Podcast
Questions and Answers
What is the principle of operation of biological olfactory cells?
What is the principle of operation of biological olfactory cells?
- Ion channel opening in the sensory neurons
- Changes in resistance in the active material layer
- Opening of the calcium channels in the epithelial cells
- Phenomenon of depolarization of their epithelium (correct)
What is the main advantage of E-nose over other methods of food quality assessment?
What is the main advantage of E-nose over other methods of food quality assessment?
- Highly sensitive to volatile compounds
- Can be used for complex mixtures of odorants
- Cheap and quick analysis (correct)
- Can detect a wide range of odorants
What is the purpose of pattern recognition in E-nose?
What is the purpose of pattern recognition in E-nose?
- To identify simple and complex odours (correct)
- To quantify the concentration of volatile compounds
- To detect the presence of specific odorants
- To differentiate between similar odours
What is the EU law definition of 'traceability'?
What is the EU law definition of 'traceability'?
What is the main difference between human and electronic noses?
What is the main difference between human and electronic noses?
What is the primary application of E-nose?
What is the primary application of E-nose?
What is a major limitation of sensory analysis in evaluating organoleptic food properties?
What is a major limitation of sensory analysis in evaluating organoleptic food properties?
What is the primary advantage of instrumental analysis over sensory analysis?
What is the primary advantage of instrumental analysis over sensory analysis?
Which instrumental technique is used to analyze the aroma of a product as a whole, without identifying individual compounds?
Which instrumental technique is used to analyze the aroma of a product as a whole, without identifying individual compounds?
What is the purpose of the olfactometric port in GC-O analysis?
What is the purpose of the olfactometric port in GC-O analysis?
Which technique is used to examine single compounds responsible for the aroma of a product?
Which technique is used to examine single compounds responsible for the aroma of a product?
What is the primary application of electronic nose technology?
What is the primary application of electronic nose technology?
What is a disadvantage of sensory analysis in terms of repeatability and reproducibility?
What is a disadvantage of sensory analysis in terms of repeatability and reproducibility?
What is the main advantage of GC-O over electronic nose technology?
What is the main advantage of GC-O over electronic nose technology?
Study Notes
Classical Methods in Organoleptic Quality Evaluation
- Based on sensory analysis by a group of trained panelists
- Limited by human factors (olfactory sensitivity, well-being, physical and mental state, tiredness, anosmia)
Instrumental Analysis
- Complements sensory analysis
- Offers advantages over sensory analysis (repeatability, reproducibility, compound identification, quantitative analysis)
Chromatographic Techniques
- Gas chromatography is one of the most often employed methods
- Enables analysis of individual aromatic compounds
- Gas chromatography-olfactometry (GC-O) examines single compounds responsible for aroma
Gas Chromatography-Olfactometry (GC-O)
- Technique based on sensory evaluation of eluate from chromatographic column by trained assessors
- Allows for quantitative and qualitative odor evaluation
- Enables description, duration, and intensity evaluation of odorous stimuli
- Identifies compounds responsible for unique aroma or taints of food products
Electronic Nose (E-nose)
- Device consisting of a matrix of electrochemical sensors selective for certain volatile compounds
- Equipped with a pattern recognition system for identification of simple and complex odors
- Cheap, fast, and an alternative to expensive food quality assessment methods
Functioning of Electronic Nose
- Sensors employ changes in resistance and other physical and chemo-physical phenomena
- Similar to biological olfactory cells, which function based on depolarization of epithelium (sodium-potassium pump principle)
Applications of Electronic Nose
- Designed for use in industries where aroma plays a significant role
Food Traceability
- Under EU law, means the ability to track food, feed, food-producing animals, or substances through all stages of production, processing, and distribution
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Description
This quiz covers the use of instrumental techniques, including E-nose devices, for assessing food quality. Learn about the advantages of these methods over traditional approaches.
