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Study of nutritional value of dried tea leaves and infusions of black, green and white teas from Chinese plantations

100%

Czernicka M., Zagula G., Bajcar M., Saletnik B., Puchalski C.

Roczniki Państwowego Zakładu Higieny

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2017

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tom 68

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nr 3

Background. The processing of tea leaves determines the contents of bioactive ingredients, hence it should be expected that each variety of tea, black, red or green, will represent a different package of compounds of physiological importance. Taste and aroma, as well as price and brand are the main factors impacting consumers’ preferences with regard to tea of their choice; on the other hand consumers less frequently pay attention to the chemical composition and nutritional value of tea. Objective. The purpose of the study was assessment of the nutritional value of black, green and white high-quality tea leaf from Chinese plantations based on the chemical composition of the dried leaves as well as minerals and caffeine content in tea infusions. Material and methods. The research material included 18 high-quality loose-leaf teas produced at Chinese plantations, imported to Poland, and purchased in an online store. The analyses included examination of the dried tea leaves for their chemical composition (contents of water, protein, volatile substances and ash) and assessment of selected minerals and caffeine contents in the tea infusions. Results. High-quality Chinese green teas were found with the most valuable composition of minerals, i.e. the highest contents of Zn, Mn, Mg, K, Ca and Al and the highest contents of protein in comparison to the other products. Chinese black teas had the highest contents of total ash and caffeine and white teas were characterized with high content of volatile substances, similar to the black teas, and the highest content of water and the lowest content of total ash. Conclusions. The three types of tea brews examined in the present study, in particular green tea beverages, significantly enhance the organism’s mineral balance by providing valuable elements.

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Określenie wartości zdrowotnej suszu i naparów wysokogatunkowych herbat czarnych pochodzących z różnych rejonów upraw

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Czernicka M., Zagula G., Bajcar M., Saletnik B., Puchalski C.

Bromatologia i Chemia Toksykologiczna

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2016

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tom 49

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nr 2

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Assessment of the nutritional value of high quality fruit influsions based on the content of bioelements and toxic metals

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Czernicka M., Zagula G., Bajcar M., Saletnik B., Puchalski C.

Journal of Elementology

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2018

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tom 23

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nr 3

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Effect of infusion time and addition of lemon juice on the mobility of selected macroelements and aluminium during aqueous extraction of quality brands of leaf tea

86%

Saletnik B., Zagula G., Grabek-Lejko D., Kasprzyk I., Bajcar M., Czernicka M., Puchalski C.

Journal of Elementology

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2018

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tom 23

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nr 2

Ograniczanie wyników

2 Journal of Elementology

1 Bromatologia i Chemia Toksykologiczna

1 Roczniki Państwowego Zakładu Higieny

4 Bajcar M.

4 Czernicka M.

4 Puchalski C.

4 Saletnik B.

4 Zagula G.

1 Grabek-Lejko D.

1 Kasprzyk I.

2 2018

1 2017

1 2016

Study of nutritional value of dried tea leaves and infusions of black, green and white teas from Chinese plantations

Określenie wartości zdrowotnej suszu i naparów wysokogatunkowych herbat czarnych pochodzących z różnych rejonów upraw

Assessment of the nutritional value of high quality fruit influsions based on the content of bioelements and toxic metals

Effect of infusion time and addition of lemon juice on the mobility of selected macroelements and aluminium during aqueous extraction of quality brands of leaf tea