Membrane Model to Explain the Participation of Carotens and the Changes in Energy in Photosynthesis


  • Federico García-Jiménez Universidad Nacional Autónoma de México
  • José Luis Sánchez Millán Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán. Universidad Nacional Autónoma de México.
  • Yolanda Castells Universidad Nacional Autónoma de México
  • Ofelia Collera Universidad Nacional Autónoma de México



Photosynthesis, Tyrosine Z, Carotenoids, P680, Pheophytin.


We have found several bands in the visible and near infrared that are related to the primary process of photosynthesis. Starting from the value of 1830 mV (677.5 nm) which was found by some authors and corresponds to activated PSII, there is a first loss of 580 mV leading to a carotenoid cation (Phe/Car+) formation which is in close contact with pheophytin (Phe) in accordance with previous works leaving P680/P680+ with an energy of 1250 mV. We propose that in this process the carotenes may change their stereochemistry from trans to cis thus avoiding the electron return path.


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Author Biographies

Federico García-Jiménez, Universidad Nacional Autónoma de México

Instituto de Química

José Luis Sánchez Millán, Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán. Universidad Nacional Autónoma de México.

Instituto de Química.

Cátedras de investigación: Mejoramiento de plantas comestibles. Química de suelos, plantas y agua.


Yolanda Castells, Universidad Nacional Autónoma de México

Escuela Nacional Preparatoria, Plantel 6, Antonio Caso

Ofelia Collera, Universidad Nacional Autónoma de México

Instituto de Química


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