Hot lemon

Hot lemon is a hot drink made from water, lemon juice and possibly sugar or honey . Due to its high vitamin C content, it is a popular home remedy for colds . The drink is made with about one lemon per glass and can be sweetened to reduce the high acidity.

Although vitamin C only decomposes at 190 ° C, it oxidizes in aqueous solution to dehydroascorbic acid , which, depending on the reaction conditions, irreversibly hydrolyzes to diketogulonic acid . The oxidation of vitamin C is accelerated by increasing the temperature, which is why the drink is usually prepared at a temperature of around 60 ° C.

Individual evidence

↑ Braulio Gómez Ruiz, Stéphanie Roux, Francis Courtois, Catherine Bonazzi: Kinetic modeling of ascorbic and dehydroascorbic acids concentrations in a model solution at different temperatures and oxygen contents . In: Food Research International . tape 106 , April 1, 2018, ISSN 0963-9969 , p. 901–908 , doi : 10.1016 / j.foodres.2018.01.051 ( sciencedirect.com [accessed February 8, 2019]).

[1] Braulio Gómez Ruiz, Stéphanie Roux, Francis Courtois, Catherine Bonazzi: Kinetic modeling of ascorbic and dehydroascorbic acids concentrations in a model solution at different temperatures and oxygen contents . In: Food Research International . tape 106 , April 1, 2018, ISSN 0963-9969 , p. 901–908 , doi : 10.1016 / j.foodres.2018.01.051 ( sciencedirect.com [accessed February 8, 2019]).