Study On The Method Of Improving The Quality Of Fruits And Vegetables With The Extract Of Stelleropsis Tianschanica

Xinjiang is rich in fruits and vegetables due to its unique geographical location.In recent years,in order to ensure the quality of fruits and vegetables,people use a large number of synthetic agents to control pests or preserve fruits and vegetables,which has a great potential safety hazard for human consumption.A large number of studies at home and abroad show that plant extracts have the characteristics of safety,effectiveness and no residue,which can be used in the preservation of fruits and vegetables,safely and effectively improve the quality of fruits and vegetables,and solve the problems of artificial chemical residues in fruits and vegetables.In this experiment,the extract of Stelleropsis tianschanica was used as the research object to explore its inhibitory effect on Tetranychus truncatus,Aphis nigromaculatus and common spoilage microorganisms in food,and the structure of the active parts of the extract of Stelleropsis tianschanica was identified.The main contents of this paper are as follows:1.Objective to explore the inhibitory effect of extracts from Stelleropsis tianschanica on Tetranychus truncatus and Aphis nigromaculatus.The results showed the inhibition rate of petroleum ether extract is more than 90%,and that of dichloromethane extract is about 70%.2.Escherichia coli,Bacillus subtilis and Staphylococcus aureus were selected as the common microorganisms in food,and the antibacterial activity of extracts from extract of Stelleropsis tianschanica was screened by Oxford cup method.The results showed that petroleum ether extract had a good inhibitory effect on Staphylococcus aureus,and the diameter of inhibition zone was 24.67 mm,ethyl acetate extract had a good inhibitory effect on Escherichia coli,and the diameter of inhibition zone was23.43 mm.3.In this experiment,26 compounds were isolated and identified by spectroscopy combined with physicochemical properties,contains two new compounds.They were identified as squalene(1)、(+)sesamin(2)、dibutyl phthalate(3)、inoleic acid(4)、daphneolon(5)viburnolide A(6)、 gingerglycolipid A(7)、 benzyl-O-b-D-glucopyranoside(8)、2,3-Dihydroxypropyldecanoate(9)、daphnetin(10)、raspberry ketone(11)、stelltianA(12)、3-(3,4-dimethoxybenzyl)-2-(3,4-methylenedioxybenzyl)butyrolactone(13)、stelltian B(14)、(2R,3R)-2,3-Di-(3,4-methylenedioxybenzyl)-butyrolactone(15)、Blumenol C(16)、(+)-pinoresinol(17)、4-hydroxy-2,3-dimethyl-2-nonen-4-olide(18)、vanillinalcohol(19)、3-(4-hydroxy-3-methoxy)-phenyl-1,2-propandiol(20)、(2S)-4-(4-hydroxy-3-methoxyphenyl)-2-butanol(21)、1H-Indole-3-carbaldehyde(22)、(+)-(7S,8S)-3-methoxy-3’,7-expoxy-8,4’-neolignan-4,9,9’-triole(23)、 2-(3’’,4’’-dimethoxybenzyl)-3-(3’-methoxy-4’-hydroxybenzyl)-(?)-butyrolactone(24)、2(S)-hydroxy-1-(4-hydro-xyphenyl)-5-phenyl-1-pentanone(25)、(2R,3R)-1,5-diphenylpentane-2,3-diol(26).