Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing compound containing a...
Reexamination Certificate
2006-08-08
2006-08-08
Saucier, Sandra E. (Department: 1651)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing compound containing a...
C435S134000
Reexamination Certificate
active
07087402
ABSTRACT:
The present invention is related to a process for selectively transesterifying stanols in mixtures comprising sterols and stanols, and a process for separating sterols from said mixtures.The process of selective transesterification comprises the forming of a reacting mixture by contacting a selective lipase with a reactant mixture comprising sterols and stanols and an ester selected from the group consisting of esters of an organic acid with a short chain aliphatic alcohol. The transetrifying is carried out agitated reactors at pressures below atmospheric pressure and temperatures from 30 to 90° C.The process for separating a fraction comprising sterols from a mixture comprising sterols and stanols comprises the steps:a) forming a reactive mixture by contacting a selective lipase with a reactant mixture comprising sterols and stanols and an ester selected from the group consisting of esters of an organic acid with a short chain aliphatic alcohol;b) forming a reacted mixture by separating the selective lipase from the reacting; andc) separating from the reacted mixture a fraction comprising sterolsThe reaction is carried out in agitated reactors at pressures below atmospheric pressure and temperatures from 30 to 90° C.Recovering from the reacted mixture of a fraction comprising sterols comprise one or more distillation steps at reduced pressure or one or more distillation and crystallization steps.
REFERENCES:
patent: 6660491 (2003-12-01), Norinobu et al.
Weber et al., “Fatty Acid Steryl, Stanyl, and Steriod Esters by Esterification and Transesterification in Vacuo UsingCandida rugosaLipase as Catalyst”, J. Agric. Food Chem. 2001, 49:67-71 (Nov. 8, 2000).
King et al., “Sterol ester production using lipase-catalyzed reactions in supercritical carbon dioxide”, Eur. Food Res. Technol. (2001) 212:566-569 (Mar. 29, 2001).
Basterrechea Irene Martinez
Diaz Miguel Angel Fuenzalida
Markovits Rojas Alejandro
Markovits Schersl Endre
Baker & McKenzie LLP
Harting, S.A.
Saucier Sandra E.
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