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NFS CH 1

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  • Two main types of sensory evaluation

    Analytical (effective) tests focus on objective assessment by trained panelists, while affective (acceptance/preference) tests measure consumer preferences and involve untrained participants.

  • Purpose of discriminative testing

    To detect differences between food samples, determining if products differ in sensory characteristics.

  • Descriptive testing in sensory evaluation

    Assesses specific sensory characteristics like flavor, texture, and aroma using trained panelists to describe and quantify attributes.

  • Affective (acceptance/preference) tests

    Tests involving consumers to measure liking or preference, often using hedonic scales.

  • Hedonic tests and their scale

    Use a scale (e.g., 9-point) to measure consumer liking or preference for a product.

  • Personal preference tests

    Consumers express opinions by choosing preferred samples without detailed sensory description.

  • Key considerations for selecting a taste panel

    Include health status, dietary habits, sensory acuity, and diversity to ensure reliable and relevant results.

  • Importance of controlled conditions in sensory evaluation

    Ensures consistency in sample preparation and presentation to avoid bias and variability in results.

  • Environmental controls during sensory testing

    Use neutral lighting, quiet rooms, and neutral-colored containers to minimize distractions and influence on perception.

  • Role of neutral-colored containers

    Prevent color bias affecting sensory perception of food samples.

  • Why sensory evaluation is essential in product development

    It helps predict consumer acceptance and guides formulation to meet preferences.

  • Objective evaluation definition

    Uses physical and chemical methods to measure food properties, differing from subjective sensory tests.

  • Observable aspects measured by physical tests

    Include volume, density, viscosity, color, texture, and tenderness.

  • Definition and measurement of volume and density

    Volume is the space occupied; density is mass per unit volume, measured by displacement and weighing.

  • Viscosity and its cause

    Resistance of a fluid to flow caused by internal friction between molecules.

  • Function of microscope, colorimeter, and spectrophotometer

    Microscope examines structure; colorimeter and spectrophotometer measure color quantitatively.

  • Penetrometer, shortometer, and texture analyzer use

    Measure food tenderness and texture by assessing resistance to force or deformation.

  • Guidelines for chemical tests in food evaluation

    Follow standardized protocols including microbial evaluations to ensure safety and quality.

  • Benefits of electronic noses and tongues

    Provide consistent, cost-effective detection of odors and tastes, improving quality control.

  • Advantages and disadvantages of sensory vs. objective testing

    Sensory tests are direct but subjective and time-consuming; objective tests are faster, reliable, but may miss consumer perception.

  • Integrating sensory and objective evaluations

    Combines consumer perception with measurable properties for comprehensive food quality assessment.

  • Users of combined sensory and objective evaluations

    Food scientists and product developers use both to explore and improve food quality.

  • Major types of food evaluation methods

    Include sensory (analytical and affective) and objective (physical and chemical) testing methods.

  • Test type for evaluating marinara sauce pourability

    Viscosity measurement is most appropriate to assess how easily the sauce pours.