12 Questions
What characterizes the flow curve of random coil polysaccharides at low shear rates?
Viscosity is independent of shear rate
What happens to the viscosity of random coil polysaccharides as shear rate increases?
Viscosity decreases
How does carboxymethyl cellulose (CMC) differ from xanthan gum in terms of rheological behavior?
CMC has similar viscosity over a wide range of shear rates
What is the key difference in rheological behavior between carboxymethyl cellulose (CMC) and xanthan gum?
CMC has shear thinning behavior, xanthan gum does not
Why do rotational viscometer readings show similar viscosities for carboxymethyl cellulose (CMC) and xanthan gum?
Xanthan gum experiences high enough shear rates to reduce its viscosity to that of CMC
What happens to xanthan gum's viscosity at a shear rate of 50 1/seconds?
Viscosity rapidly decreases
Why is a sample with low viscosity more likely to result in higher perceived flavor or taste intensity?
Low viscosity allows the sample to move readily in the mouth, exposing fresh surfaces.
In the context of the text, what is the significance of the 'viscous blob' in relation to flavor and taste perception?
Only flavor and taste components at the surface of the blob are perceived.
Which of the following is NOT a capability required of a panel during the assessor screening process for quantitative descriptive analysis (QDA)?
To conduct chemical analysis of food samples.
Why is it important to select sensory terms that are relevant to the samples during the assessor screening process for quantitative descriptive analysis?
To ensure accurate evaluation and description of samples.
What is a key focus during sensory profiling in product assessment?
Attention to the intensity of individual attributes.
What is an important step after vocabulary development in the assessor screening process for quantitative descriptive analysis (QDA)?
Training panelists using sensory references and term reduction.
This quiz focuses on the characterization of random coil polysaccharides based on their flow curve behavior. Learn about the Newtonian-like region at low shear rates and how increasing shear rates affect the viscosity due to entanglements and alignment of biopolymers.
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