Sensory & consumer science
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What are the sensory characteristics a consumer considers
sight, taste, touch, hearing and smell
What is sight concerned with
appearance of food where consumers judge the shape, size & colour of the food to decide its quality
What is the colour of the food measured by
colourimeters & spectrophotometers
What affects the perception of colour
lighting
What are somatosensations
Sense of touch and are neurons underneath the skin that can sense tactile, thermal and irritation stimuli through various receptors
What is Chemesthesis
Chemesthesis are sensations which chemical compounds activate the receptors of other senses
What are sensations involved in Chemesthesis
Those involved are pain, touch & thermal perception in the eye, nose, mouth & throat
What are some examples of Chemesthesis sensations
Capsaicin & menthol work by stimulating thermoreceptors for heat & coldness Other sensations include fizziness of carbon dioxide, numbing sensation of mala & fiery sensation of ethanol
What are the 5 taste
sweet, sour, bitter, salty & umami
Where can taste be found
tongue, cheeks & soft palate
what are Olfactory receptors used for
olfactory receptors in the olfactory epithelium is used to detect compounds
What is Orthonasal sensations
Orthonasal refers to perception of aromas coming in from the nose before chewing it
What is Retronasal sensations
Retronasal refers to perception of aromas through the nose when chewing & swallowing it
What is flavour
Flavour is the perception resulting from stimulating a combination of taste buds, olfactory organs & chemesthetic receptors within the oral cavity Flavour can also refer to a mixture of volatile compounds that re concocted to impart the desired sensory characteristic of the food
What can Gas chromatograph do
Gas chromatograph can identify & quantify odour molecules present in food
Can sense of flavours be affected by other flavours
yes
Do all affective and affirmative test need to be codded
Yes
Do panelist for an affective test need to be trained
Panellist for affective sensory evaluation should do not need to be trained but should be from that consumer group
What are the affective test
acceptance test and preference test
What are analytical test
difference test, descriptive test, threshold test, time intensity
What are difference test
Difference test are designed to determine the differences between reference sample & test sample
What occurs in triangle test
In triangle test, panellist are presented with 3 unknown samples, 2 of which are identical
What occurs in a tetrad test
In tetrad test, 4 samples are presented simultaneously, 2 from 1 group & 2 from the other.
What is difference test used for
Difference test are used to develop product to match competitor & can be carried out as quality control test to ensure products produced on different days have a consistent sensory profile