1、what is the main content of food analysis? a、nutritional ingredients b、food additives c、food contamination d、food sensory evaluation
2、special instrument analysis technologies do not include: a、oven b、food fiber pumping equipment c、lipid analyzer d、ph meter
3、what is the role of food analysis? a、food producer b、food regulator c、food consumer d、food developer
4、what is the development trend of food analysis? a、laboratory modern instrument analysis technology b、special instrument analysis technology c、expensive instrument analysis technology d、on-site analysis and non-destructive testing technology
5、the international aoac is the worldwide standardization organization of the official chemists association.
6、the research contents of food analysis include safety, nutrition, acceptability, and ____.
7、the four aspects of the structure of gas chromatography include gas path, sampling, ____, detecting system.
8、methods of food analysis include sensory evaluation, ____ analysis, enzymatic analysis, microbiological analysis, and instrumental analysis.
1、what is real-time testing? what is offline testing? please give differences between the above two.
1、the source of systematic error does not include a、the scale of the container is not accurate. b、there are shortcomings in the measurement method. c、changes in experimental conditions. d、impure reagents.
2、for liquid and semi-solid samples such as vegetable oil and wine, the smaller the sampling amount, the better.
3、when evaluating analysis results, we should first examine its precision and then its accuracy.
4、random errors cannot be reduced or eliminated by correction methods, so they are uncontrollable.
5、when measuring viscous sample liquid, it is advisable to use a density bottle with capillary.
6、the better the precision of the measurement result, the higher its accuracy.
7、for pile-shaped loose-grained samples, a double-set rotary sampling tube should be used to insert samples around a pile of samples and at the top, middle, and bottom of the top part.
8、the general procedures of food analysis include sample collection, preparation, pretreatment, sample inspection, and result calculation.
9、the sampling methods include ____ sampling and representative sampling.
1、what are the principles of sample pretreatment?
2、what information should be known before sampling?