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Exam Spring 2023: Random Coil Polysaccharides Flow Curve Characterization

12 Questions

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Exam Spring 2023: Random Coil Polysaccharides Flow Curve Characterization

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Questions and Answers

What characterizes the flow curve of random coil polysaccharides at low shear rates?

Viscosity is independent of shear rate (correct)

Entanglements are broken

Biopolymers tend to align

Viscosity decreases as shear rate increases

What happens to the viscosity of random coil polysaccharides as shear rate increases?

Viscosity decreases (correct)

Viscosity fluctuates

Viscosity remains constant

Viscosity increases

How does carboxymethyl cellulose (CMC) differ from xanthan gum in terms of rheological behavior?

Neither CMC nor xanthan gum exhibit any rheological behavior

CMC has similar viscosity over a wide range of shear rates (correct)

Both CMC and xanthan gum have shear thinning behavior

Xanthan gum 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 Signup and view all the answers

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 Signup and view all the answers

What happens to xanthan gum's viscosity at a shear rate of 50 1/seconds?

Viscosity rapidly decreases Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

What is a key focus during sensory profiling in product assessment?

Attention to the intensity of individual attributes. Signup and view all the answers

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. Signup and view all the answers