Probiotics are beneficial microorganisms that support host health. They are extensively used in food, healthcare and pharmaceutical industries. Accurate viability assessment is imperative not only to ensure product quality and efficacy but also to meet consumer expectations. This review provides a systematic analysis of probiotic history, international regulatory standards and functional characteristics across strains. It provides a comprehensive overview of probiotic enumeration techniques, which range from traditional culture methods to modern emerging technologies that drive current research and applications. By critically evaluating the strengths and limitations of these methods, this review explores future directions for probiotic enumeration, offering valuable insights for quality control in probiotic products and supporting advancements in related scientific research.
Keywords: Probiotics; enumeration methods; international regulatory standards; strain characteristics; traditional and emerging technologies.
The history of probiotics, international regulatory standards, and functional characteristics across different strains are systematically examined, offering insights into their impact on research and global applications.Traditional plate counting remains the “gold standard,” but it is time-consuming, cumbersome, and fails to detect viable but non-culturable (VBNC) microorganisms, leading to an underestimation of viable probiotics.Emerging methods, such as molecular biology techniques and biosensors, offer significant improvements in accuracy, sensitivity and detection efficiency, but face challenges in scalability, cost and equipment requirements.The most appropriate method should comprehensively consider factors such as budget, time constraints, the characteristics of the target microorganism, and the purpose of detection.Future research may focus on integrating multiple methods to optimize strengths, reduce costs, automate processes, simplify procedures for user-friendly operation, and address the current limitations of existing techniques.