Abstract: A fixative solution, suitable for fixation of biological materials such as human or veterinary biological tissues, cells, organs and secretions as well as bacteria, viruses, yeasts, parasites and biotech products such as embalming articles. The fixative solution is not a dangerous product according to European standards, and it contains low concentration of aldehydes or heavy metals, rendering a product that cannot be considered dangerous. Even so, biological samples can be optimally preserved and fixed with this solution.

Abstract: A fixation agent including at least one polyamine and at least one acidification agent. The quality and staining of tissue samples or tissue sections that have not been fixed with formalin is improved, with higher brilliance and color stability of the stain, allowing the tissue to be cut with a better quality without artifacts.

Abstract: A fixation agent including at least one polyamine and at least one acidification agent. The quality and staining of tissue samples or tissue sections that have not been fixed with formalin is improved, with higher brilliance and color stability of the stain, allowing the tissue to be cut with a better quality without artifacts.

Abstract: A fixative solution, suitable for fixation of biological materials such as human or veterinary biological tissues, cells, organs and secretions as well as bacteria, viruses, yeasts, parasites and biotech products such as embalming articles. The fixative solution is not a dangerous product according to European standards, and it contains low concentration of aldehydes or heavy metals, rendering a product that cannot be considered dangerous. Even so, biological samples can be optimally preserved and fixed with this solution.

Abstract: A fixative for fixing biological materials contains a depot agent, preferably a polyamine and especially hexamethylenetetramine, which reacts chemically with positively charged ions, especially H+ from an acid, while forming a fixative, where the fixative is an aldehyde and especially formaldehyde, which in turn reacts chemically with the biological material to be fixed in order to fix it and is consumed in doing so. By adjusting the pH of a solution containing the depot agent, a chemical equilibrium reaction occurs between the depot agent, fixative and biological material, so that just as much fixative is continuously formed as can be immediately consumed by the biological material. With that, the fixative, and especially the hazardous formaldehyde, cannot escape. Thus, an externally formaldehyde-free fixative that at the same time has the excellent fixative properties of formaldehyde is created.

Abstract: A fixative for fixing biological materials contains a depot agent, preferably a polyamine and especially hexamethylenetetramine, which reacts chemically with positively charged ions, especially H+ from an acid, while forming a fixative, where the fixative is an aldehyde and especially formaldehyde, which in turn reacts chemically with the biological material to be fixed in order to fix it and is consumed in doing so. By adjusting the pH of a solution containing the depot agent, a chemical equilibrium reaction occurs between the depot agent, fixative and biological material, so that just as much fixative is continuously formed as can be immediately consumed by the biological material. With that, the fixative, and especially the hazardous formaldehyde, cannot escape. Thus, an externally formaldehyde-free fixative that at the same time has the excellent fixative properties of formaldehyde is created.