Proximate, Phytochemical and Antioxidant Mineral Compositions of Four Different Brands of Tea

Abstract

The comparative studies of the proximate, phytochemical and antioxidant mineral compositions of four different brands of green tea were investigated. The four different brands, Tianshi®, Qualitea®, Slimfit®, and Xiang® were purchased from a supermarket in Ihiala Local Government Area of Anambra State, Nigeria. The samples were pulverized and stored in an airtight container prior to analysis. The proximate composition was analysed using AOAC method while phytochemical compositions of the green teas were investigated using standard methods. The result of the study indicated that the moisture content (15.80±0.01%) and protein content (1.05±0.00%) of Qualitea® was significantly higher (P<0.05) compared to Slimfit and Xiang tea while the fibre content of Xiang tea (80.35±0.03%) was significantly higher (P<0.05) than other tea studied. The phytochemical study showed the presence of flavonoids, tannins, alkaloids, saponins and cardiac glycosides in all the teas studied. However, Qualitea® contains the highest amount of phytochemicals when compared to the other brands of tea investigated. Data obtained from the antioxidant mineral study showed that the four brands of the tea are good sources of antioxidant minerals such as Fe, Zn, Cu, Mn and Se. It is therefore recommended that tea be included in our menu because of their nutritive and health benefits.

Comparative Analysis of Seasonal Changes in Soil Contaminations from Polycyclic Aromatic Hydrocarbons at Solid Waste Dumpsites in Port Harcourt, Nigeria

“…The concentration of PAHs in all dumpsites during rainy and dry seasons, indicates that high molecular weight (HMWPAHs) Chrysene, Benzo(b)fluoranthene, Benzo (k) fluoranthene, Indeno(1,2,3cd) pyrene, Diabenez(a,h)anthracene which are highly toxic and cancerous are more in dumpsite located around the residential arears during rainy season while they are predominant in Market dumpsites during dry season. The predominance of HMWPAHs at all the dumpsites in this study also agrees with the work of Ifemeje [5], on Ibadan municipal dumpsites.…”

“…Ifemeje [5] studied distribution of polycyclic aromatic hydrocarbons (PAHs) in soils from Onitsha municipal active and dormant solid waste dumpsites. The study showed that Low molecular weight PAHs were not detected in both active and dormant dumpsite.…”

Influence of Different Processing Conditions on Nutritional, Phytochemical, and Physical Properties of Aquatic Fern (Azolla pinnata): A Sustainable Nutrient-Rich Human Food

“…Furthermore, acid and alkali treatments showed an increase in the alkaloid content by 5.90 and 6.56%, respectively, while microwave treatments exhibited no effect on alkaloid content. The concentration of alkaloids in edible plants is generally nontoxic because boiling or steaming reduces their levels in plant extracts . Hydrothermal treatments such as blanching and autoclaving result in a higher reduction of antinutrients owing to the water-soluble nature of the minerals as they are leached to the cooking medium .…”

“…The concentration of alkaloids in edible plants is generally nontoxic because boiling or steaming reduces their levels in plant extracts. 45 Hydrothermal treatments such as blanching and autoclaving result in a higher reduction of antinutrients owing to the water-soluble nature of the minerals as they are leached to the cooking medium. 12 Furthermore, during various thermal and hydrothermal treatments, antinutrients such as phytates form insoluble complexes with proteins and minerals, which may also be responsible for lower levels.…”

Evaluation of in vitro antioxidant activities of selected commercial tea brands

“…These components act synergistically to ensure a desired beneficial effect (Raederstorff et al, 2003). Tea are rich in proteins, carbohydrates, minerals and trace elements, lipids, vitamins, carotenoids, flavonoids and volatile compounds (Graham, 1992;Belitz and Grosch, 1997;Ifemeje et al, 2020). However, most of the tea brands used in this study do not contain sugars, fat, fiber or sodium, with considerable amount of energy and low proteins in their nutritional information.…”