Main Event ERN 2023 -UMU-Workshop-“Hidden Science”

Quinine present in beverages such as tonic is fluorescent when irradiated over 360nm. Adding water with lemon and cyclodextrin produces hyperfluorescence due to the combined effect of lower pH and increased stiffness of the molecule when encapsulated with cyclodextrin. If gin is now added,

29/09/2023
Schedule, Workshop

The workshops scheduled for all ages in this activity are the following:

Face-to-face activities:

  • Fluorescent drinks

Quinine present in beverages such as tonic is fluorescent when irradiated over 360nm. Adding water with lemon and cyclodextrin produces hyperfluorescence due to the combined effect of lower pH and increased stiffness of the molecule when encapsulated with cyclodextrin. If gin is now added, as would be done in a GinTonic, fluorescence drops dramatically, due to both the dilution of quinine and the competition of alcohol for the hydrophobic cavity of cyclodextrin.

  • Secret messages

Phenolphthalein is a pH indicator that in acid solutions is colorless, but when it exceeds pH 8,3-10 it changes to a pinkish color. This property allows you to write secret messages that can only be deciphered using basic solutions, and hidden again with acid solutions.

pH indicators are of vital importance as they are used in the food, pharmaceutical and cosmetics industry to achieve safe and quality products.

  • Criminal investigation

Each person is a unique combination of hundreds of different factors that are determined by their genes, which define their biological identity. Among them, are the fingerprints formed by the papillae of the fingertips. These are formed during gestation and are maintained throughout life without significant changes. Fingerprints are unique to each individual, so they can be used to identify people unequivocally. Investigators can reveal fingerprints at a crime scene to find the culprit using graphite powder, as it is fixed to the fat left by the fingers when they touch a surface.

Online Activities:

  • Fluorescent drinks

*Video of the experiment*

Quinine present in beverages such as tonic is fluorescent when irradiated over 360nm. Adding water with lemon and cyclodextrin produces hyperfluorescence due to the combined effect of lower pH and increased stiffness of the molecule when encapsulated with cyclodextrin. If gin is now added, as would be done in a GinTonic, fluorescence drops dramatically, due to both the dilution of quinine and the competition of alcohol for the hydrophobic cavity of cyclodextrin.

  • Secret messages

*Video of the experiment*

Phenolphthalein is a pH indicator that in acid solutions is colorless, but when it exceeds pH 8,3-10 it changes to a pinkish color. This property allows you to write secret messages that can only be deciphered using basic solutions, and hidden again with acid solutions.

pH indicators are of vital importance as they are used in the food, pharmaceutical and cosmetics industry to achieve safe and quality products.

  • Criminal investigation

*Video of the experiment*

Each person is a unique combination of hundreds of different factors that are determined by their genes, which define their biological identity. Among them, are the fingerprints formed by the papillae of the fingertips. These are formed during gestation and are maintained throughout life without significant changes. Fingerprints are unique to each individual, so they can be used to identify people unequivocally. Investigators can reveal fingerprints at a crime scene to find the culprit using graphite powder, as it is fixed to the fat left by the fingers when they touch a surface.

 

Coordination: Silvia Navarro Orcajada, Department of Biochemistry and Molecular Biology “A”, University of Murcia.

Day and time: 29 September, 18-22 hours.

Location: Merced Campus Courtyard, University of

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