Superfoods Quality Control & Assurance 2 — Questions and Answers
Question 1: Which analytical method is most commonly used to verify the antioxidant capacity of superfood powders like acai or maqui berry?
- ORAC assay (Correct answer)
- Bradford protein assay
- Karl Fischer titration
- Brix refractometry
Correct answer: ORAC assay
The ORAC (Oxygen Radical Absorbance Capacity) assay measures a superfood's ability to neutralize free radicals and is the industry standard for antioxidant verification.
Question 2: A batch of spirulina powder tests positive for microcystin contamination. What is the most likely source?
- Co-cultivation with cyanobacteria producing the toxin (Correct answer)
- Heavy metal leaching from drying equipment
- Improper pH during spray drying
- Oxidation during long-term storage
Correct answer: Co-cultivation with cyanobacteria producing the toxin
Microcystins are hepatotoxins produced by certain cyanobacteria that can contaminate spirulina cultures if growth conditions are not tightly controlled.
Question 3: What does a Certificate of Analysis (CoA) for a superfood ingredient NOT typically include?
- Consumer purchase history (Correct answer)
- Microbial limits results
- Heavy metal test results
- Moisture content
Correct answer: Consumer purchase history
A CoA documents analytical test results such as microbial counts, heavy metals, and physical attributes — it does not contain consumer data.
Question 4: Which moisture level is generally considered safe for long-term storage of dried superfood powders to prevent mold growth?
- Below 10% water activity (aw < 0.60) (Correct answer)
- Between 15–20% moisture content
- Exactly 25% relative humidity
- Above 12% moisture content
Correct answer: Below 10% water activity (aw < 0.60)
Keeping water activity below 0.60 inhibits mold and microbial proliferation, making it the critical threshold for shelf-stable superfood powders.
Question 5: A company claims its goji berries are 'USDA Certified Organic.' What third-party verification is required to make this claim legally in the US?
- Certification by a USDA-accredited certifying agent (Correct answer)
- Self-attestation by the manufacturer
- A signed letter from the country of origin
- ISO 22000 certification
Correct answer: Certification by a USDA-accredited certifying agent
Under the National Organic Program, USDA-accredited certifying agents must inspect and certify operations before any product can bear the USDA Organic seal.
Question 6: Why is high-performance liquid chromatography (HPLC) preferred over simple colorimetric tests for verifying curcumin content in turmeric products?
- HPLC separates and quantifies individual curcuminoids with high precision (Correct answer)
- HPLC is cheaper and faster than colorimetric tests
- Colorimetric tests are banned by the FDA for curcumin
- HPLC detects microbial contamination simultaneously
Correct answer: HPLC separates and quantifies individual curcuminoids with high precision
HPLC can individually resolve curcumin, demethoxycurcumin, and bisdemethoxycurcumin, providing an accurate potency profile that simple colorimetric tests cannot distinguish.
Question 7: Which international standard specifically addresses food safety management systems and is commonly sought by superfood manufacturers supplying global retailers?
- ISO 22000 (Correct answer)
- ISO 9001
- ISO 14001
- ISO 45001
Correct answer: ISO 22000
ISO 22000 is the internationally recognized standard for food safety management systems, integrating HACCP principles and is widely required by global food retailers.
Superfoods Quality Control & Assurance 2
Which analytical method is most commonly used to verify the antioxidant capacity of superfood powders like acai or maqui berry?