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Its leaves are a common edible vegetable consumed either fresh, or after storage using preservation techniques by canning, freezing, or dehydration. It may be eaten cooked or raw, and the taste differs considerably; the high oxalate content may be reduced by steaming. It is an annual plant (rarely biennial), growing as tall as 30 cm (1 ft).
Taste detection threshold is the minimum concentration of a flavoured substance detectable by the sense of taste. Sweetness detection thresholds are usually measured relative to that of sucrose , sourness relative to dilute hydrochloric acid , saltiness relative to table salt ( NaCl ), and bitterness to quinine . [ 1 ]
Precut or prewashed greens won't survive safely at room temperature for much longer than two hours (and will wilt if placed directly in the sun); raw spinach, kale, or romaine lettuce are only ...
Organoleptic tests are sometimes conducted to determine if food or pharmaceutical products can transfer tastes or odors to the materials and components they are packaged in. Shelf-life studies often use taste, sight, and smell (in addition to food chemistry and toxicology tests) to determine whether a food product is safe to consume.
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The PTC taste test has been widely used in school and college practical teaching as an example of Mendelian polymorphism in human populations. Based on a taste test, usually of a piece of paper soaked in PTC (or the less toxic propylthiouracil (PROP)), students are divided into taster and non-taster groups.
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