alpha-cyclodextrin and 1-methylcyclopropene

alpha-cyclodextrin has been researched along with 1-methylcyclopropene* in 2 studies

Other Studies

2 other study(ies) available for alpha-cyclodextrin and 1-methylcyclopropene

ArticleYear
Dissociation characteristic of the inclusion complex of cyclomaltohexaose (alpha-cyclodextrin) with 1-methylcyclopropene in response to stepwise rising relative humidity.
    Carbohydrate research, 2010, Sep-23, Volume: 345, Issue:14

    The dissociation of a crystalline complex of cyclomaltohexaose (alpha-cyclodextrin) and 1-methylcyclopropene has been studied in response to stepwise rising relative humidity at 50 degrees C using a dynamic vapor sorption instrument. The dissociation of the inclusion complex was monitored with a proton transfer reaction mass spectrometer. The increase in relative humidity generally triggered the complex dissociation. However, the dissociation was greatly retarded at 80% relative humidity, presumably owing to collapse of the crystalline structure. Abrupt dissociation was observed at 90% relative humidity which corresponded to complex dissolution. The changes in powder X-ray diffraction pattern of the inclusion complex during the storage period were also investigated.

    Topics: alpha-Cyclodextrins; Cyclopropanes; Humidity; Microscopy, Electron, Scanning; X-Ray Diffraction

2010
Kinetics of molecular encapsulation of 1-methylcyclopropene into alpha-cyclodextrin.
    Journal of agricultural and food chemistry, 2007, Dec-26, Volume: 55, Issue:26

    1-methylcyclopropene (1-MCP), an ethylene inhibiting regulator, is commercially available in the form of an inclusion complex with alpha-cyclodextrin (alpha-CD). In this study, molecular encapsulation of gaseous 1-MCP into aqueous alpha-CD was investigated in a closed, agitated vessel with a flat gas-liquid interface. Molecular encapsulation of gaseous 1-MCP by alpha-CD is a simultaneous two-step reaction which involves the aqueous dissolution of gaseous 1-MCP and the encapsulation of the dissolved molecules by alpha-CD. The kinetics and mechanism of molecular encapsulation were analyzed based on the depletion rate of 1-MCP in the headspace of the vessel. The encapsulation rates could be explained quantitatively by the gas absorption theory with a pseudo-first-order reaction between 1-MCP and alpha-CD. The negative value of the calculated apparent activation energy of encapsulation (-24.4 kJ/mol) implied the significant effect of exothermic aqueous dissolution of 1-MCP. An encapsulation temperature of 15 degrees C was optimal; at this temperature, the highest 1-MCP yield and best inclusion ratio of inclusion complex were obtained. Changes in the X-ray diffraction pattern suggested that the crystal lattice structure of alpha-CD was altered upon inclusion of 1-MCP.

    Topics: Agrochemicals; alpha-Cyclodextrins; Capsules; Cyclopropanes; Gases; Kinetics; Solutions; Thermodynamics; X-Ray Diffraction

2007
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