Abstract
Tea-based ready-to-drink (RTD) beverages have been commercialized in recent years, which are usually preserved by conventional thermal processes. However, intense thermal processing can significantly affect their sensory and nutritional quality. Pulsed UV light processing has emerged as a potent non-thermal technology for processing of liquid foods, which can be applied as a hurdle approach with milder thermal processing. This makes it important to study the effects of the pulsed UV light on quality of tea. Therefore, this study was carried out to assess the effect of pulsed UV light on black tea infusions (at two different concentrations—1:100 w/v and 1:50 w/v). The pulse frequency (1–10 Hz) and treatment time (5–50 s) were varied to impart pulsed light fluence in the range 1.07–17.2 J/cm2, and their effect on physico-chemical properties, total phenolic content, and antioxidant activity of tea infusions were studied. The temperature and color of the samples were significantly affected, whereas the total phenolic content and antioxidant activity remained mostly unaffected. The effects of the processing variables were also analyzed using response surface methodology and optimized treatment conditions were determined. Overall, pulsed UV light treatment can be used to assist thermal processing of polyphenol-rich liquid foods.
Data Availability
All data are presented in this manuscript.
References
Agüero, M. V., Jagus, R. J., Martín-Belloso, O., & Soliva-Fortuny, R. (2016). Surface decontamination of spinach by intense pulsed light treatments: Impact on quality attributes. Postharvest Biology and Technology, 121, 118–125.
Artíguez, M. L., Lasagabaster, A., & de Marañón, I. M. (2011). Factors affecting microbial inactivation by pulsed light in a continuous flow-through unit for liquid products treatment. Procedia Food Science, 1, 786–791.
Canadian Food Inspection Agency (CFIA). (2021). Bacterial Pathogens in Dried Herbs and Dried Teas - April 1, 2014 to March 31, 2018. Food microbiology - Targeted Surveys – Final report. https://inspection.canada.ca/DAM/DAM-food-aliments/STAGING/text-texte/bacterial_pathogens_in_dried_herbs_and_dried_teas_1553013196262_eng.pdf(Accessed on 23rd Aug 2021).
Chandini, S. K., Rao, L. J., & Subramanian, R. (2013). Membrane clarification of black tea extracts. Food and Bioprocess Technology, 6(8), 1926–1943.
Chen, Z. Y., Zhu, Q. Y., Wong, Y. F., Zhang, Z., & Chung, H. Y. (1998). Stabilizing effect of ascorbic acid on green tea catechins. Journal of Agricultural and Food Chemistry, 46(7), 2512–2516.
Dubey, K. K., Janve, M., Ray, A., & Singhal, R. S. (2020). Ready-to-drink tea. Charis M. Galanakis (Eds.), Trends in non-alcoholic beverages (pp. 101–140). Academic Press.
Ferrario, M., Alzamora, S. M., & Guerrero, S. (2013). Inactivation kinetics of some microorganisms in apple, melon, orange and strawberry juices by high intensity light pulses. Journal of Food Engineering, 118(3), 302–311.
Ferrario, M., Alzamora, S. M., & Guerrero, S. (2015). Study of pulsed light inactivation and growth dynamics during storage of Escherichia coli ATCC 35218, Listeria innocua ATCC 33090, Salmonella Enteritidis MA 44 and Saccharomyces cerevisiae KE 162 and native flora in apple, orange and strawberry juices. International Journal of Food Science & Technology, 50(11), 2498–2507.
Ferrario, M., & Guerrero, S. (2016). Effect of a continuous flow-through pulsed light system combined with ultrasound on microbial survivability, color and sensory shelf life of apple juice. Innovative Food Science & Emerging Technologies, 34, 214–224.
Fine, F., & Gervais, P. (2004). Efficiency of pulsed UV light for microbial decontamination of food powders. Journal of Food Protection, 67(4), 787–792.
Gardner, E. J., Ruxton, C. H. S., & Leeds, A. R. (2007). Black tea–helpful or harmful? A review of the evidence. European Journal of Clinical Nutrition, 61(1), 3–18.
Guner, S. (2012). Effects of Pulsed Ultraviolet Light on the Antioxidants, Phytochemicals, and Microflora Inactivation of Fresh Blueberries (Doctoral dissertation, University of Florida).
Hajiaghaalipour, F., Sanusi, J., & Kanthimathi, M. S. (2016). Temperature and time of steeping affect the antioxidant properties of white, green, and black tea infusions. Journal of Food Science, 81(1), H246–H254.
Hudlikar, R. R., Pai, V., Kumar, R., Thorat, R. A., Kannan, S., Ingle, A. D., Maru, G. B., & Mahimkar, M. B. (2019). Dose-related modulatory effects of polymeric black tea polyphenols (PBPs) on initiation and promotion events in B (a) P and NNK-induced lung carcinogenesis. Nutrition and Cancer, 71(3), 508–523.
