Reasons for choosing our testing services
ZHONGXI Testing has obtained inspection qualification certifications from multiple countries and regions worldwide. We possess a senior testing team and advanced testing methods, providing independent, impartial, and professional third-party verification services for global carbon projects.
Internationally recognized authority
Certified by multiple international standards such as CNAS, VCS, and GS, with reports universally applicable worldwide.
Global service capability
Covering 140+ countries and regions, it supports on-site detection and remote verification in multiple languages.
Professional experimental methods
Adopt standard experimental methods to ensure accurate and reliable data.
Professional Yeast Viability & Activity Testing Service
We understand that you are searching for a reliable yeast activity test – whether for brewing, baking, bioethanol production, pharmaceutical fermentation, or probiotic yeast formulations. Our specialized yeast viability and metabolic activity testing service is designed to give you far more than a simple live/dead count. We provide a complete functional assessment that predicts real-world fermentation performance.
What We Test and How Deep We Go
Our platform goes well beyond methylene blue staining. We offer a suite of high‑resolution assays: flow cytometry with dual fluorescent staining (FDA/PI and SYTOX) for precise viability even in complex matrices, intracellular ATP measurement for metabolic energy status, oxidation‑reduction potential (ORP) kinetics during sugar fermentation, and single‑cell microrespiratory profiling using oxygen consumption rates. For stressed yeast (high ethanol, osmotic, or temperature stress), we measure trehalose content, reactive oxygen species (ROS) levels, and mitochondrial membrane potential to gauge sublethal injury. We can detect viability differences as low as 0.5% and resolve activity on a minute‑by‑minute scale.
Advanced Capabilities for Any Yeast Strain
Whether you work with Saccharomyces cerevisiae, Kluyveromyces marxianus, Pichia pastoris, or non‑conventional yeasts, our methods are adapted to each. We perform automated cell counting with image analysis on millions of cells per sample, eliminating subjective errors. For industrial fermentation monitoring, we offer in situ viability sensors and flow‑through cytometric modules that can be integrated into your production line. In research settings, we combine transcriptomic analysis of stress‑response genes (e.g., HSP12, SOD1, CTT1) with enzymatic activity assays (hexokinase, alcohol dehydrogenase) to reveal the molecular basis of viability loss or recovery.
What You Receive – Beyond a Number
Your final report includes: total cell count, viable count, viability percentage, metabolic activity index (based on glucose‑induced acidification or CO₂ production rate), lag phase duration, specific growth rate, and fermentation robustness score. For dry yeast, we simulate rehydration stress and measure membrane integrity recovery over time. For frozen or liquid yeast stocks, we provide cryotolerance profiles and predictive shelf‑life modeling using Arrhenius equations. All tests are performed in triplicate with positive and negative controls, following ISO 20391-1:2018 standards where applicable.
Our Distinct Advantages in Yeast Activity Testing
1. Speed and throughput: We can process up to 96 samples simultaneously using robotic liquid handling and multi‑plate readers, with results delivered in 24‑48 hours for routine assays. 2. Stress simulation: Our bioreactors mimic your exact process conditions (temperature, pH, osmotic pressure, ethanol concentration) so viability data is truly predictive. 3. High‑risk strain support: We work safely with GMO yeast and pathogenic yeasts (e.g., Candida species) in our BSL‑2 certified lab. 4. Custom method development: If you have a non‑standard matrix (beer with hops, wine with sulfites, dough, silage, probiotic capsules), we design a validated protocol to extract and measure yeast activity without interference. 5. Regulatory ready: Our data packages are accepted for quality release, process validation, and patent applications.
Why You Should Choose Us Over Standard Labs
Most routine labs only give you a viability percentage from a single dye. We give you the physiological landscape of your yeast population. We have successfully helped breweries reduce fermentation stalls, bakeries extend dough‑proofing consistency, and biofuel plants optimise inoculum age. Our scientists provide one‑on‑one interpretation and actionable recommendations, such as optimal pitching rates, nutrient supplementation, or harvest timing. No hidden interpretation fees – we walk you through every data point.
Get Started with Your Yeast Activity Test Today
Don't let uncertain viability compromise your product quality or fermentation yield. Contact our team to schedule a sample submission. We accept fresh, dried, frozen, or immobilized yeast samples. Initial consultation is free, and we offer a discounted pilot test for first‑time clients. Let us show you what true yeast vitality looks like – with precision, depth, and speed.