粘土鉱物へのβ-カロチン吸着に対するトリオレインの阻害

抄録

A difference in adsorption characteristics of β-carotene between one component (β-carotene) and two components (β-carotene and constant concentration of triolein) in n-hexane solution was investigated in order to elucidate the inhibition effect of triolein on β-carotene adsorption by attapulgites and sepiolites. The adsorption rate of triolein was faster than that of β-carotene in the two components hexane solution. The amount of β-carotene adsorbed per minitue at the very beginning of adsorption decreased to approximately 1/2-1/3 of that in the one component hexane solution. A decrease in the amount of triolein desorbed in hexane suggests that small number of adsorbed triolein were covered with β-carotene adsorption and that the rest of adsorbed triolein was independent of adsorption sites of β-carotene on adsorbent. Adsorption isotherms of β-carotene in the two components hexane solution were a typical Langmuir type in which the plot of adsorbed amount against the residual concentration gives a flat curve. Triolein adsorption capacity of adsorbent was proportional to the decrease in the amount of adsorbed β-carotene and this fact indicates that one molecule triolein adsorption inhibits 0.84 molecule β-carotene adsorption.