Innocente, N., Segat, A., Manzocco, L., Marino, M., Maifreni, M., Bortolomeoli, I., Ignat, A., & Nicoli, M. C. (2014). Effect of pulsed light on total microbial count and alkaline phosphatase activity of raw milk. International Dairy Journal, 39, 108–112.
Jun, X. (2009). Caffeine extraction from green tea leaves assisted by high pressure processing. Journal of Food Engineering, 94(1), 105–109.
Kasim, R., & Kasim, M. U. (2015). Biochemical changes and color properties of fresh-cut green bean (Phaseolus vulgaris L. cv. gina) treated with calcium chloride during storage. Food Science and Technology, 35, 266–272.
Kim, E. S., Liang, Y. R., Jin, J., Sun, Q. F., Lu, J. L., Du, Y. Y., & Lin, C. (2007). Impact of heating on chemical compositions of green tea liquor. Food Chemistry, 103(4), 1263–1267.
Kinugasa, H., & Takeo, T. (1990). Deterioration mechanism for tea infusion aroma by retort pasteurization. Agricultural and Biological Chemistry, 54(10), 2537–2542.
Komatsu, Y., Suematsu, S., Hisanobu, Y., Saigo, H., Matsuda, R., & Hara, K. (1993). Effects of pH and temperature on reaction kinetics of catechins in green tea infusion. Bioscience, Biotechnology, and Biochemistry, 57(6), 907–910.
Krishnamurthy, K., Demirci, A., & Irudayaraj, J. M. (2007). Inactivation of Staphylococcus aureus in milk using flow-through pulsed UV-light treatment system. Journal of Food Science, 72(7), M233–M239.
Kwaw, E., Ma, Y., Tchabo, W., Apaliya, M. T., Sackey, A. S., Wu, M., & Xiao, L. (2018). Impact of ultrasonication and pulsed light treatments on phenolics concentration and antioxidant activities of lactic-acid-fermented mulberry juice. LWT, 92, 61–66.
La Cava, E. L. M., & Sgroppo, S. C. (2019). Combined effect of UV-C light and mild heat on microbial quality and antioxidant capacity of grapefruit juice by flow continuous reactor. Food and Bioprocess Technology, 12(4), 645–653.
Liu, Z., Esveld, E., Vincken, J. P., & Bruins, M. E. (2019). Pulsed electric field as an alternative pre-treatment for drying to enhance polyphenol extraction from fresh tea leaves. Food and Bioprocess Technology, 12(1), 183–192.
Mandal, R., & Pratap-Singh, A. (2021). Characterization of continuous-flow pulsed UV light reactors for processing of liquid foods in annular tube and coiled tube configurations using actinometry and computational fluid dynamics. Journal of Food Engineering, 304, 110590.
Mandal, R., Mohammadi, X., Wiktor, A., Singh, A., & Pratap-Singh, A. (2020). Applications of pulsed light decontamination technology in food processing: An overview. Applied Sciences, 10(10), 3606.
Mandal, R., Singh, A., & Pratap-Singh, A. (2018). Recent developments in cold plasma decontamination technology in the food industry. Trends in Food Science & Technology, 80, 93–103.
Miller, B. M., Sauer, A., & Moraru, C. I. (2012). Inactivation of Escherichia coli in milk and concentrated milk using pulsed-light treatment. Journal of Dairy Science, 95(10), 5597–5603.
Monyethabeng, M. M. (2015). Effect of ultraviolet treatment on shelf life, various spoilage microorganisms and the physicochemical characteristics of rooibos iced tea (Doctoral dissertation, Cape Peninsula University of Technology).
Muñoz, A., Palgan, I., Noci, F., Morgan, D. J., Cronin, D. A., Whyte, P., & Lyng, J. G. (2011). Combinations of high intensity light pulses and thermosonication for the inactivation of Escherichia coli in orange juice. Food Microbiology, 28(6), 1200–1204.
Obanda, M., Owuor, P. O., & Mang’oka, R. (2001). Changes in the chemical and sensory quality parameters of black tea due to variations of fermentation time and temperature. Food Chemistry, 75(4), 395–404.
Orlowska, M., Koutchma, T., Grapperhaus, M., Gallagher, J., Schaefer, R., & Defelice, C. (2013). Continuous and pulsed ultraviolet light for nonthermal treatment of liquid foods. Part 1: effects on quality of fructose solution, apple juice, and milk. Food and Bioprocess Technology, 6(6), 1580–1592.
Pala, Ç. U., & Toklucu, A. K. (2013). Effects of UV-C light processing on some quality characteristics of grape juices. Food and Bioprocess Technology, 6(3), 719–725.
Pataro, G., Muñoz, A., Palgan, I., Noci, F., Ferrari, G., & Lyng, J. G. (2011). Bacterial inactivation in fruit juices using a continuous flow pulsed light (PL) system. Food Research International, 44(6), 1642–1648.
