Methods for the selective extraction of unsaponifiable matters from renewable raw materials by solid-liquid extraction in the presence of a cosolvent

A method for extracting an unsaponifiable fraction from a solid new raw material comprising fats, especially lipids, functionalized with one or more function(s) chosen from hydroxyl, epoxide, ketone, thiol, aldehyde, ether and amine functions, comprising the following steps:

• a) solid-liquid extraction of the fats from said solid renewable raw material optionally dehydrated and/or optionally conditioned in the presence of at least one polar organic solvent and at least one non-polar cosolvent immiscible with said polar organic solvent, resulting in the formation of a polar organic phase enriched in lipids functionalized with one or more function(s) chosen from hydroxyl, epoxide, ketone, thiol, aldehyde, ether and amine functions,
• b) concentration of the polar organic phase so as to obtain a mixture enriched in unsaponifiable fraction, and optionally comprising the following steps:
• c) saponification of the mixture enriched in unsaponifiable fraction,
• d) extraction of the unsaponifiable fraction from the saponified mixture,
• wherein said renewable raw material undergoes optionally a heat treatment at a temperature higher than or equal to 75° C., preferably higher than or equal to 80° C., after step a).

A method for extracting an unsaponifiable fraction from a solid renewable raw material containing fats, comprising the following steps:

• a) solid-liquid extraction of the fats from said solid renewable raw material optionally dehydrated and/or optionally conditioned in the presence of at least one polar organic solvent and at least one non-polar cosolvent immiscible with said polar organic solvent, resulting in the formation of a non-polar organic phase enriched in lipids containing no or few hydroxyl, epoxide, ketone, thiol, aldehyde, ether and amine function(s),
• b) concentration of the non-polar organic phase so as to obtain a mixture enriched in unsaponifiable fraction, and optionally comprising the following steps:
• c) saponification of the mixture enriched in unsaponifiable fraction,
• d) extraction of the unsaponifiable fraction from the saponified mixture,
• wherein said renewable raw material undergoes optionally a heat treatment at a temperature higher than or equal to 75° C., preferably higher than or equal to 80° C., before step a).