I want to examine how the introduction of African populations into Brazil might be visible in types of food produced or ingredients used. For example in the US gumbo is a dish rooted in African cuisine named after the central ingredient okra.
Maybe these will help. Some, of course are in Portuguese (Google translate should help :-)
The African presence in colonial Amazon
Vergolino-Henry, Anaíza, and Arthur Napoleão Figueiredo. A presença africana na Amazônia colonial: uma notícia histórica. Vol. 1. Governo do Estado do Pará, Secretaria de Estado de Cultura, Arquivo Público do Pará, 1990.
Schneider, H., et al. "Isolate breakdown in Amazonia: the blacks of the Trombetas river." Rev. bras. genét 10.3 (1987): 565-74.
Heywood, Linda M., and John K. Thornton. Central Africans, Atlantic creoles, and the foundation of the Americas, 1585-1660. Cambridge University Press, 2007.
Voeks, Robert A. "Traditions in transition: African diaspora ethnobotany in lowland South America." Mobility and migration in indigenous Amazonia: contemporary ethnoecological perspectives 11 (2009): 275.
I found a new source that seems very promising (and it is in English!). It covers three distinct contributor groups: the African slaves, the Portuguese colonizers and the native Indians. It has two chapters which will be of interest to your study: Brazilian North (Amazon included) and Northeast, where you will find the most typical Brazilian dishes originated from African slaves.
Hamilton, Cherie. Brazil: a culinary journey. Hippocrene Books, 2005.
Probably a book hard to find in libraries, but the publisher is selling it at:
You write about interesting gumbo. Is there any resources you recommend in particular gumbo ? I wonder how I can reach all of your work ? Thank you very much in advance.