. Carotenoids. Carotenoids; Carotenoids. I30 CAROTENOID HYDROCARBONS OF KNOWN CONSTITUTION X TABLE 34 SOURCES FOR THE PREPARATION OF |8-CAROTENE Yield of carotene Source from 1 kg of material Literature references Carrots 1 g (max.) R. WiLLSTATTER and H. H. Escher, Z. physiol. Chem. 64 (1910) 47. — R. Kuhn and E. Lederer, Ber. 64 (1931) 1349. — H. N. Holmes and H. M. Leicester, /. Am. Chem. Soc. 54 (1932) 716. — N. T. Deleano and J. Dick, Biochem. Z. 23g (1933) 110. Cucurbita maxima Duch. (Fruit) g L. Zechmeister and P. Tuzson, Ber. 6y (1934) 824. Palm oil g P. Karrer, H. V, Euler
. Carotenoids. Carotenoids; Carotenoids. I30 CAROTENOID HYDROCARBONS OF KNOWN CONSTITUTION X TABLE 34 SOURCES FOR THE PREPARATION OF |8-CAROTENE Yield of carotene Source from 1 kg of material Literature references Carrots 1 g (max.) R. WiLLSTATTER and H. H. Escher, Z. physiol. Chem. 64 (1910) 47. — R. Kuhn and E. Lederer, Ber. 64 (1931) 1349. — H. N. Holmes and H. M. Leicester, /. Am. Chem. Soc. 54 (1932) 716. — N. T. Deleano and J. Dick, Biochem. Z. 23g (1933) 110. Cucurbita maxima Duch. (Fruit) g L. Zechmeister and P. Tuzson, Ber. 6y (1934) 824. Palm oil g P. Karrer, H. V, Euler and H. Hell- STROM, Ark. Kemi. B. 10 (1931) No. 15. — 0. Ungnade, Chem. Ztg. 63 (1939) 9. Paprica skin g L. Zechmeister and L. v. Cholnoky, Ann. 455 (1927) 70. Stinging nettles (ground) g R. WiLLSTATTER and A. Stole, Unttr- suchungen iiber Chlorophyll, Berlin 1934, Julius Springer, p. 237. — R. Willstatter and W. MiEG, Ann. 355 (1907) 12. TABLE 35 a-CAROTENE CONTENT OF DIFFERENT CAROTENE PREPARATIONS (kuhn and lederer*', KUHN AND BROCKMANN'^) Palm oil Green chestnut leaves Red berries Large pumpkin®'. Green stinging nettles Paprica Spinach Grass traces traces traces * None P. Karrer and W. Schlientz"*'. Preparation Following WiLLSTATTER and Escher''^, finely cut carrots are dried, ground and continuously extracted with petroleum ether at room temperature. The combined extracts are concentrated as far as possible at 30-40° under reduced pressure and diluted with an equal volume of carbon disulphide. From this solution the crude References p. 16^ Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Karrer, Paul, 1889-1971; Jucker, Ernst, 1918-. New York, Elsevier Pub. Co.
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