Karen Liu

Karen Liu

Contributing Editor & Food Scientist
4 articles

Why you should trust me: I have a Master's degree in Food Science from UC Davis, where my thesis focused on capsaicinoid profiling in Capsicum chinense cultivars using HPLC. I've published in the Journal of Agricultural and Food Chemistry and reviewed submissions for the International Journal of Food Science. Before joining KnowThePepper, I worked in quality assurance for a spice company, testing capsaicin concentrations.

What I actually do here: I verify every scientific claim on the site. If we say a pepper is 1,000,000 SHU, I trace that number back to a specific study or measurement. I also write the science-focused guides — the Scoville scale explainer, capsaicin chemistry deep-dives, and anything involving receptor biology.

Favorite thing to research: The TRPV1 receptor. It's the reason capsaicin makes you feel heat, and the biology behind it is genuinely fascinating. I wrote our capsaicin guide and could happily write three more.

Least favorite part of the job: Reading "studies" from supplement companies claiming capsaicin cures everything. It doesn't. I spend too much time debunking bad science.

UC Davis Food Science MSc Published in JAFC Former spice company QA Can identify capsaicin by smell
Expertise: Capsaicinoid chemistry HPLC analysis Scoville testing Food safety TRPV1 receptor biology

Qualifications & Background

  • 🎓 M.S. Food Science & Technology, UC Davis (2015); B.S. Chemistry, UCLA (2013)
  • 📜 Institute of Food Technologists (IFT) Member; Certified Sensory Analyst (CSA)
  • ⏱️ 10 years of professional experience
  • 🏆 Outstanding Graduate Research Award — UC Davis (2015)
  • 🏆 Food Science Communicator Award — Institute of Food Technologists (2022)

Publications & Media Features

Selected Publications

  • 📄 Stability of Capsaicinoid Content at Raised Temperatures
    PubMed / Natural Product Communications, 2014 — Read article →
  • 📄 Thermal Degradation of Capsaicin and Dihydrocapsaicin During Cooking
    BioOne / Bioscience, Biotechnology, and Biochemistry, 2021 — Read article →

Media Mentions

  • 📰 CBS News
    "World's Hottest Pepper Is Grown in South Carolina" (Nov 2023) — Read feature →
💼 LinkedIn

Guides by Karen Liu

Science Guide
Scoville Scale Explained: How We Measure Pepper Heat
How pepper heat is measured, SHU ratings, and what the numbers mean in practice.
Science Guide
What Is Capsaicin? The Compound That Makes Peppers Hot
The compound that makes peppers hot. Health benefits, pain relief, and how it works.
Science Guide
How to Stop Pepper Burn on Hands, Eyes & Mouth
Stop hot pepper burn on hands, eyes, and mouth. Milk, oil, and other proven remedies.
Science Guide
The 5 Domesticated Pepper Species Explained
The 5 domesticated Capsicum species explained. Key traits, climate needs, and top varieties.
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