Types of fermentation in food and beverage processing: principles, microorganisms, and applications

Fermentation is one of the oldest and most significant biotechnological processes employed in food and beverage production. It involves the biochemical transformation of raw substrates by microorganisms or their enzymes, leading to the formation of products with improved shelf life, safety, sensory attributes, and nutritional value. Over centuries, diverse fermentation types have evolved, ranging from simple spontaneous processes to highly controlled industrial systems. This review provides a comprehensive overview of the major types of fermentation used in food and beverage processing, emphasizing their underlying principles, dominant microorganisms, metabolic pathways, and practical applications. Alcoholic, lactic acid, acetic acid, propionic, alkaline, and mixed fermentations are discussed in detail, along with emerging and non-conventional fermentation systems. The role of fermentation in food preservation, flavor development, nutritional enhancement, and functional food production is critically examined. In addition, traditional and modern fermentation practices are compared, highlighting technological advancements, starter culture development, and process control strategies. This review aims to serve as a foundational reference for students, researchers, and professionals engaged in food biotechnology and fermentation science.