Study the effect of hydrophilization on bixin colorant - Expanding the application of annatto colorant in water-based food formulations.

PhD defence, Wednesday 16 January 2019. Amita Jahangiri

2019.01.16 | Olivia Elsebeth Belling-Nami

Amita Jahangiri.

During her studies, Amita Jahangiri studied the hydrophilization of natural colorant, bixin, through an enzymatic reaction. Bixin is known as the main color component of annatto seeds with orange to red color. Bixin contains an unsaturated, conjugated chromophore responsible for their lipophilic characteristic. The lipophilic inherent of bixin limits its applications in water-based food formulations. Amita studied how the hydrophilization of bixin can improve its aqueous solubility. Moreover, heat and light stability of the modified bixin was investigated in model systems and yoghurt.

The research findings indicate that a modification of the natural colorant bixin can change its physicochemical properties. The obtained knowledge could also provide useful information for the food industry.

The PhD degree was completed at Department of Food Science, Aarhus University

This résumé was prepared by the PhD student.

Time: Wednesday 16 January 2019 at 13.00
Place: Room M2, Department of Food Science, Aarhus University, Blichers Allé 20, 8830 Tjele
Title of PhD thesis: Modification of natural colorant bixin from Annatto plant - Improved solubility and stability of bixin through structural modification
Contact information: Amita Jahangiri, e-mail:
Members of the assessment committee:
Professor Charlotte Jacobsen, National Food Institute, DTU, Denmark
Scientist Hans-Richard Sliwka, Department of Chemistry, NTNU, Norway
Associate Professor Jette Feveile Young (chair), Department of Food Science, Aarhus University
Main supervisor:
Associate Professor Trine Kastrup Dalsgaard, Department of Food Science, Aarhus University
Marianne Danielsen, Ph.D., Department of Food Science, Aarhus University
Bjoern Madsen, M.Sc., Chr. Hansen Natural Colors A/S, Denmark
Language: The PhD dissertation will be defended in English

The defence is public.
The PhD thesis is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520 and 1521, 8000 Aarhus C.

PhD defence
12183 / i43