Flavour Development in Cocoa and Chocolate

Abstract

Cocoa is a major global commodity and the key ingredient in chocolate production. The cacao plant, Theobroma cacao L., is cultivated in tropical regions within 20 degrees north and south of the equator, mainly in West Africa and South America, where environmental conditions support both crop growth and post-harvest processing. Beyond its economic importance, cocoa is also valued for its unique and complex flavour, which develops through a series of interconnected biological, chemical and physical processes. 
The transformation of cacao into chocolate involves several stages, each contributing to flavour development. Some of these, known as “primary processes”, take place in producing countries and include harvesting, fermentation, and drying. Fermentation is a key step in the chocolate production chain, as it initiates the formation of flavour precursors. During this phase, natural microbial activity generates heat and chemical changes inside the beans, leading to the breakdown of proteins and polysaccharides into smaller molecules that are essential for flavour formation.
Dry cocoa beans are then transported to importing countries, where they undergo “industrial processes” such as roasting, grinding, refining, conching, and tempering. Roasting is particularly important for flavour development, as it promotes chemical reactions, including the Maillard reaction, which produce many of the characteristic chocolate aromas. These reactions lead to the formation of volatile compounds such as pyrazines and aldehydes, responsible for roasted, nutty, and sweet notes. Each stage of the process is interconnected, and this interdependence strongly determines the final flavour profile of chocolate.
Despite a high global demand for chocolate, flavour quality can vary significantly depending on origin, processing conditions, and supply chain practices. In recent years, increasing attention has been given to sustainability and ethical sourcing, as well as to improving fermentation and processing methods to enhance both flavour and value. Understanding how flavour develops in cocoa and chocolate is therefore essential not only for product quality, but also for supporting a more sustainable and transparent cocoa supply chain.

Speaker Biography

Leonardo Lorenzi is a Food Technologist currently leading R&D at Foreverland Food, where he focuses on cocoa-free chocolate. He has worked in both academic research and the food industry, with roles in R&D, consultancy, and product development across various innovative companies.
He holds a PhD in Energy and Sustainable Development from the Engineering Department of the University of Perugia, carried out in collaboration with Wageningen University. His research and industrial work have led to patent applications in both the energy and food sectors. Academic background includes a Master’s degree in Food Technology and Biotechnology, along with additional training in leadership and communication from the University of Parma.
With deep expertise in fermentation and sustainable food processes, Leonardo applies a rigorous scientific approach combined with an ability to translate research into practical, impactful innovations.