Matrix solid phase dispersion (MSPD).

Matrix solid-phase dispersion is an analytical technique for the preparation and extraction of solid and viscous samples. The technique uses bonded-phase solid supports as an abrasive to produce disruption of sample architecture and a bound solvent to aid complete sample disruption during the sample blending process. The sample disperses over the surface of the bonded phase-support material to provide a new mixed phase for isolating analytes from various sample matrices. This review discusses the factors that affect the use of matrix solid-phase dispersion and provides a bibliography of its applications for the extraction and analysis of a range of compounds

Matrix solid-phase dispersion

Oxidants or reactive oxygen species are produced in our body during aerobic metabolism leading to many diseases such as cancer, cardiovascular diseases etc. Antioxidants are the chemicals that neutralize these oxidants. Natural antioxidants are the secondary metabolites of phytochemicals and are preferred over synthetic antioxidants, which are found to impose side effects. A review has been done on the effect of oxidants on human health and their neutralization by natural antioxidants. Major natural antioxidants and their plant sources, different recovery processes for antioxidants from plant matrices and the advantage of indirect supercritical fluid extraction over other processes are presented.

	 

	Key words: Free radical, secondary metabolites, oxidative stress, recovery processes, process parameters.

Phytochemical antioxidants for health and medicine A move towards nature

Removal of DDD and DDE from wastewater using bagasse fly ash, a sugar industry waste

Pesticide residue analyses in plant material by chromatographic methods: clean-up procedures and selective detectors

Extraction methodology and chromatography for the determination of residual pesticides in water

Chromatographic methods in the determination of herbicide residues in crops, food and environmental samples.

A method is described for the determination of the triazine herbicides prometryne, desmetryne, terbutryne, OH-atrazine and OH-simazine in purified extracts of milk using analytical capillary isotachophoresis. The reproducibility of isotachophoretic analyses was 3.5% and the detection sensitivity reached 2 ng. Recovery of triazines from fortified samples of homogenized full milk (0.05 mg/L) was about 65%.

Isotachophoretic determination of herbicides prometryne, desmetryne, terbutryne and hydroxy-derivatives of atrazine and simazine in extracts of milk.

The leaf oil obtained by hydrodistillation from Melissa officinalis L. c. v. citra cultivated at Nitra locality (Slovak Republic) was analyzed by GC and GC/MS. M. officinalis oil was found to contain geranial (33.60%), neral (22.18%), citronellal (11.30%), caryophyllene oxide (8.35%), geranyl acetate (5.89%), and β-caryophyllene (4.20%) as the major components. More than 50 components were identified in the oil.

Jozef Tekel

Papers

Pesticide residue analyses in plant material by chromatographic methods: clean-up procedures and selective detectors

Extraction methodology and chromatography for the determination of residual pesticides in water

Chromatographic methods in the determination of herbicide residues in crops, food and environmental samples.

Isotachophoretic determination of herbicides prometryne, desmetryne, terbutryne and hydroxy-derivatives of atrazine and simazine in extracts of milk.

Composition of the Essential Oil from Melissa officinalis L. cultivated in Slovak Republic