Crystallization Behavior and Strength of Natural Rubber Isolated from Different Hevea Clone

2000 ◽  
Vol 73 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Seiichi Kawahara ◽  
Yoshinobu Isono ◽  
Takashi Kakubo ◽  
Yasuyuki Tanaka ◽  
Eng Aik-Hwee
Keyword(s):  
Fatty Acid ◽  
Natural Rubber ◽  
Fatty Acid Ester ◽  
Acid Ester ◽  
Proteolytic Enzyme ◽  
Crystallization Behavior ◽  
Crystallization Rate ◽  
The Other ◽  
Minimum Level ◽  
Green Strength

Abstract Crystallization behavior of natural rubbers of different clonal origins, i.e., RRIM 600, 60/2, 2025, 2026, and skim rubbers, was investigated by dilatometry at −25 °C. The latex samples were deproteinized with a proteolytic enzyme in the presence of surfactant. Skim rubbers were purified by centrifugation followed by acetone-extraction. The over-all crystallization rate of acetone-extracted rubbers could be divided into two categories: one includes RRIM 600, 60/2 and 2025, and the other RRIM 2026 and skim rubbers. This is attributed to the differences in the level of linked fatty acid groups and gel contents. The minimum level of linked fatty acid ester groups required to promote crystallization of natural rubber is about 2.8 mmol/kg. The green strength of the rubbers is dependent on the level of linked fatty acid ester groups.

Toxicity of Fatty Acid Ester Hydroperoxides

1963 ◽  
Vol 114 (3) ◽  
pp. 820-822 ◽  
Author(s):  
H. S. Olcott ◽  
A. Dolev
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Ester ◽  
Acid Ester

Colebroside A, A New Diglucoside of Fatty Acid Ester of Glycerin fromClerodendrum colebrookianum

2000 ◽  
Vol 2 (3) ◽  
pp. 177-185 ◽  
Author(s):  
Hui Yang ◽  
Bei Jiang ◽  
Ai-Jun Hou ◽  
Zhong-Wen Lin ◽  
Han-Dong Sun
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Ester ◽  
Acid Ester

scholarly journals Identification of Pinnatoxins and Discovery of Their Fatty Acid Ester Metabolites in Mussels (Mytilus edulis) from Eastern Canada

2012 ◽  
Vol 60 (6) ◽  
pp. 1437-1446 ◽  
Author(s):  
Pearse McCarron ◽  
Wade A. Rourke ◽  
William Hardstaff ◽  
Brandy Pooley ◽  
Michael A. Quilliam
Keyword(s):  
Fatty Acid ◽  
Mytilus Edulis ◽  
Fatty Acid Ester ◽  
Acid Ester ◽  
Eastern Canada

scholarly journals Estradiol Fatty Acid Esters in Adipose Tissue and Serum of Pregnant and Pre- and Postmenopausal Women

2007 ◽  
Vol 92 (11) ◽  
pp. 4327-4331 ◽  
Author(s):  
Maija Badeau ◽  
Veera Vihma ◽  
Tomi S. Mikkola ◽  
Aila Tiitinen ◽  
Matti J. Tikkanen
Keyword(s):  
Adipose Tissue ◽  
Fatty Acid ◽  
Postmenopausal Women ◽  
Fatty Acid Ester ◽  
Acid Ester ◽  
Physiological Role ◽  
Fatty Acid Esters ◽  
17Β Estradiol ◽  
Acid Esters ◽  
Free Estradiol

Abstract Context: The 17β-estradiol fatty acid esters are hormone derivatives with long-lasting estrogenic effect. They are transported in serum lipoproteins and thought to be sequestered in adipose tissue. Objective: Our objective was to determine the 17β-estradiol fatty acid ester concentrations in serum and adipose tissue in women of various hormonal states. Design: After several chromatographic steps separating esterified from free estradiol, time-resolved fluoroimmunoassay was used as a quantifying tool. Participants: Samples were obtained from pregnant women undergoing cesarean section (n = 13), or premenopausal (n = 8) and postmenopausal women (n = 6) during gynecological surgery. Main Outcome Measures: 17β-Estradiol and 17β-estradiol fatty acid ester concentrations in serum, and visceral and sc adipose tissue were examined. Results: The ratio of esterified to free estradiol in plasma increased with decreasing estradiol level from 0.5% in pregnant, to 15% in premenopausal and 110% in postmenopausal women. Estradiol esters constituted about 10% of the free estradiol present in adipose tissue in pregnancy. In nonpregnant women, most of the adipose tissue estradiol was in esterified form, the median ester to free ratio being elevated to 150–490%. After menopause, the overwhelming majority of estradiol in both free and esterified form was present in adipose tissue. Conclusions: The overall higher ester to free estradiol ratio in adipose tissue than in serum indicates active esterification capacity in adipose tissue. The predominance of esterified and free estradiol in postmenopausal adipose tissue compared with serum suggests in situ production and storage. Whether the estradiol esters have an independent physiological role in adipose tissue remains to be clarified.

scholarly journals Studies on the Synthesis of Cyclic Fatty Acid Ester

1974 ◽  
Vol 23 (1) ◽  
pp. 19-23
Author(s):  
Kazuhiko SUZAKI ◽  
Yoichiro TOTANI ◽  
Hyozi KUSAKA ◽  
Noboru MATSUO
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Ester ◽  
Acid Ester ◽  
Cyclic Fatty Acid
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