Method for preparing iodine-doped TiO2 nano-catalyst and use thereof in heterogeneously catalyzing configuration transformation of trans-carotenoids

Patent metadata

Field	Value
Publication number	US-9656250-B2
Application number	US-201514617945-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Dec 5, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The present invention relates to a method for preparing an iodine-doped TiO 2 nano-catalyst and use of the catalyst in heterogeneously catalyzing configuration transformation of trans-carotenoids. The iodine-doped TiO 2 nano-catalyst is prepared by a sol-gel process using a titanate ester as a precursor and an iodine-containing compound as a dopant in the presence of a diluent, inhibitor and complexing agent. The catalyst exhibits high activity for isomerization of the trans-carotenoids into their cis-isomers within a short catalytic time. The catalyst can be easily prepared and is highly efficient, economical, recyclable and environmentally friendly.

First claim

What is claimed is:

1. The method of using an iodine-doped TiO 2 nano-catalyst in heterogeneously catalyzing configuration transformation of trans-carotenoids into their cis-isomers, the method comprising:
dissolving trans-lycopenes or β-carotenes in ethyl acetate;
adding a predetermined amount of said iodine-doped TiO 2 nano-catalyst;
heating to refluxing in darkness for a fixed period of time to form a mixture;
cooling the mixture to a room temperature;
centrifuging the mixture to isolate the catalyst; and
evaporating the solution under vacuum to remove ethyl acetate to form a reside product lycopene or β-carotene with a high proportion of cis-configuration.

2. The method of using the iodine-doped nano-catalyst in heterogeneously catalyzing configuration transformation of trans-carotenoids according to claim 1 , wherein, the method is used for catalytic isomerization of lycopene to form the reside product having 19.28% 5-cis-lycopene.

3. The method of using the iodine-doped TiO 2 nano-catalyst in heterogeneously catalyzing configuration transformation of trans-carotenoids according to claim 1 , wherein, the method is used for catalytic isomerization of β-carotene to form the reside product having 21.33% 9-cis-β-carotene.

Assignees

• Univ Jiangnan

Inventors

• Zhang Lianfu
• Sun Qingrui
• Yan Hongxiao

Classifications

• B01J35/45

  Nanoparticles · CPC title

• C07C403/24

  having side-chains substituted by six-membered non-aromatic rings, e.g. beta-carotene · CPC title

• B01J27/135 Primary

  with titanium, zirconium, hafnium, germanium, tin or lead · CPC title

• C07C2527/135

  Compounds comprising a halogen and titanum, zirconium, hafnium, germanium, tin or lead · CPC title

• C07C403/00

  Derivatives of cyclohexane or of a cyclohexene {or of cyclohexadiene}, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene {or cyclohexadiene} rings, e.g. vitamin A, beta-carotene, beta-ionone · CPC title