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09-04-27-10-TIandAstringency

09-04-27-10-TIandAstringency - Time-intensity technique...

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A C Nobled Feb 7 2002 1 Time Intensity Profiling Time-intensity technique monitors the intensity of sensory attributes over time. D t ti l ” d d Data are “continuously” recorded – usually with a mouse and computer. What is TI analysis? Panelists indicate perceived intensiy of sensation associated with product over time Example: perceived intensity time (s) 120 400 500 600 ty Sucrose -------------- Aspartame ----------- Mean Sweetness Time Intensity Curves 0 100 200 300 Intensit 0 20 40 60 80 100 120 Time (Seconds) Parameters extracted from TI curves intensity A I A = Imax (Perceived maximum intensity B = Tmax (Time to maximum intensity C = Lag time (reaction time) D = Ttot (Total duration) E = Rate of increase at half maximal intensity Time Perceived B C D E F G H G+H F = Rate of decrease at half maximal intensity G = Area under curve prior to maximal intensity H = Area under curve after maximal intensity I = Tplat (Plateau time) Time of expectoration or swallowing 500 600 700 800 1 2 Judges differ due to Individual “criteria”: 0 100 200 300 400 0 20 40 60
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  • Spring '09
  • HildergardHeymann
  • Cabernet Sauvignon, Tannin, intensity bitterness intensity, half maximal intensity, bitterness intensity CS

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