Card 141
Question
In Gas Chromatography (GC), what component separates the volatile compounds by partitioning them between a mobile phase and a stationary phase?
Answer
Column
Food analysis
Discover Food analysis: 381 flashcards with questions and answers.
- Subject
- Sciences / Chemistry
- Language of creation
- English
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Cards in this set
Card 142
Question
Which reagent is used in the Kjeldahl method to digest organic nitrogen?
Answer
Concentrated sulfuric acid.
Card 143
Question
Define Beer's law.
Answer
Concentration and absorbance are proportional in spectroscopy
Card 144
Question
The TBA method (thiobarbituric acid) is used to monitor oxidative rancidity. What does the method actually measure?
Answer
Concentration of malondialdehyde (MDA)
Card 145
Question
What does CI stand for wrt statistical analysis?
Answer
Confidence Interval
Card 146
Question
What does the microscopic technique 'CLSM' stand for?
Answer
Confocal Laser Scanning Microscopy
Card 147
Question
Which statistical tool is commonly used to monitor process variability over time?
Answer
Control charts (SPC).
Card 148
Question
For what part of a proximate analysis is the Soxhlet apparatus used for?
Answer
Crude fat
Card 149
Question
What does it mean for data to be precise?
Answer
Data points are close together
Card 150
Question
Does the iodine value increase or decrease during autoxidation?
Answer
Decrease
Card 151
Question
What does Thiobarbituric acid number or value tell you?
Answer
Degree of lipid oxidation, specifically secondary oxidation products (malondialdehyde)
Card 152
Question
What is the highest designation of wine quality in Italy?
Answer
Denominazione di Origine Controllata e Garantita (DOCG)
Card 153
Question
What is DSC and what is it used for?
Answer
Differential Scanning Calorimetry. It is used to measure thermal transitions in foods such as melting point, crystallization, and glass transition, often for fats, starches, and proteins.
Card 154
Question
Name 2 functions of H2SO4 in the Babcock milk fat test.
Answer
Digest protein to release fat, generate heat to melt fat, increase density of serum
Card 155
Question
What are the three steps of Kjeldahl method?
Answer
Digestion, distillation, titration
Card 156
Question
What is the difference between direct and indirect ELISA?
Answer
Direct ELISA- only one antibody used; Indirect ELISA-2 antibodies used for detection
Card 157
Question
How do you calculate the coefficient of variation?
Answer
Divide the standard deviation by the mean and multiply by 100.
Card 158
Question
What template is used in conducting real-time PCR?
Answer
DNA
Card 159
Question
Name an official method of food analysis for ash determination.
Answer
Dry ashing
Card 160
Question
What does the 'E' stand for in the Beer-Lambert Law?
Answer
E is Molar Extinction Coefficient (L·mol⁻¹·cm⁻¹)
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