Card 221
Question
What is the purpose of proximate analysis?
Answer
It quantifies the food's five major components; it's based on gravimetric (weight) based procedures.
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 222
Question
Measurement of protein content of food uses specific factors based on the type of food, to convert nitrogen to protein content. What is the name of these specific factors?
Answer
Jones factor
Card 223
Question
What is the distillation method used to measure moisture called?
Answer
Karl Fischer method
Card 224
Question
What is the quantitative determination of organic nitrogen and therefore protein?
Answer
Kjeldahl method
Card 225
Question
Name an official method of food analysis for protein determination.
Answer
Kjeldahl, Dumas
Card 226
Question
The Beer-Lambert Law is A=ECL; what does the 'L' stand for?
Answer
L the length of the light path, usually in cm
Card 227
Question
In SDS-PAGE, what is the use of SDS?
Answer
Largely eliminates the influence of the structure and charge, and proteins are separated solely based on polypeptide chain length.
Card 228
Question
What does the Fiske-Subbarow assay measure?
Answer
Levels of inorganic phosphate in biological samples
Card 229
Question
What does the term “LOD” stand for in analytical chemistry?
Answer
Limit of Detection
Card 230
Question
At low water activity what is the main deteriorative concern?
Answer
Lipid oxidation
Card 231
Question
A soxhlet extractor was originally designed to extract what from solid foods?
Answer
Lipids
Card 232
Question
What does LCL stand for wrt statistical analysis?
Answer
Lower Control Limit
Card 233
Question
What is meant by sensitivity in a biological assay?
Answer
Magnitude of a change of an analytical instrument w/ changes in compound concentration
Card 234
Question
Which Mass spec technique relied on large protein fingerprint for bacteria?
Answer
MALDI-TOF MS
Card 235
Question
In apple juice, titratable acidity should be reported as which acid equivalent?
Answer
Malic acid
Card 236
Question
What does MS stand for in food analysis?
Answer
Mass Spectrometry
Card 237
Question
Alcohol insoluble solids content in vegetables is indicator of what?
Answer
Maturity, fiber content, and textural quality
Card 238
Question
What does Kjeldahl measure and how does it quantify proteins?
Answer
Measures nitrogen content and therefore, protein indirectly.
Card 239
Question
In polysaccharide structure analysis, which analysis is for characterizing the linkage types?
Answer
Methylation analysis or NMR spectroscopy
Card 240
Question
How to express in concentration, ppm equivalent as weight per volume?
Answer
mg/L or microg/ mL
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