Refining Manufacturing Practices
South America is home to several of the largest producers of dehydrated milk products and both people and economies depend on the powdered beverage for sustenance. In order to optimize production and fortify the market, a group of Argentinian researchers set out to determine the impact of heat treatments and manufacturing season on color change.2 Using a reflectance spectrophotometer to obtain CIE Lab scale values, the team analyzed color data from milk powder after both direct and indirect heat treatment and found distinct color shifts created by the methods. The results indicated that indirect heat treatment, which requires greater, more sustained heat application, produced more pronounced browning as the result of “the combined action of temperature and time.” Meanwhile, direct heat application had a less severe effect on color. However, the exact nature of the color shifts was also dependent on the quality of the raw material; the milk powder produced in the summer had lower L* values along with higher a* and b* values. This may be due to the fluctuating chemical composition of the raw milk as determined by seasonal animal diet. In particular, variation in carotene levels appears to determine the level of browning reaction each sample displayed when exposed to both direct and indirect heat processing.
These observations could have important implications for milk powder manufacturing practices and product success. As dairy processing research continues to harness the power of spectrophotometry to analyze color change in response to processing variables, farmers and manufacturers alike can tailor their production to satisfy the demands of consumers as well as develop more exact methods to improve product stability and maximize shelf-life. This may be particularly critical in countries like Argentina, where powdered milk is the primary dairy export and acts as a major economic engine. Moreover, enhanced quality assurance is critical to meeting the needs of populations who rely on milk powder to safely deliver essential nutrients.
The HunterLab Difference
HunterLab instrumentation has played an integral role to ensuring the quality and safety of food products for decades. Our commitment to excellence ensures that you are able to obtain the most accurate color data possible throughout both research and manufacturing processes, allowing you to produce the best products possible with ease and confidence. Contact us to learn more about our innovative range of spectrophotometers, sophisticated software, and world-class customer service.