Flashcards in Food Analysis Deck (78)
Which type of HPLC analysis involves the use of a polar stationary phase and a non-polar mobile phase?
Normal phase HPLC
What types of carrier gases are used to carry samples in a gas chromatograph?
Helium and Nitrogen
What test is used to detect adulteration of milk with water?
Freezing point analysis
What symbol is used to express the O/R potential of a system?
The symbol Eh
What statistic is equal to the square root of the sample variance?
What property is the Westphal balance used to measure?
What property does a piezometer measure?
What phenomenon occurs when a compound absorbs light and then immediately re-emits energy as light of a longer wavelength?
What law describes the relationship between absorbance and concentration?
What is the unit of expression of transmittance in spectrophotometry?
What is the standard method for determining total nitrogen in food?
Kjeldahl Nitrogen Determination
What is the specific gravity of sulfuric acid used in the Babcock Test for milk?
What is the scale to measure percent sugar?
What is the principle of Atomic Absorption Spectroscopy?
Determination of elements based on absorption of radiation by the free atoms
What is the official method for determining sulfites in foods?
Modified Monier-Williams Procedure
What is the most commonly used test for the detection of improperly pasteurized milk?
Alkaline Phosphatase test
What is the most accurate and sensitive method for quantitative determination of metals and metalloids?
Atomic Absorption Spectroscopy
What is the Michaelis Menten equation?
Vo = Vmax[S] / Km + [S]
What is the Henderson Hasselbach equation?
pH=pKa + log [base]/[acid]
What is the denominator of a t-test?
Standard error of the mean
What is the common term used to describe -log(H+)?
What is provitamin A?
What is an Operating Characteristic or OC curve?
A plot of the probability of acceptance of a lot of material at various levels of defects in the lot at a given AQL (acceptable quality level).
What is a type II error?
Falsely accepting a null hypotheses
What is a Mojonnier test used for?
Percentage milk fat
What instrument is used to determine Brix?
Hydrometer or refractometer
What instrument is used for measuring optical activity of compounds?
Polarimeter - Dextrorotatory (+), Levorotatory (-)
What does the Schaal Oven test measure?
Susceptibility of fat to undergo lipid oxidation
What does the phenol sulfuric acid assay measure?