| Word | Description |
| Ubi-chromenol | Cyclised form of ubiquinone. |
| Ubiquinones | Refers to a number of derivatives of benzoquinone with 6-10 isoprene side-chains. They are widely distributed in nature; function as part of the respiratory chain. Also known as coenzyme O6-O10, and as mitoquinones. |
| Ugli | Citrus fruit, cross between grapefruit and tangerine. |
| UHTS | Ultra high temperature sterilisation. |
| Ullage | Liquid which is left in cask or bottle after some has been removed or lost through defective container. |
| Ultracentrifuge | Centrifuge which is operating at very high speeds; will separate particles of different size in a colloidal suspension. Used to separate the different fractions of cells. Ultracentrifuged milk is treated for a few seconds at 15000-16000 rev / min, when |
| Ultrafiltration | Refers to a pressure -driven membrane process which is similar to reverse osmosis but using a more open membrane. It allows inorganic salts and small molecules to pass through with the water and holds back only the larger molecules. Used to separate mat |
| Ultra High Temperature Sterilisation (UHT) | Term used in milk industry for continuous sterilisation carried out at temperatures above 135ºC i.e., in the upper part of HTST / (high temperature short time) range, followed by filling aseptically into the container. |
| Ultrasonic Homogeniser | Refers to super-high-speed vibrator giving a cavitation force of to tones per square inch in the liquid. It is used to cream soups. Disperse dried milk, disperse essential oils in soft drinks, stabilise tomator puree, prepare peanut butter, etc. |
| Ultraviolet Irradiation | Lethal to bacteria 9wavelenth 2900-2100 Angstrom units). It is only of value for surface sterilisation or sterilising the air. Also used for tenderising and aging of meatm curing cheese, and prevention of mould growth on the surface of backery products. |
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