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2022 Journal Impact Factor - 0.6
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ISSN 2083-6473
ISSN 2083-6481 (electronic version)




Associate Editor
Prof. Tomasz Neumann

Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
Equilibrium Moisture Content Importance in Safe Maritime Transport of Black Tea
1 Gdynia Maritime University, Gdynia, Poland
ABSTRACT: In sea transport, a very important thing is an assignment of cargo to a particular class of storage climate conditions and it is carried out on the basis of the requirements that cargo places upon its storage atmosphere. The water content of black tea must not fall below 2%, as the product otherwise becomes hay-like and its essential oils readily volatilize, while on the other hand, it must not exceed 9% as it then has a tendency to grow mould and become musty. Therefore, tea requires particular temperature, humidity/moisture and possibly ventilation conditions. In this context, tea is a hygroscopic material that has the ability to absorb or desorb water in response to temperature and relative humidity of the atmosphere surrounding it. The moisture content of tea is one of the most important variables affecting its chemical and sensory properties. Therefore, to explore and predict the behaviour during transport of tea, its equilibrium moisture content must be determined for a range of transport temperatures and relative humidities. The present paper focuses on the evaluate the hygroscopic properties of tea from Rwanda with different degree of fragmentation based on isotherms of water vapour sorption and characteristics selected parameters of the surface microstructure determining transport conditions and therefor microbiological stability of teas.
BRUNAUER S., EMMET, P.H., TELLER, E., 1938. Adsorption of gases in multilayer’s. Journal of the American Chemical Society, 60, 309-319.
CHIACHUNG, CHEN, YU-KAI, WENG, 2010. Moisture Sorption Isotherms of Oolong Tea, Food Bioprocess Technol, 3, 226–233.
CHI-WEI, CH., SHENG-HUNG, W., MING-YIE, J., WEI-KUNG, W., 2017. Effect of black tea consumption on radial blood pulse spectrum and cognitive health, Complementary Therapies in Medicine 31, 1–7.
CHUNG, K-T., WONG, T.Y., WEI C-I., HUANG, Y-W., LIN, Y., 2010. Tannins and Human Health: A Review, Crit. Rev. Food Sci. Nutr., 998, s. 421-464.
DMOWSKI, P., RUSZKOWSKA, M., 2016. Studies on the hygroscopicity of some black teas in terms of their storage stability, Joint Proceedings, 94, 106-113.
GHODAKE, H.M., GOSWAMI, T.K., CHAKRAVERTY, A., 2007. Moisture sorption isotherms, heat of sorption and vaporization of withered leaves, black and green tea, Journal of Food Engineering, 78, 827–835.
GONDEK E., JAKUBCZYK E., JAŻDZYK B., 2013. Wpływ dodatku błonnika na właściwości sorpcyjne owocowych nadzień cukierniczych. Zeszyty Problemowe Postępów Nauk Rolniczych, nr 573, 23-33.
GÓRECKA D., KORCZAK J., DŁUGOSZ B., HĘS M., 2004. Ocena jakości wybranych herbat różnego pochodzenia. Brom. Chem, Toksykol, 2(37), 145-150.
GRAMZA-MICHAŁOWSKA, A., KOBUS-CISOWSKA J., KMIECIK, D., KORCZAK, J., HELAK, B., DZIEDZIC, K., GÓRECKA, D., 2016. Antioxidative potential, nutritional value and sensory profiles of confectionery fortified with green and yellow tea leaves (Camellia sinensis), Food Chemistry, 211, 448-454.
HARTLEY, I., HAMZA, M.F., 2016. Wood: Moisture Content, Hygroscopicity, and Sorption, Reference Module in Materials Science and Materials Engineering, 2016, Encyclopedia of Materials: Science and Technology (Second Edition), 2001, pp. 9668-9673.
KĘDZIERSKA, K., PAŁACHA, Z., 2011. Wpływ temperatury na właściwości sorpcyjne suszu pieczarek. Acta Agrophysica, 17(1), 77-88.
INTERNATIONAL STANDARD ISO 1573-1980 (E): Tea – Determination of loss in mass at 103°C.
ŁADUNKI OKRĘTOWE. Poradnik encyklopedyczny, 1994. Wyd. PTT Oddział Morski, Sopot (in Polish).
MATHLOUTHI, M., 2001.Water content, water activity, water structure and the stability of foodstuff, Food Control, vol. 12, no. 7, s. 409–417.
OCIECZEK, A., KŁOPOTEK, K., Badania nad higroskopijnością kaw instantyzowanych w aspekcie ich trwałości przechowalniczej, Problemy Higieny i Epidemiologii, 2013. vol. 94, nr 4, s. 879–882.
PADEREWSKI, M., 1999. Procesy adsorpcyjne w inżynierii chemicznej. WNT, Warszawa.
SHARNOW, R., 2000, Ładunkoznawstwo okrętowe, Wyd. WSM w Gdyni, Gdynia (in Polish).
SINIJA, V.R., MISHRA, H.N., 2008. Moisture sorption isotherms and heat of sorption of instant (soluble) green tea powder and green tea granules, Journal of Food Engineering, 86, 494–500.
TEMPLE, S. J., B. VAN BOXTEL, A. J., 1999. Equilibrium Moisture Content of Tea, J. agric. Engng Res., 74, 83-89.
WANG, H., HELLIWELL, K., 2000. Epimerisation of catechins in green tea infusion. Food Chemistry,70, 337, 344. (access 16.04.2018 r.)
Citation note:
Dmowski P., Ruszkowska M.: Equilibrium Moisture Content Importance in Safe Maritime Transport of Black Tea. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 12, No. 2, doi:10.12716/1001.12.02.22, pp. 399-404, 2018
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