Benders'dictionary of nutrition and food technology

246permits determination of the connective tissue content of theproducthydroxyproline index The ratio of urinary hydroxyproline: creatinine/kgbody weight; low in malnourished children.5-hydroxytryptamine (5HT) Also called serotonin. A neurotransmitteramine synthesised from the amino acid tryptophan,also formed in blood platelets; it acts as a vasoconstrictor. Foundin plantains and some other foods, but metabolised in theintestinal mucosa by monoamine oxidase.Hyfoama TM Hydrolysed milk and wheat protein used to preparestable foams for confectionery manufacture that, unlike eggalbumin foams, do not denature and cannot be overwhipped.hygrometer Instrument for measuring humidity and/or wateractivity. Also known as a psychrometer.hygroscopic Readily absorbing water, as when table salt becomesdamp. Materials such as calcium chloride and silica gel absorbwater very readily and are used as drying agents. Hygroscopicfoods are those in which the partial pressure of water vapourvaries with the moisture content, so that they take up moisturefrom the atmosphere.Hy-Lite TM See bioluminescence.hyoscine See atropine.hyperalimentation Provision of unusually large amounts ofenergy, either intravenously (parenteral nutrition) or by nasogastrictube or gastrostostomy tube (see enteral nutrition).hyperammonaemia High blood ammonia concentration (normal