1
W Geoffrey Haigh: High purity beta-carotene. Natural Carotene Corporation, Seed and Berry, May 10, 1994: US05310554 (48 worldwide citation)

Compositions of high-purity natural beta-carotene and of the 9-cis isomer of beta-carotene are provided, as are methods for the production of these compositions from plant matter, conveniently algae such as Dunaliella species. Typically, the compositions contain at least about 5% 9-cis beta-carotene ...


2
Haigh W Geoffrey: High purity beta-carotene. Natural Carotene Corporation, sHERMANNS Karl R, May 11, 1994: WO/1994/010140

Compositions of high-purity natural beta-carotene and of the 9-cis isomer of beta-carotene are provided, as are methods for the production of these compositions from plant matter, conveniently algae such as Dunaliella species. Typically, the compositions contain at least about 50 % 9-cis beta-carote ...