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Process for preparing microcapsules having gelatin walls crosslinked with quinone Process for preparing microcapsules having gelatin walls crosslinked with quinone A process for conveniently producing microcapsules containing a gelatin wall crosslinked with quinone and a core of an active compound such as a fouling reducing agent, particularly a tributyl tin chloride, involves use of a simple or complex coacervation technique. The quinone crosslinking provides microcapsules of excellent strength, storage stability, and resistance to aqueous exposure, such that the rate of release of the fouling reducing agent can be controlled with precision.
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Thermal stability of selected natural red extracts used as food colorants. Thermal stability of selected natural red extracts used as food colorants. The color degradation of aqueous solutions of six natural red pigment extracts (elderberry, red cabbage, hibiscus, red beet, Opuntia fruits and red cochineal) used commercially as food colorants was investigated at temperatures between 50 and 90 掳C. Color degradation was studied in respect to both spectral properties and visual color. The remaining absorbance at 535 nm as a function of the incubation time and temperature was used to quantify the degradation process. Red cochineal was the most thermoresistant extract with a remaining absorbance of 95 % after 6 h at 90 掳C. Anthocyanin extracts (elderberry, red cabbage, hibiscus) showed remaining absorbance percentages of 63.8, 46.1 and 26.7, respectively. Betacyanin extracts (red beet, Opuntia fruits) were the most thermosensitive maintaining only 12.5 and 1.7 %, respectively, of the initial absorbance at 535 nm. Applying a first-order kinetic model to the degradation processes, reaction rate constants (k) and half-life periods (t 1/2 ) were calculated. The temperature dependence of the degradation rate constant obeyed the Arrhenius relationship, with activation energies (E a ) ranging between 3.02 and 53.37 kJ mol(-1). The higher activation energy values indicated greater temperature sensitivity. Changes in visual color attributes corroborated the high thermal stability of the red cochineal extract.
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"A New Risk of Using Alkaline Drops in Patients With Laryngopharyngeal Reflux. A New Risk of Using A(...TRUNCATED) |
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"BERTRAND RUSSELL\r\nMYSTICISM AND\r\n\r\nLOGIC\r\nAND OTHER ESSAYS\r\n\r\n\r\nLONDON\r\n\r\nGEORGE (...TRUNCATED) | "Project Gutenberg english {\"language\": \"en\", \"text_id\": 25447, \"title\": \"Mysticism and Log(...TRUNCATED) | false |
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"Bergamot Essential Oil: A Method for Introducing It in Solid Dosage Forms Bergamot Essential Oil: A(...TRUNCATED) |
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