Tissa Amarakoon

University of Kelaniya · Faculty of Science

Tea, derived from the leaves and buds of the shrub Camellia sinensis, is one of the world's most popular beverages owing to its unique flavour, aroma, and therapeutic properties. Due to the tendency for heavy metal accumulation in the plant, processed tea needs to be analyzed frequently to ensure its adherence to maximum limits in international sta...

The quality of made tea is largely dependent on the key metabolites viz. caffeine and flavan-3-ols. The aim of the present study was to quantify flavan-3-ols and caffeine of Sri Lankan exotic tea germplam. Fresh leaf flavan-3-ols; catechin (+C), epicatechin (EC), epicatechingallate (ECg), epigallocatechin (EGC) and epigallocatechingallate (EGCg), c...

Tea (Camellia sinensis (L.) Kuntze) is a species of evergreen tree and it is one of the most popular nonalcoholic natural beverages, worldwide. Tea production is vulnerable to the effects of predicted climate change and breeding for superior genotypes that have better stress tolerance. Transcription factor genes have been successfully used to devel...

Tea [Camellia sinensis (L.) O. Kuntze], the second most consumed beverage in the world, is a rich source of polyphenolic compounds. The characteristic properties of tea depend on the biochemical compounds present in tea leaf. Hybridization of tea aims at developing new cultivars with more favorable levels of biochemicals for commercial exploitation...

The tea plant [Camellia sinensis (L.) O. Kuntze] is one of the most popular non-alcoholic beverage crops worldwide. Tea germplasm is the most valuable and fundamental resource for breeding high yielding, climate resilient, and quality tea cultivars. Therefore, efforts were made to characterize the existing genetic diversity of Sri Lankan tea using...

Objectives- Theanine is a non-protein-forming amino acid found in tea. Our previous work indicates high doses of theanine to have positive effects on selective attention in doses equivalent those of caffeine 1 , with less adverse effects. Our objective was to determine the presence of a dose-response effect of theanine on three aspects of attention...

Tea is produced from the plant species Camellia sinensis. Blister blight is a major leaf disease caused by the fungus Exobasidiumvexans in tea resulting in significant yield losses, debilitation and death of tea bushes.Copper and systemic fungicides are currently used to control the disease resulting in high costs and potential residues in tea. In...

Food fraud is a concern for the producers of high-quality food products as it causes brand damage and loss of profit. Tea (Camellia sinensis L.) is one of the major agricultural products of Sri Lanka and accounts for more than 300 million of kilograms per year, roughly 2% of the national GDP. Trace metals and stable isotope ratios in tea samples or...

Objective: l-theanine is a constituent of tea which is claimed to enhance cognitive functions. We aimed to determine whether theanine and theanine-caffeine combination have acute positive effects on cognitive and neurophysiological measures of attention, compared to caffeine (a positive control) and a placebo in healthy individuals. Design: In a...

Two major types of tea, ―green tea‖ and ―black tea‖ are produced from the young shoots of Camellia sinensis L. employing different processing methods. Sri Lanka traditionally produces black tea and the existing cultivars are more suitable for black tea production. However, due to the increased demand for green tea in certain countries, it could be...

Effects of dhool (particles resulting from rolling of green leaf) fermented for varying durations, black tea and the rejected fraction in black tea manufacture which is known as ‘broken mixed fannings’ (BMF) as raw materials on the physicochemical and organoleptic properties of instant black tea were studied. Total polyphenols and theaflavins conte...

No: 260 (Poster) Food, Nutrition and Livestock In conventional instant tea manufacture, tea extract is concentrated to about 25 Brix by thermal evaporation before spray drying. Most of the organoleptic properties are destroyed at this stage. This study was undertaken to investigate the possibility of improving the quality of instant black tea by me...

ETHNOPHARMCOLOGICAL RELEVANCE: Sri Lankan traditional practitioners recommend the consumption of black tea infusion (BTI) made from Camellia sinensis L. plant for regulation of glycaemia. However, they do not specify the grade of tea and their origin (i.e., agroclimatic elevation) and as such many prediabetics and milddiabetics use BOPF grade tea....

Black tea [Camellia sinensis (L.) O. Kuntze (family: Theaceae)] has been used by Sri Lankan traditional practitioners to promote diuresis. However, the type and grade of tea is not specified. THIS STUDY INVESTIGATES THE DIURETIC ACTIVITY OF BLACK TEA INFUSION (BTI) IN RATS USING BROKEN ORANGE PEKOE FANNINGS (BOPF) GRADE FROM MAJOR AGROCLIMATIC ELEV...

The polyphenols catechins and theaflavins in black tea have been shown to possess many medicinal properties, including anticancer activity and some antifungal characteristics, but there have been few studies of their anti-Candida activity. In this paper we report the results of our study of the anti-Candida activity of tea polyphenols. The effects...

Studies were performed to investigate the effect of a polyphenol rich extract from black tea and vitamin E on bacterial lipopolysaccharide (endotoxin) induced IL-6 production, alterations in liver glutathione and antioxidant acute phase protein (caeruloplasmin) concentration, in rats fed on a synthetic diet for 21 days. In the vitamin E sufficient...

Thesis (Ph. D.)--University of Southampton, 1997.