Card 321
Question
Where is commercial lecithin (food additive) obtained?
Answer
Soybean, also from egg yolks, sunflower seeds, and rapeseed
Food analysis
Discover Food analysis: 381 flashcards with questions and answers.
- Subject
- Sciences / Chemistry
- Language of creation
- English
381 flashcards
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Cards in this set
Card 322
Question
What does SG stand for in food analysis?
Answer
Specific Gravity
Card 323
Question
What does a hydrometer measure?
Answer
Specific gravity (relative density) of liquids, often used to assess sugar content in beverages or milk
Card 324
Question
What does 'c' stand for in E=mc^2?
Answer
Speed of light
Card 325
Question
When working with data, what is the measure of dispersion or variation in a group of scores?
Answer
Standard Deviation
Card 326
Question
In reversed phase gas chromotography, is the stationary phase polar or non-polar, and do polar or non-polar compounds elute first?
Answer
Stationary phase is non-polar, Polar compounds elute first
Card 327
Question
What is 'regression analysis'?
Answer
Statistical method to analyze relation between 2 or more variables such that one of them can be predicted by using information of the other
Card 328
Question
The S/N ratio, important to all chromatographers, is the signal to noise ratio. Name two types of noise.
Answer
Statistical noise (which includes shot noise and Johnson noise), environmental noise, baseline drift, electronic noise (thermal or shot noise)
Card 329
Question
What is the full form of SQC with regards to food quality?
Answer
Statistical Quality Control
Card 330
Question
What sugar is not detected using Nelson’s reagent assay?
Answer
Sucrose
Card 331
Question
What type of compounds is a flame photometric detector specific for?
Answer
Sulfur and phosphorous groups
Card 332
Question
What is the name of the heat resistant enzyme in Thermus aquaticus used for modern PCR?
Answer
Taq DNA polymerase
Card 333
Question
How do you measure oxidation in meat products?
Answer
TBARS value
Card 334
Question
Name 1 method of second degree product of rancidity.
Answer
TBARS, VOCs, sensory evaluation, p-anisidine value, HPLC, GC, mass spectrometry
Card 335
Question
What are the Delvo and Charm tests used for?
Answer
Testing for the presence of antibiotics in milk
Card 336
Question
What is the most popular instrument for measuring the textural quality of foods?
Answer
Texture analyzer
Card 337
Question
What does it mean for data to be accurate?
Answer
That data is close to the true value of measurement
Card 338
Question
What does a conductivity meter measure?
Answer
The ability of a solution to conduct electric current
Card 339
Question
pH value is a measure of acidity. what is a pKa value the measure of?
Answer
The acid dissociation constant; it reflects the strength of an acid — specifically, the pH at which half of the acid is dissociated
Card 340
Question
The TBA analysis is a colorimetric reaction; what does this mean?
Answer
The analyte of interest does not have a chromophore and must react with a substance so that a chromophore is created and absorbance can be read to determine the concentration of an analyte
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