TY - JOUR T1 - In-Line Measurement of Color and Total Phenolics during Red Wine Fermentations Using a Light-Emitting Diode Sensor JF - American Journal of Enology and Viticulture JO - Am. J. Enol. Vitic. DO - 10.5344/ajev.2014.14023 SP - ajev.2014.14023 AU - Nicholas L. Shrake AU - Rajeevan Amirtharajah AU - Charles Brenneman AU - Roger Boulton AU - André Knoesen Y1 - 2014/10/01 UR - http://www.ajevonline.org/content/early/2014/09/24/ajev.2014.14023.abstract N2 - An in -line color and total phenolic sensor is described to track the color and total phenol evolution during red wine fermentations. The sensor uses multiple light emitting diodes (LEDs) spanning the ultraviolet and visible spectrum, in particular 280 and 525 nm. The performance of phenolic sensor was evaluated by analyzing fermentation samples collected from multiple red wine fermentations performed during the 2012 season. The study confirmed the LED phenolic sensor measurements strongly correlate with measurements performed with a reference UV-Vis spectrophotometer and that inline measurements can be made in a practical manner after removal of yeast and pulp with a 2.0 micron filter. The use of a 100 micron pathlength flow cell avoids the need for dilution, making in-line measurements possible. The sensor provides inline measurement on the evolution of the total phenolic content and color extraction patterns during red wine fermentations. ER -