Fang Gui-zhen

Insecticidal activities and active components of the alcohol extract from green peel of Juglans mandshurica

The extract of green peel of Juglans mandshurica Maxim was extracted by common method for studying its insecticidal activities and analyzing the active components. Results showed that the alcohol extract and the chloroform part of extract (separated with chloroform from alcohol extract) form green peel of J. mandshurica have insecticidal activities in contact toxicity and stomach toxicity against larvae of Lymantria dispar L. After application of the extracts for five days, the corrected mortality of larvae of Lymantria dispar for both extracts was more than 50% in contact toxicity and stomach toxicity at the concentration of ≥ 5 g·L−1. The insecticidal activity for both alcohol extract and chloroform part of extract is more effect in contact toxicity than in stomach toxicity, but no significant difference in the insecticidal activities was found between alcohol extract and chloroform part of extract. The active components in the chloroform part of extract from green peel of J. mandshurica were analyzed by GC-MS. The analyzed results showed that the active components in the chloroform part of extract are: (1) juglone (5-hydroxy-1,4-naphthaoquinone), the relative content 27.11%, (2) 1,5-Naphthalenediol, the relative content 9.52%, (3) 7-Methoxy-1-tetralone, the relative content 6.81%, (4) Benzofuran, 2,3-dihydro-, the relative content 6.76%, (5) 4-Hydroxy-2-methoxycinnamaldehyde, the relative content 3.99%, (6) 2-Methoxy-4-vinylphenol, the relative content 3.05%.

Research on Magnetic activated carbon by XPS

XPS(X-ray photoelectron spectroscopy) spectrometer EscA-750 was used to analyse the surface character of activated carbon, magnetic reagent and magnetic activated carbon. The distribution and change of C valence of them were determined. The conclusion is that the magnetic reagent could be adsorbed on the surface of activated carbon chemically. the interpretation of adsorptive mechanism of magnetic reagent in microstructure was discussed.

Preparation of magnetic activated carbon

Based on the special molecular structure of surfactant, paramagnetic material used as magnetic nucleus was coated with two layers of surfactant including an inner layer and an outer layer. Magnetic reagent can combine with activated carbon due to adsorption of hydrophilic raclical of the outer surfactant layer. So activated carbon has magnetism. The effects of magnetic reagent dosage pH and activator upon the magnetic susceptibility of activated carbon were studied. Concerning the optimal conditions. MR-20 is the best magnetic reagent. Concentration of CaCl2 is 0.02M and pH 1.8–2.4. The physical properties of magnetic activated carbon vary with the types, dosage and magnetizing condition of magnetic reagent.

Study on chemical constitution of benzene and alcohol extractives ofTraceutron Sinense Olive

The wood powder ofTetracentron Sinense Olive was extracted with the benzene and alcohol (2:1 v/v). Then, the extractive is analyzed in Gc and Gc-Ms. Twenty chemical constitutions of the extractive are separated and identified, which are as follows: calamenene; 2.6,10-trimethyldihexyl; 3-methoxybenzaldehyde; Methyl-4-methox-ybenzoate; 4-methoxyphenylacetone; 3.4-dimethoxybenzaldehyde; 3.4-dimethoxyhypnone; methyl-3.4-dimethoxybenzoate; Methyl-4-methoxyphenylacrylate; 4,4′-dimethoxycabonyl-diphenylethane; Methyl-3, 4,5-erimethoxybenzoate; Methyl-3.4-dimethoxyphenylacrylate; Methyl-myristate; Methyl-palmate; Methyl-zoomarate; Methyl-stearate; Methyl-oleate; Methyl-arachidate; Methyl-behenate; Dimethylazelate.

STRUCTURAL ANALYSIS OF TETRACETRON SINENSE MWL

AbstrectThe Structural nature of Tctracctron sinense MWL is characterized by means of Chemical analysis. GC, IR, ’H NMR and13C NMR spectra. The researches indicated that the MWL is of guaiacyl-syringyl type. The main connective form between structural units is β-O-4 aryl ether bonds. The quantity of β-O-4 and 5-5 substructures is 0.53 / C9 and 0.06 / C9, respectively. The aliphatic and phenolic hydroxyl contents are 1.11/C9and 0.30/C9, respectively. The OCH3 content is estimated by13C NMR is spectrum (1.14 / C9), which is consistent with chemical method (1.11 / C9), The degree of condensetion of the MWL is 0.51 / C9 (from HNMR), which is consistent with the result from13C NMR.