Case story database

Search for Successfully Implemented Alternatives

You can use the free text search function to find information in the case story database. Most suitable are: substance name and other substance identifier (EC- and CAS-number). You can refine your search after first entry for sector-, function- and process-categories. The case studies are meant to serve as source of inspiration and ideas for substitution. The alternatives are constantly being developed further. We therefore recommend that you to check in each individual case whether an alternative is suitable for your applications and purposes. If you are aware of any other relevant information that is not mentioned in the current case story, please contact SUBSPORTplus.

In order to utilize information in the best way, please take note of the SUBSPORTplus methodology on case stories!

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Substitution von Formamid durch Natriumhydroxid und Ethanol bei der Denaturierung von DNA zur Vorbereitung für die Fluoreszenz-in-situ-Hybridisierung (FISH).

Formamid wird verwendet, um DNA für die Fluoreszenz-in-situ-Hybridisierung (FISH) zu denaturieren. Die Aufgabe des Formamid ist es, die in der Probe enthaltene DNA in die Einzelstränge zu trennen, so dass eine Gensonde an einen Strang binden kann. Die FISH-Technik wird verwendet, um das Vorhandensein oder Fehlen bestimmter DNA-Sequenzen in Chromosomen zu lokalisieren. In den letzten 15 Jahren hat die Uniklinik Sahlgrenska die 70%-ige Formamidlösung durch 30ml einer 1,9%-igen Natriumhydroxidlösung und 70ml absolutem Ethanol (99,5%) substituiert.

Die Substitution funktioniert gut, und die Angestellten haben keine bestimmten Einschränkungen durch die Alternative festgestellt.

Im nationalen Zentrum für Gesundheitsdaten und Seuchenschutz in Dänemark (SSI) ausgeführte Substitutionen.

SSI hat es geschafft, Borsäure, Ethidiumbromid und Ether durch Essigsäure, einen nicht-mutagenen DNA-Farbstoff und Natriumhydroxid zu substituieren. Derzeit wird an der Bewertung einer Alternative zu Trypanblau in der Zellfärbung gearbeitet.

Substitution of concentrated sodium hydroxide with sodium hydrogen carbonate for pH adjustment in pharmaceutical production.

Neutralisation of a product during a pharmaceutical production was earlier done by applying sodium hydroxide. Sodium hydroxide was substituted with the less hazardous alternative sodium hydrogen carbonate.

Substitution of formamide with sodium hydroxide and ethanol in denaturation of DNA in the preparation of fluorescent in situ hybridization (FISH)

Formamide is used to denature DNA in Fluorescent In Situ Hybridization (FISH). The specific purpose of the formamide is to make the DNA in the sample single stranded, which allows a probe to bind into the remaining strand. The FISH technique is a method used to locate the presence or absence of specific sequences of DNA in chromosomes.

For the past 15 years the department for clinical genetics at Sahlgrenska University Hospital has substituted the 70% solution of formamide with 30 ml of 1.9% solution of sodium hydroxide and 70 ml of absolute ethanol (99,5%). The substitution works well and the staff has not noticed any specific limitations with the alternative.

Substitutions performed at the National Centre for Health Data and Disease Control in Denmark (SSI)

SSI have managed to substitute boric acid, ethidium bromide and ether with acetic acid, a non-mutagenic DNA dye and sodium hydroxide. They are currently working on validation of an alternative to Trypan Blue in cell staining.

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