The Study On 1-Methylcyclopropene And Its Inclusion Complex

Rapid decline in coriander leaf quality due to postharvest senescence often causes serious commercial losses. Ethylene has been shown to play an important role in senescence of detached leaves. Ethylene gas, a common air pollutant and powerful plant growth regulator is a two-edged sword in the handling perishables. Recent studies have suggested that many crops are affected by exposure to ethylene concentrations as low as a few parts per billion. Luckily, researchers and technologists have developed a number of new approaches to ethylene control using molecular biology, novel chemistries and innovative technologies. It has been found that many compounds can modulate ethylene responses. However, some known inhibitors have certain drawbacks. The compound 1 -methylcyclopropene (1-MCP) has been shown to compete with ethylene for the binding site on the ethylene receptor in plant tissue and to control ethylene responses. Since it is non-toxic and odorless, 1 -MCP is potentially of commercial value to control ethylene-dependent postharvest disorders. Researchers have studied the possible application of 1-MCP to fruits and vegetables. But 1-MCP is discommodious to use in agriculture products because of its resolvability (b.p. 10℃) .β -cyclodextrin (β-CD) is an annular molecule composed of seven glucose units linked by 1,4-glucosidic bonds. The inside the cavity of β-CD is mainly constructed by oxygen atoms and hydrogen atoms of C (3 ) and C (5) . The internal surface of β -CD is hydrophobic. The hydroxyl of the glucose unit is arranged at both ends of the β -CD cavity, so the whole molecule of β-CD is able to form inclusion complexes with a great variety of guest molecules. After complexation, the guest molecules display additional stability against heat, light and oxygen. Accordingly, in recent years, β-CD has aroused great interest and has been successfully and widely utilized in the pharmaceutical and food industries. Moreover, toxicity experiments show that β -CD can be absorbed as a carbohydrate by animal and human bodies. Recent studies about β -CD have shown that there are vast vistas in many fields. The present paper describes the preparation of the inclusion complex of 1 -MCP with β -CD in lab and its investigation by a series of methods in order to provide theoretical data for further applications. At the same time, the stability of 1-MCP isomers was investigated by density functional theory (DFT / B3LYP ) in order to inform the effects of 1 -MCP for inhibiting the ethylene. In this paper, The inclusion complex of 1-methylcyclopropene with β...