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- W1126382911 abstract "The colloidal p recipitate known as tea cream, which separates when a hot aqueous infusion of black tea is cooled, is inves tigated by electron microscopic (EM) techniques of shadowing, sectioning, freeze-etching and scanning and also by optical microscopy. These indicate tea cream to be an association colloid, the morphology of which depends on overall solids concentration. Dilute infusions (0.1% w/w) produce macromolecular aggregates of about 50 run, but at higher tea solids concent rations secondary aggregation of the initial particles results in ill-defined clus te r s of approximately 1 ~ in diamete r. At 5% w/w, clear , spherical liquid droplet s, typically 1-2 ~ in diameter are observed . Increasing concentration to 40% w/ w causes an increase in s ize of the individual colloidal droplets and an increase in the phase volume of this disperse phase. The colloidal phase contains 55 65% solids by weight, the tota l solids content appearing t o be independent of overall composit i on of the solutions from which it is fo rmed. The colloid may be separated from cooled tea infusions by centrifugation but individual particles display strong resistance to coalescence. At high tea cream phase volumes phase inversion can occur and dispersions of the dilute phase in a contim,1ous cream phase are then observed. Initial paper received February 10, 1986 Manuscrip t received March 27, 1987 Direct inquiries to R.D. Bee Telephone number: 44-234-781781x2247" @default.
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- W1126382911 date "1987-01-01" @default.
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- W1126382911 title "The Morphology of Black Tea Cream" @default.
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