Modified and convenient preparation of silica impregnated with silver nitrate and its application to the separation of steroids and triterpenes

Li, Tong‐Shuang; Li, Ji‐Tai; Li, Huizhang

doi:10.1016/0021-9673(95)00619-x

Cited by 71 publications

(42 citation statements)

References 20 publications

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“…The hydrocarbon fraction was further separated on 300 mg of silver nitrate-treated silica (Li et al 1995). The fraction, in hexane, was loaded onto the column, and the alkanes were eluted with hexane (two 1-ml fractions), the monoalkenes with dichloromethane (B&J, High Purity Solvent; five 1-ml fractions), and the dialkenes with acetonitrile (EMD, Omnisolv, High Purity Solvent; two 1-ml fractions).…”

Section: Methodsmentioning

confidence: 99%

Monoalkenes as Contact Sex Pheromone Components of the Woodwasp Sirex noctilio

Böröczky

Crook²,

Jones

et al. 2009

J Chem Ecol

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A pheromone on the cuticle of females of the woodwasp Sirex noctilio, a recently introduced pest of pines in North America, induces conspecific males to attempt copulation. Dead females washed with hexane did not elicit copulation attempts from males, whereas reapplication of a female hexane body wash onto the cuticle of dead females elicited copulation attempts by 65% of males tested. Analysis of the hexane extract revealed saturated and unsaturated hydrocarbons as major components of the female cuticle. Behavior-guided fractionation of the female body wash led to the identification of three components, (Z)-7-heptacosene, (Z)-7-nonacosene, and (Z)-9-nonacosene, of the sex pheromone of S. noctilio that elicited copulatory responses from males.

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Section: Methodsmentioning

confidence: 99%

Monoalkenes as Contact Sex Pheromone Components of the Woodwasp Sirex noctilio

Böröczky

Crook²,

Jones

et al. 2009

J Chem Ecol

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“…The silica gel impregnated with silver nitrate was prepared by the method reported previously with slightly modification [34] (Figure.2). To avoid waste and the risk of blindness, the silver ion content in silica gel impregnated with silver nitrate for the impact on the separation of these two isomers was first observed on silver ion TLC plate [34].…”

Section: Column Packingmentioning

confidence: 99%

Silver ion chromatography for peak resolution enhancement: Application to the preparative separation of two sesquiterpenes using online heart-cutting LC-LC technique

Yang

Zhang

Wei

et al. 2018

Talanta

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Silver ion chromatography, utilizing columns packed with silver ions bonded to silica gel, has proved to be an invaluable technique for the analysis of some positional isomers. In this work, silver ion chromatography by combination with online heart-cutting LC-LC technique for the preparative separation of two sesquiterpenes positional isomers from a natural product was investigated. On the basis of the evaluation that silver ion content impacts on the separation, the laboratory-made silver ion columns, utilizing silica gel impregnated with 15% silver nitrate as column packing materials, were used for peak resolution improvement of these two isomers and the preparative separation of them in heart-cutting LC-LC. The relationship among the maximal sample load, flow rate and peak resolution in the silver ion column were optimized, and the performance of the silver ion column was compared with conventional C column and silica gel column. Based on the developed chromatographic conditions, online heart-cutting LC-LC chromatographic separation system in combination with a silica gel column and a silver ion column that was applied to preparative separation of these two isomers from a traditional Chinese medicine, Inula racemosa Hook.f., was established. The results showed that the online heart-cutting LC-LC technique by combination of a silica gel column and a silver ion column for the preparative separation of these two positional isomers from this natural plant was superior to the preparative separation performed on a single-column system with C column or silica gel column.

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“…To a solution of 5 g AgNO 3 in 15 ml CH 3 CN, 15 g silica gel were added, the mixture was ground for 5 min, and the beaker was covered completely with aluminum foil, and held at 70°C overnight resulting in the evaporation of the solvent. The slightly grayish silica was used for chromatography as usual, covering the column with aluminum foil (Li et al, 1995). 1 130.5, 129.1, 114.1, 64.5, 33.8, 29.6, 29.1, 29.0, 28.9, 28.2, 27.2, 26.7, 26.0, 20.9.…”

Section: -Acetoxypentyl Triphenyl Phosphonium Bromidementioning

confidence: 99%

Biological Activity of the Larval Secretion of Chilecomadia valdiviana

et al. 2011

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The carpenter worm, Chilecomadia valdiviana (Lepidoptera: Cossidae), is a polyphagous insect native to Chile that is associated with trees and bushes, including economically important species such as eucalyptus, avocado, and apples. We used a Y-olfactometer to analyze the olfactory responses of larvae to conspecific larvae, hexane extracts of larvae, and synthetic samples of the major components present in the extract (i.e., (Z)-5,13-tetradecadienyl acetate, (Z)-5-tetradecenyl acetate, and dodecyl acetate). The results obtained provide empirical evidence that (Z)-5,13-tetradecadienyl acetate is used as an aggregation pheromone by the larvae. The results are discussed in view of the existing information.

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Modified and convenient preparation of silica impregnated with silver nitrate and its application to the separation of steroids and triterpenes

Cited by 71 publications

References 20 publications

Monoalkenes as Contact Sex Pheromone Components of the Woodwasp Sirex noctilio

Monoalkenes as Contact Sex Pheromone Components of the Woodwasp Sirex noctilio

Silver ion chromatography for peak resolution enhancement: Application to the preparative separation of two sesquiterpenes using online heart-cutting LC-LC technique

Biological Activity of the Larval Secretion of Chilecomadia valdiviana

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