The lemon (Citrus × limon) is a hybrid in cultivated wild plants. It is the common name for the reproductive tissue surrounding the seed of the angiosperm lemon tree. The lemon is used for culinary and nonculinary purposes throughout the world. The fruit is used primarily for its juice, though the pulp and rind (zest) are also used, primarily in cooking and baking. Lemon juice is about 5% (approximately 0.03 moles/Liter) citric acid, which gives lemons a tart taste, and a pH of 2 to 3. This makes lemon juice an inexpensive, readily available acid for use in educational science experiments.

History

In 1747, James Lind's experiments on seamen suffering from scurvy involved adding Vitamin C to their diets through lemon juice.Case 3: Naval Medicine: The Fight Against Scurvy @ King's College at London. Information on this site is based from: James Lind. A treatise on the scurvy. Second edition. London: printed for A. Millar, 1757. Thomas's Historical Collection 28.b.9.

The name lemon was originated from Arabic līmūn لیمون and Persian limun through Old Italian and Old French limone.

Culinary uses

Fish are marinated in lemon juice to neutralize the odor. The acid neutralizes the amines in fish by converting them into nonvolatile ammonium salts.

Lemon juice, alone or in combination with other ingredients, is used to marinate meat before cooking: the acid provided by the juice partially hydrolyzes the tough collagen fibers in the meat (tenderizing the meat), though the juice does not have any antibiotic effects.

Lemons, alone or with oranges, are used to make marmalade. The grated rind of the lemon, called lemon zest, is used to add flavor to baked goods, puddings, rice and other dishes. Pickled lemons are a Moroccan delicacy. A liqueur called limoncello is made from lemon rind.

When lemon juice is sprinkled on certain foods that tend to oxidize and turn brown after being sliced, such as apples, bananas and avocados, the acid acts as a short-term preservative by denaturing the enzymes that cause browning and degradation.

Non-culinary uses