Differentiation of Rubber and Gutta Hydrocarbons in Plant Materials

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Abstract
Hydrocarbons of the rubber (r) or gutta (g) types isolated from Hevea brasiliensis (r), Mimusops balata (g), Asclepias erosa (milkweed (r)), A. syriaca (milkweed (r)), Oenothera biennis (Evening primrose (r)), Solidago leavenworthii (goldenrod (r)), Eucommia ulmoides (g), Euonymus japonicus (g), and Jatropha sp. (chiite (r)) were positively identified by their light absorptions near 12 µ. Mixed cis- and trans-isomers were absent in all cases, even though the plants examined were selected as giving hydrocarbon polymers of questionable types.

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