modified Horeau method. Chiroptical correlation of plectaniaxanthin acetonide and (2′S)-16′, 17′-dinorplectaniaxanthin acetonide was taken as proof of 2′R chirality for natural plectaniaxanthin and its mono- and diesters. The synthesis of the chiral model carotenoid was effected from d -mannitol via 2, 3-O-isopropylidene- d -glyceraldehyde as key synthon.
New carotenoids of the formula ##STR1## wherein R and n have the significances given herein, are useful for pigmenting the egg yolk, integuments and/or subcutaneous fat of poultry and the meat and/or integuments of fish and crustacea when included in the feed of the poultry, fish or crustacea. As well as such carotenoids and method of pigmenting the invention further embraces the pertinent carotenoid-enriched feed for poultry, fish or crustacea, the premixes for incorporation in such feeds and beadlets containing one or more of these carotenoids for incorporation in such premixes and the use of the carotenoids in the pigmenting method. The process of manufacturing such carotenoids, which more specifically may be designated as carotenoid ketones, monoesters and diesters, also represents an aspect of the invention.
[EN] STABLE FORMULATIONS FOR COLORING BEVERAGES AND FOOD PRODUCTS<br/>[FR] FORMULATIONS STABLES POUR COLORER DES BOISSONS ET DES PRODUITS ALIMENTAIRES
申请人:DSM IP ASSETS BV
公开号:WO2015044222A1
公开(公告)日:2015-04-02
The present invention is directed to stable formulations comprising 2'-dehydro-plectaniaxanthin embedded in a matrix of modified food starch, to their manufacturing process as well as to the use of such formulations for coloring, enriching or fortifying beverages and food products and such beverages and food products which show an orange to red color.
Total synthesis of myxol and deoxymyxol stereoisomers and their application to determining the absolute configurations of the natural products
total synthesis of myxol stereoisomers 1a,b and deoxymyxol (plectaniaxanthin) stereoisomers 2a,b was accomplished by Wittig reaction of (S)- and (R)-C10-phosphonium salts 8a,b bearing a silyl-protected 1,2-dihydroxy-ψ end group with C30-apocarotenals 6 and 7. The phosphonium salts 8a,b were derived from aldehydes 11a,b possessing a cyclopentylidene ketal moiety, prepared via Sharpless asymmetric epoxidation