Martynenko A, Wells P, Adamiak K. 2019. Numerical investigation of the multi-pin electrohydrodynamic dryer: Effect of cross-flow air stream. Drying Technology 37(13):1665-77

[17] Miraei Ashtiani SH, Rafiee M, Mohebi Morad M, Khojastehpour M, Khani MR, et al. 2020. Impact of gliding arc plasma pretreatment on drying efficiency and physicochemical properties of grape. Innovative Food Science & Emerging Technologies 63:102381

[18] Li L, Zhang M, Zhou L. 2021. A promising pulse-spouted microwave freeze drying method used for Chinese yam cubes dehydration: Quality, energy consumption, and uniformity. Drying Technology 39(2):148-61

[19] Elmizadeh A, Shahedi M, Hamdami N. 2018. Quality assessment of electrohydrodynamic and hot-air drying of quince slice. Industrial Crops and Products 116:35-40

[20] Khraisheh MAM, McMinn WAM, Magee TRA. 2004. Quality and structural changes in starchy foods during microwave and convective drying. Food Research International 37( 5):497-503

[21] Yu F, Wan N, Li Y, Wang X, Wu Z, et al. 2021. Analysis on change rule and mechanism in physical and chemical properties of Chinese herbal medicines during drying. Chinese Traditional and Herbal Drugs 52( 7):2144-53

[22] An NN, Sun WH, Li, BZ, Wang Y, Shang N, et al. 2022. Effect of different drying techniques on drying kinetics, nutritional components, antioxidant capacity, physical properties and microstructure of edamame. Food Chemistry 373:131412

[23] Chen Q, Li Z, Bi J, Zhou L, Yi J, et al. 2017. Effect of hybrid drying methods on physicochemical, nutritional and antioxidant properties of dried black mulberry. LWT 80:178-84

[24] Ashtiani SM, Aghkhani MH, Feizy J, Martynenko A. 2023. Effect of cold plasma pretreatment coupled with osmotic dehydration on drying kinetics and quality of mushroom (Agaricus bisporus). Food and Bioprocess Technology 16:2854-76

[25] Martynenko A, Bashkir I, Kudra T. 2021. Electrically enhanced drying of white champignons. Drying Technology 39(2):234-44

[26] Singh B, Suri K, Shevkani K, Kaur A, Kaur A, et al. 2018. Enzymatic browning of fruit and vegetables:a review. In Enzymes in Food Technology, ed. Kuddus M. Singapore: Springer Press. pp. 63-78. doi: 10.1007/978-981-13-1933-4_4

[27] Huang CC, Wu JSB, Wu JS, Ting Y. 2019. Effect of novel atmosphericpressure jet pretreatment on the drying kinetics and quality of white grapes. Journal of the Science of Food and Agriculture 99(11):5102-11

[28] Özbek HN. 2021. Radio frequency-assisted hot air drying of carrots for the production of carrot powder: kinetics and product quality. LWT 152:112332

[29] Tabibian SA, Labbafi M, Askari GH, Rezaeinezhad AR, Ghomi H. 2020. Effect of gliding arc discharge plasma pretreatment on drying kinetic, energy consumption and physico-chemical properties of saffron (Crocus sativus L.). Journal of Food Engineering 270:109766

[30] Truong T, Truong V, Shu F, Bhandari B. 2019. Changes in physicochemical properties of rice in response to high-temperature fluidized bed drying and tempering. Drying Technology 37(3):331-40

[31] Shi MH, Wang X. 2010. Investigation on moisture transfer mechanism in porous media during rapid drying process. Drying Technology 22(1-2):111-22

[32] Karim N, Shishir MRI. Bao T, Chen W. 2021. Effect of cold plasma pretreated hot-air drying on the physicochemical characteristics, nutritional values and antioxidant activity of shiitake mushroom. Journal of the Science of Food and Agriculture 101:6271-80

[33] Zhang Z, Yu J, Cheng P, Wang S, Hang F, et al. 2022. Effect of different process parameters and ultrasonic treatment during solid osmotic dehydration of jasmine for extraction of flavoured syrup on the mass transfer kinetics and quality attributes. Food and Bioprocess Technology 15:1055-72

[34] Bai Y, Qu M, Luan Z, Li X, Yang Y. 2013. Electrohydrodynamic drying of sea cucumber (Stichopus japonicus). LWT - Food Science and Technology 54( 2):570-76

[35] Luan Z, Zhang D, Liu B, Wei Y, Wang Y. 2019. Effects of astragaloside on VEGF/VEGFR2 signaling pathway in mice with pulmonary fibrosis. Lishizhen Medicine And Materia Medica Research 30( 7):1611-13

[36] Jiang G, He S, Liu S. 2013. Effect of different drying methods on the quality Smilax glabra Roxb. Journal of Guangdong Pharmaceutical University 29( 3):258-61

[37] Ahmedou SO, Rouaud O, Havet M. 2009. Assessment of the Electrohydrodynamic Drying Process. Food and Bioprocess Technology 2:240-247

[38] Thuwapanichayanan R, Prachayawarakorn S, Soponronnarit S. 2008. Drying characteristics and quality of banana foam mat. Journal of Food Engineering 86( 4):573-83

[39] Wang L, Xu B, Wei B, Zeng R. 2018. Low frequency ultrasound pretreatment of carrot slices: effect on the moisture migration and quality attributes by intermediate-wave infrared radiation drying. Ultrasonics Sonochemistry 40:619-28