Content and molecular-weight distribution of EU rubber from Eucommia ulmoides leaves
2007
Peng, J.N. | Su, Y.Q. | Sun, Q.S. | Yue, J. | Yoshihisa, N. | Sun, R.C.
The contents of EU rubber, extracted from leaves of Eucommia ulmoides, were determined by the gravimetric method, and the molecular-weight and molecular-weight distribution were determined by gel permeation chromatography (GPC). The results revealed that G3, X 18, L11, and L49 clones have the higher concentration of EU rubber, which contain more than 4.0 percent EU rubber. It was found that the content of EU rubber in high concentration clones were generally lowest in June, and highest in October except for G3 clone, while the trend of the molecular-weight and molecular-weight distribution was contrary to that of the content. The molecular-weight distribution of EU rubber showed a typical bimodal distribution. The higher molecular-weight fractions and the lower molecular-weight fractions were almost equal in June, whereas in August and October, the lower molecular-weight fractions were much larger than the higher molecular-weight fraction.
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