Pratap-Singh, A., & Ramaswamy, H. S. (2016). Simultaneous optimization of heat transfer and reciprocation intensity for thermal processing of liquid particulate mixtures undergoing reciprocating agitation. Innovative Food Science & Emerging Technologies,33, 405-415.
Rasheed, Z. (2019). Molecular evidences of health benefits of drinking black tea. International Journal of Health Sciences, 13(3), 1.
Rawson, A., Patras, A., Tiwari, B. K., Noci, F., Koutchma, T., & Brunton, N. (2011). Effect of thermal and non thermal processing technologies on the bioactive content of exotic fruits and their products: Review of recent advances. Food Research International, 44(7), 1875–1887.
Roy, M. K., Koide, M., Rao, T. P., Okubo, T., Ogasawara, Y., & Juneja, L. R. (2010). ORAC and DPPH assay comparison to assess antioxidant capacity of tea infusions: Relationship between total polyphenol and individual catechin content. International Journal of Food Sciences and Nutrition, 61(2), 109–124.
Sanlier, N., Gokcen, B. B., & Altuğ, M. (2018). Tea consumption and disease correlations. Trends in Food Science & Technology, 78, 95–106.
Singh, B. N., Prateeksha, R., & A. K. S., Bhagat, R. M., & Singh, B. R. (2017). Black tea: Phytochemicals, cancer chemoprevention, and clinical studies. Critical Reviews in Food Science and Nutrition, 57(7), 1394–1410.
Song, Y., Bi, X., Zhou, M., Zhou, Z., Chen, L., Wang, X., & Ma, Y. (2021). Effect of combined treatments of ultrasound and high hydrostatic pressure processing on the physicochemical properties, microbial quality and shelf‐life of cold brew tea. International Journal of Food Science & Technology.
Statista (2021). Volume of tea consumption worldwide from 2012 to 2025. https://www.statista.com/statistics/940102/global-tea-consumption/ (Accessed on 23rd Aug 2021).
Türkoğlu, M., Uğurlu, T., Gedik, G., Yılmaz, A. M., & Yalçin, A. S. (2010). In vivo evaluation of black and green tea dermal products against UV radiation. Drug Discoveries & Therapeutics, 4, 362–367.
Valdivia-Nájar, C. G., Martín-Belloso, O., & Soliva-Fortuny, R. (2018). Impact of pulsed light treatments and storage time on the texture quality of fresh-cut tomatoes. Innovative Food Science & Emerging Technologies, 45, 29–35.
Vergne, M. J., Patras, A., Bhullar, M. S., Shade, L. M., Sasges, M., Rakariyatham, K., Pan, C., & Xiao, H. (2018). UV-C irradiation on the quality of green tea: Effect on catechins, antioxidant activity, and cytotoxicity. Journal of Food Science, 83(5), 1258–1264.
Vollmer, K., Chakraborty, S., Bhalerao, P. P., Carle, R., Frank, J., & Steingass, C. B. (2020). Effect of pulsed light treatment on natural microbiota, enzyme activity, and phytochemical composition of pineapple (Ananas comosus [L.] Merr.) juice. Food and Bioprocess Technology, 13, 1095–1109.
Wiktor, A., Mandal, R., Singh, A., & Pratap Singh, A. (2019). Pulsed Light treatment below a Critical Fluence (3.82 J/cm2) minimizes photo-degradation and browning of a model Phenolic (Gallic Acid) Solution. Foods, 8(9), 380.
Zhao, W., Yang, R., Wang, M., & Lu, R. (2009). Effects of pulsed electric fields on bioactive components, colour and flavour of green tea infusions. International Journal of Food Science & Technology, 44(2), 312–321.
Acknowledgements
Artur Wiktor would like to acknowledge the financial support of the Dekaban Foundation. Authors would like to acknowledge funding support from Natural Sciences and Engineering Research Council of Canada Discovery Grant Programme (Grant# RGPIN-2018-04735 to Anubhav Pratap-Singh) and Collaborative Research & Development Grant Programme (CRDPJ-522364-17 to Anubhav Pratap-Singh) in collaboration with Solaris Disinfection Inc., Mississauga, ON, Canada.
Funding
This research was funded by the National Science and Engineering Research Council of Canada (NSERC) Discovery Grant Number RGPIN-2018–04735 and NSERC Collaborative Research and Development Grant Number CRDPJ-522364–17 in collaboration with Solaris Disinfection Inc., Mississauga, ON, Canada.
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Mandal, R., Wiktor, A., Mohammadi, X. et al. Pulsed UV Light Irradiation Processing of Black Tea Infusions: Effect on Color, Phenolic Content, and Antioxidant Capacity. Food Bioprocess Technol 15, 92–104 (2022). https://doi.org/10.1007/s11947-021-02723-x
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DOI: https://doi.org/10.1007/s11947-021-02723-x