Studies on Sweet Potatoes Rich in Carotene (Report III)
On the Extraction Method of Carotene from Sweet Potatoes
1958 Volume 16 Issue 5 Pages 149-152
Details
1958 Volume 16 Issue 5 Pages 149-152
(I) 100g of sweet-potato powder (40 mesh) was extracted seven times with 550cc of petroleum ether (b. p. 60°-70°C), divided into seven portions: 200, 100, 50, 50, 50 50 and 50cc. The combined extract was concentrated to 50cc under reduced pressure. The concentrated matter was saponified with 20cc of 5% alcholic KOH overnight at room temperature, and after washing with water the concentrated carotene was obtained by evaporating under reduced pressure. The concentrated carotene from carrot powder was compared with that of the sweet potato under the same conditions.
(II) The raw material of sweet-potato “Yo No. 7”, after crashing and pressing, was separated into juice and pressed residue. By this treatment, carotene in raw material was divided into juice and pressed residue, 64% and 36% respectively. By heating the juice above 80°C, coagulated matter was obtained. This coagulated matter was the concentrated substance that contained much more carotene than raw material, but the amount produced was poor.
