Introduction - Exercises

12 important questions on Introduction - Exercises

Which fraction and size is separated in the retentate (isolated) after micro filtration?

Fat globules, >1000 nm

Which fraction and size is separated in the retentate (isolated) after ultrafiltration?

Casein micelles, 50-300 nm

Which fraction and size is separated in the retentate (isolated) after nano filtration?

Whey proteins, 3-50 nm
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Which fraction and size is separated in the retentate (isolated) after reverse osmosis?

Carbohydrates & Salts (= ash), <3 nm

Which different modified states of proteins are present in a 'skim milk powder' made using only microfiltration?

Globular (whey) + macro micelle casein

Which non-protein compounds are present in a 'skim milk powder' made using only microfiltration?

Lactose/salts

Which different modified states of proteins are present in a 'whey protein concentrate' made using micro- and ultra-filtration?

Globular

Which non-protein compounds are present in a 'whey protein concentrate' made using micro- and ultra-filtration?

Lactose/salts

How is rennet casein isolated?

Based on precipitation (neutral pH), includes enzymatic treatment

What happens to a acid casein after isolation?

pH remains acidic

What happens to a K-caseinate after isolation?

pH is readjusted to neutral using KOH

What is the solubility for an acid casein (after isolation)?

Precipitation takes place at pI

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