TY - GEN
T1 - Determination of Estolide Molecular Weight Distribution via Gel Permeation Chromatography.
AU - Sparks, Darrell
AU - Sharma, Brajendra
AU - Bantchev, Grigor
AU - Cermak, Steven
AU - Durham, Amber
AU - Price, Neil
PY - 2021
Y1 - 2021
N2 - Using the universal calibration and the Mark- Houwink equation (MHE) ([η]j=K(Mj)α ), three batches of oleic estolide acids and their correspo nding 2-ethylhexyl esters were characterized using gel permeation chromatography (GPC). The MHE parameters in tetrahydrofuran (THF) at 40C were determined (for acids: α = 0.4420.003 and logK=2.5050.007, for esters: α=0.5310.006 and logK =2.79 0.02). The fits of the GPC chromatograms yielded also the oligomeric composition of the estolides, which can be used to calculate the estolide number (EN) of an estolide mixture, and other molecular-weight distribution parameters, such as number-average molecular weight (Mn), weight-average molecular weight (Mw), and dispersity (Ð). Using the Deming line fit, we concluded that the GPC should be expected to be approximately three times more sensitive than the currently used methods for determination of EN values.
AB - Using the universal calibration and the Mark- Houwink equation (MHE) ([η]j=K(Mj)α ), three batches of oleic estolide acids and their correspo nding 2-ethylhexyl esters were characterized using gel permeation chromatography (GPC). The MHE parameters in tetrahydrofuran (THF) at 40C were determined (for acids: α = 0.4420.003 and logK=2.5050.007, for esters: α=0.5310.006 and logK =2.79 0.02). The fits of the GPC chromatograms yielded also the oligomeric composition of the estolides, which can be used to calculate the estolide number (EN) of an estolide mixture, and other molecular-weight distribution parameters, such as number-average molecular weight (Mn), weight-average molecular weight (Mw), and dispersity (Ð). Using the Deming line fit, we concluded that the GPC should be expected to be approximately three times more sensitive than the currently used methods for determination of EN values.
UR - https://aocs.onlinelibrary.wiley.com/doi/10.1002/aocs.12529
U2 - 10.1002/aocs.12529
DO - 10.1002/aocs.12529
M3 - Conference contribution
SP - 108
EP - 108
BT - 2021 AOCS Annual Meeting & Expo
ER -