CL5895 Test 2 Revision

What is the most distinguishing element present in proteins?

• Nitrogen

• Sulfur

• Carbon

• Hydrogen

What are the general steps in the kjeldahl method?

• Distillation - Digestion - Titration

• Digestion - Distillation - Titration

• Titration - Digestion - Distillation

• Titration - Distillation - Digestion

During the distillation process, nitrogen is captured by boric acid in the form of ...

• Nitrite

• Nitrate

• Ammonia

• Urea

What is the difference between Dumas method and kjeldahl method?

• Dumas method is Time consuming

• Dumas methos has affordable equipment

• Dumas method use hazard chemicals

• Dumas method can analyze many samples

Calculate the conversion factor for milk if the % of protein nitrogen of milk is 15.67%.

• 6.25

• 6.28

• 6.35

• 6.38

Kjeldahl method will quantitate protein concentration based on ________?

• peptide bonds

• absorbance

• refractive index

• nitrogen content

Which of the following is Not an advantage of the Kjeldahl method?

• Widely used internationally

• High precision

• All the nitrogen in food is present as protein

• Good reproducibility

What is the order of the steps in Dumas method?

• Reduction and Separation, Combustion, Detection

• Combustion, Reduction and Separation, Detection

• Detection, Reduction and Separation, Combustion

• Combustion, Separation, Reduction, Detection,

Why do we measure moisture content?

• Legal & Economic requirements

• Microbial stability

• Food processing operations

• None of the options

When measuring samples for moisture content, what are some of the ways

that can be used to minimise moisture gains and losses to the sample?

• Minimize exposure to the open atnosphere

• Remove the cover so that water can evaporate

• Reduce the headspace in the sample storage container

• Reduce contaminants for other surfaces