The Solubility of Insect Juvenile Hormone in Aqueous Solutions and Its Adsorption by Glassware and Plastics

Abstract The C18 juvenile hormone of insects can be dissolved in aqueous solutions up to a concentration of 2.5 - 3.0 × 10-5 M; changes in pH, buffer composition and ionic strength hardly affect this solubility. The hormone is salted out gradually by increasing ammonium sulphate concentrations. The juvenile hormone is bound to proteins such as bovine serum albumin or goat immunoglobulin G and can be kept in solution by these proteins up to 10-3 M. The hormone is strongly absorbed by many commonly used plastic materials but only to a lesser extent by glass and teflon.

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Effect of the ionic strength and pH of the medium on the behaviour of complexes formed by bovine serum albumin with poly-4-vinyl-N-ethypyridinium bromide in aqueous solutions

Polymer Science U S S R ◽

10.1016/0032-3950(81)90167-2 ◽

1981 ◽

Vol 23 (2) ◽

pp. 280-287 ◽

Cited By ~ 3

Author(s):

V.A. Kabanov ◽

M.I. Mustafayev

Keyword(s):

Ionic Strength ◽

Bovine Serum Albumin ◽

Serum Albumin ◽

Aqueous Solutions ◽

Bovine Serum

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Foam fractionation of proteins: Concentration of aqueous solutions of bovine serum albumin

Journal of Biochemical and Microbiological Technology and Engineering ◽

10.1002/jbmte.390010102 ◽

1959 ◽

Vol 1 (1) ◽

pp. 1-11 ◽

Cited By ~ 36

Author(s):

Robert W. Schnepf ◽

Elmer L. Gaden

Keyword(s):

Bovine Serum Albumin ◽

Serum Albumin ◽

Aqueous Solutions ◽

Bovine Serum ◽

Foam Fractionation

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Development and creation of zeta potential reference material of the particles in a liquid medium

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2021-4-58-62 ◽

2021 ◽

pp. 58-62

Author(s):

Dmitrii I. Belenkii ◽

Dmitry V. Averkin ◽

Dmitry V. Vishnevetskii ◽

Svetlana D. Khizhnyak ◽

Pavel M. Pakhomov

Keyword(s):

Bovine Serum Albumin ◽

Zeta Potential ◽

Serum Albumin ◽

Aqueous Solutions ◽

Bovine Serum ◽

Polystyrene Latex ◽

Powder Materials ◽

Silver Acetate ◽

Supramolecular Systems ◽

Standard Samples

A comprehensive study to develop and create standard samples of the zeta potential unit of particles in a liquid in accordance with the requirements of GOST ISO 13099-2-2016 in the range of measured values from minus 150 mV to plus 150 mV was carried out. The existing standard samples of zeta potential in Russia and the world have been investigated; the analysis of the applicability of the starting materials and components for the creation of new standard samples has done. Samples based on modified polystyrene latex microspheres, bovine serum albumin and supramolecular systems based on aqueous solutions of L-cysteine, N-acetylcysteine, and silver acetate were considered as promising standard samples of the zeta potential of particles. All studies were carried out on equipment from the State Primary Standard of Dispersed Parameters of Aerosols, Suspensions and Powder Materials GET 163-2020 using the method of electrophoretic light scattering and measuring the pH value. It was found that polystyrene latex microspheres do not correspond to the requirements of the work in terms of developing a set of standard samples. Samples based on suspensions of bovine serum albumin do not correspond to the requirements of GOST ISO 13099-2-2016. Supramolecular systems based on aqueous solutions of L-cysteine, N-acetylcysteine, and silver acetate were proposed as standard samples. Such systems are characterized by the ability to modify the initial potential-determining layer of particles without changing their aggregate stability. Studies of the long-term stability of the developed standard samples of the zeta-potential unit of particles in a liquid have been carried out.

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