Document Detail

Chemical composition, plant secondary metabolites and minerals of green and black teas and the effect of different tea-to-water ratios during their extraction on the composition of their spent leaves as potential additives for ruminants.
MedLine Citation:
PMID:  23621359     Owner:  NLM     Status:  Publisher    
This study characterized the chemical composition of green and black teas as well as their spent tea leaves (STL) following boiling in water with different tea-to-water ratios. The green and black tea leaves had statistically similar (g/kg DM, unless stated otherwise) DM (937 vs 942 g/kg sample), crude protein (240 vs 242) and ash (61.8 vs 61.4) but green tea had significantly higher (g/kg DM) total phenols (231 vs 151), total tannins (204 vs 133), condensed tannins (176 vs 101), total saponins (276 vs 86.1) and lower neutral detergent fibre (254 vs 323) and acid detergent fibre (211 vs 309) than the black tea leaves. There was no significant difference between the green and black tea leaves for most mineral components except Mn, which was significantly higher in green tea leaves, and Na and Cu which were significantly higher in black tea leaves. A higher tea-to-water ratio during extraction significantly reduced the loss of soluble compounds into water and hence yielded a more nutrient-rich STL. Based on these analyses it appears that the green and black tea leaves alongside their STL have the potential for use as sources of protein, fibre, secondary metabolites and minerals in ruminant diets. The presence of high levels of plant secondary metabolites in either tea leaves or their STL suggests that they may have the potential for their use as natural additives in ruminant diets.
Diky Ramdani; Abdul Shakoor Chaudhry; Chris J Seal
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-4-29
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-4-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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