{"type":"rich","version":"1.0","provider_name":"Transistor","provider_url":"https://transistor.fm","author_name":"The Startup CPG Podcast","title":"R&D RADIO: How Water Activity Keeps Shelf-Stable Food Safe, Crunchy, and Fresh","html":"","width":"100%","height":180,"duration":1972,"description":"\nIn this episode of R&D Radio, host Adam Yee sits down with Zachary Cartwright, Principal Food Scientist at AQUALAB by Addium, to break down one of the most important but least understood metrics in food science: water activity. They cover what water activity is, what the numbers mean, how it affects safety, texture, and shelf life, and how brands of any size can start testing for it.\n\nZach holds a PhD in Food Science from Washington State University, where he also serves as adjunct faculty in the School of Food Science. Over the past seven years at AQUALAB, he has worked with thousands of food scientists across low-moisture food categories, and has applied moisture science to pharmaceuticals, cosmetics, cannabis, and even gunpowder and batteries. AQUALAB provides water activity, moisture analysis, and moisture sorption solutions that help food companies improve product quality, stability, shelf life, and food safety.\n\nAdam and Zach dig into the 0.6 water activity threshold for microbial growth, critical water activities that cause caking, sogginess, and sticky gummies, the difference between moisture content and water activity, and why packaging, temperature, and humidity matter so much. They also share practical ways for smaller brands to access testing, what to look for in a water activity meter, and how large manufacturers use water activity from incoming ingredients through production.\n\nListen in as they discuss:\n\nWhat water activity really measures: the capacity of water to cause biological, chemical, and physical changes in a product\nWhy a water activity above 0.6 creates an environment where mold, yeast, and bacteria can grow\nHow critical water activities drive caking and clumping in powders, lost crispness in snacks, and sweating in gummies\nHow a water activity test works, from closed-chamber equilibrium to readings in as little as 60 seconds\nThe difference between moisture content and water activity, and how a moisture sorption isotherm helps predict...","thumbnail_url":"https://img.transistorcdn.com/pMuUaMpWaAi3tfCEgC2OkLBVzokuLjLsIzwDIbGFqi4/rs:fill:0:0:1/w:400/h:400/q:60/mb:500000/aHR0cHM6Ly9pbWct/dXBsb2FkLXByb2R1/Y3Rpb24udHJhbnNp/c3Rvci5mbS9hMTFl/MTgxNTNlZTAwZjU1/ZmNmNWM1ZjkwMDg5/NTU4MS5wbmc.webp","thumbnail_width":300,"thumbnail_height":300}