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(11)Patent No :AP 2550(73) Applicant(s)

(21)Application No :AP/P/2007/004199CSIR, Building S3, Ardeer Road, 1645 Modderfontein,

South Africa

 

(22)Filing Date :13.03.2006

(24)Date of Grant &31.12.2012

 

(45)Publication : 

 

(30)  Priority Data(72) Inventors

 

(33) Country(31) Number(32) DateSTEENKAMP Lucia, Hendrina, South Africa

ZA2005/0231018.03.2005MITRA Robin Kumar, South Africa

ZA2005/0230818.03.2005

HEGGIE Steven James, South Africa

 

et al

(74) Representative

(84)Designated State

 

BWGMGHKELSMWMZ   NA   SLHONEY & BLANCKENBERG

SDSZT ZUGZMZW

(51)InternationalClassificationC07D 311/22 (2006.01)

(54)Title 

 

Method for converting aloeresin a to aloesin 

 

(57)Abstract 

 

The invention provides a process for hydrolytically converting aloeresin A to aloesin by the following reaction: The amount of aloesin available for extraction from sap of aloe plants is thereby increased and the extraction and purification of the aloesin is also made easier and less costly. As aloesin is more commercially valuable than aloeresin A, the process also increases the commercial value of the sap or aloe bitters from the aloe plant. The process optionally also includes the step of separating the aloesin from the 

 

p-coumaric 

 

acid. Typical hydrolysis steps that are used in the process are acid hydrolysis, base hydrolysis and enzymatic hydrolysis. In the case of acid hydrolysis, the acid is any suitable organic or inorganic acid, such as hydrochloric acid, sulfuric acid, nitric acid or phosphoric acid. In the case of enzymatic hydrolysis, the hydrolytic enzyme is typically an esterase, a lipase or a 

 

(56)Documents Cited :P. GRAMATICA D MONTI G SPERANZA AND P MANITTO    OING-MING CHE, TERUAKI AKAO,

 

MASAO HATTORI, KYOICHI KOBASHI TSUNEO NAMBA

 

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