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Identification and quantification of fatty acids in hunting web of adult Steatoda grossa (Theridiidae) female spiders

Zimny Dżastin, Patrzałek Michał, Kowalska Teresa, Sajewicz Mieczysław, Surmiak-Stalmach Kinga, Wilczek Grażyna

Acta Chromatographica

2022

Vol. 34, no. 1

71--76

This is the first study on composition of fatty acids in hunting web of Steatoda grossa (Theridiidae) spiders and one of only four similar studies ever made. Its main contribution is a discovery that fatty acids not only cover an outside of the web fibers, but they are even more abundantly represented in the fibers’ inner structure. Although little attention has been so far attributed to the contents of fatty acids in spider silks, one has to remember that their biocompatibility combined with an extraordinary tensile strength make them a worth investigating template for material bioengineering studies.

Determination of metaldehyde in different commercial pesticide formulations using green analytical procedure and gas chromatography flame ionization detection

Płonka Marlena, Miszczyk Marek, Marczewska Patrycja, Sajewicz Mieczysław

Acta Chromatographica

2019

Vol. 31, no. 4

286--290

Metaldehyde is a molluscicide allowed for use in the control of slugs and snails in agriculture and horticulture in many countries. A simple, fast, and precise gas chromatography method was developed and single-laboratory validated for determination of metaldehyde in different formulations of plant protection products. The proposed method involves extraction of active substance from samples by sonication with acetone and analysis using gas chromatography–flame ionization detection (GC–FID). The suggested analytical procedure is accurate, precise, and repeatable. Moreover, it is environmentally friendly and useful for laboratories as it uses a no time- and no solvent-consuming reference chromatography technique for quality control of commercially available pesticide formulations. Advantages of the proposed method are consistent with the ideas of sustainable development, which are in accordance with the principles of Green Analytical Chemistry. Analysis of real samples of commercial pesticide formulations confirmed that the proposed method is fit for its purpose.