Metastable zone determination of lipid systems: Ultrasound velocity versus optical back‐reflectance measurements

• DOI: 10.1002/ejlt.200900225
• Publication Date: 2010-03-15T12:59:39Z
• Authors: Kesarin Chaleepa; Anikó Szepes; Joachim Ulrich
• Keywords: Metastability; Saturation (graph theory)

Abstract The metastable zone width (MZW) of a multi‐component system as influenced by the process parameters cooling rate, agitation speed, and additive concentration was determined via ultrasound velocity measurements. results were compared with those obtained optical back‐reflectance measurements (ORM) using coconut oil model substance. Increasing rate led to shift nucleation point lower temperatures. This tendency better visualized ultrasonic curves while significant disturbance ORM signal could be observed. Agitation an increase temperature hence narrower zone. influence on MZW found strongly depend its concentration. detected technique that method, indicating faster response phase transition technique. Another advantage in situ evaluation experimental data, needed linear fitting estimate saturation temperature. Furthermore, are based density determination medium whereas sensor is able detect only particles located within measuring possess well‐defined size. Practical applications: one most important determine characteristics crystalline products. However, proper can used detection fat systems has rarely been reported, due difficulties dealing natural fats. findings this study greatly help who involved field crystallization from both academic practical view. fact new promising techniques for online fats, high accuracy, reproducibility, under conditions, clarified work. readers easily follow procedure developed paper. Also information about additives included.