Yes – but not consistently. Bioactive stability is influenced by heat, time, pH, oxygen, and water chemistry. According to a study from 2026, a 1-hour exposure of EGCG to 80 °C showed a decrease in its retention from 38.4% in distilled water to 1.4% in mineral water; meanwhile, acidification retained 95% of it. This means that strong herbal extract bioactive stability needs to be achieved through optimized extraction and formulation and checked with the help of functional beverage stability testing.
Do Herbal Extracts Lose Their Bioactives in Hot vs Cold Beverages, and How Do You Formulate Around It?
Dr Radhika Ganesan, R.D., PhD, Head of Regulatory Affairs & Nutrition Science, Food Research Lab
Fifteen-plus years formulating functional foods, botanicals and nutraceuticals — extraction optimisation, stability engineering and claim substantiation.
Quick Answer
Yes – but not consistently. Bioactive stability is influenced by heat, time, pH, oxygen, and water chemistry. According to a study from 2026, a 1-hour exposure of EGCG to 80 °C showed a decrease in its retention from 38.4% in distilled water to 1.4% in mineral water; meanwhile, acidification retained 95% of it. This means that strong herbal extract bioactive stability needs to be achieved through optimized extraction and formulation and checked with the help of functional beverage stability testing.
Introduction
The global functional beverage market is projected to reach USD 181.65 billion in 2026 and is expected to register a 9.39% CAGR during 2026-2034 due to increasing demand for health-oriented beverages. Herbal functional beverages belong to a rapidly growing submarket. [1]
For product developers, stable herbal extracts that can retain their bioactivity throughout the production process and storage period. Herbal extract bioactive stability depends on temperature, time, pH, water chemistry, oxygen, light, and ingredient interactions. Beverage formulation science integrates these factors into hot vs cold beverage formulation to maintain bioactive dose and finished-product stability.
How Heat and Cold Affect Herbal Extract Bioactives
Temperature is an important parameter, but its effect is relative to the extraction process used. A 2025 Food Chemistry study found that among the conditions tested, a combination of 85 °C and a 30-minute duration was ideal for the extraction of polyphenols from finely powdered green tea leaves, while a combination of 20 °C and 12 hours with whole leaves had good antioxidant activity and better extraction yield of epicatechin and epigallocatechin yields than the high-temperature methods tested. Results varied with raw-material format. [2]
Therefore, while cold-brew botanical extraction can minimize thermal exposure, it does not necessarily mean that extraction can be enhanced. Temperature, duration, particle size and purity of water must be considered as a combined effect. A 2026 study also found that heating for 1 hour at 80 °C decreased the retention rate of EGCG, highlighting how catechin degradation can vary with water chemistry and processing conditions. [3]
For herbal formulation, the key question is not simply “hot or cold?” but which temperature-time-matrix combination reliably delivers the target active?
Figure 1. Formulation runs backwards from the claim: the target bioactive and dose determine the extraction and process, which then determine the stabilisation and packaging strategy.
Key Bioactive Compounds Requiring Processing Control
The actives are different, and hence herbal product development needs to be specific to individual compounds and not depend on a universal processing principle. [3]
Table 1. Key Bioactive Compounds and Their Temperature Sensitivity in Herbal Beverages
Bioactive class | Behaviour during processing | Formulation signal |
Catechins (green tea) | Sensitive to temperature, time and matrix; 80 °C heating caused major EGCG loss, while acidification retained ~95%. | Optimise time–temperature; control pH and water chemistry. |
Anthocyanins (hibiscus, berries) | Thermally sensitive; hibiscus degradation followed first-order kinetics at 60–90 °C (~54 kJ/mol activation energy). (Journal of Food Science, 2025) | Control temperature, time and pH; consider protective carriers. |
Essential oils/volatiles (mint, lemongrass) | Prolonged open heating causes evaporation and oxidation. | Use closed processing; add late. |
Curcuminoids (turmeric) | Poor water solubility limits performance; carriers improve thermal and oxidative stability. | Encapsulate or emulsify. |
Primary Causes of Bioactive Degradation
The following factors may cause bioactive loss: temperature, time, pH, oxygen, light, water chemistry and interaction between ingredients. Recent studies of herbal beverages highlight that physicochemical stability and delivery system design have become important factors in the formulation process.
Instead of using a general bioactive degradation temperature, it is recommended to define the process window for the desired active ingredient and matrix by means of a thermal degradation kinetics and stability testing. [4]
Match the Right Extraction & Stabilisation to Your Claim
Food Research Lab designs botanical extraction, herbal formulation, encapsulation and stability programmes to help brands develop stable, specification-ready functional beverages.
Formulation Strategies for Hot vs Cold Beverage Applications
Effective hot vs cold beverage formulation starts with the target active and moves backwards to the process.
Protecting Polyphenols During Thermal Processing
During thermal processing of herbal extracts, it is necessary to control the total thermal load and not just select the lowest temperature.
After 1 hour at 80 °C, EGCG retention ranged from 38.4% in distilled water to 1.4% in mineral water, while acidification maintained approximately 95% retention. [3] This demonstrates the impact of pH and water chemistry on polyphenol stability.
Where thermal sensitivity or solubility is limiting, encapsulation and emulsion-based systems can help protect bioactive and improve functionality.
Figure 2. EGCG retention after 1 hour at 80 °C and formulation strategies for protecting herbal bioactives. Source study: Mika, M., & Wikiera, A. (2026), Food Chemistry, 527, 150884.
Modern Stabilization Technologies for Herbal Product Formulation
Modern herbal product formulation may help in solving issues of botanical extract solubility and their bioactive stability, depending on the botanical and beverage matrix:
- Spray-dried encapsulation along with suitable wall materials;
- Nanoemulsions and other delivery systems;
- pH optimization;
- Oxygen control;
- Extraction conditions control;
- Light and oxygen barrier packaging.
Hybrid extraction, such as controlled mild heating followed by cold extraction, can be considered, as it allows extraction of more bioactives without long-term thermal processing. [4]
Stability Testing Methods for Functional Beverages
The formula is de-risked only when the finished beverage is being tested. Functional beverage stability testing should combine real-time storage under intended conditions with scientifically justified accelerated studies suited to the product and package.
The testing should focus on measuring target marker compounds using validated techniques such as HPLC, and the pH level, colour, turbidity or precipitation, sensory and microbiological properties. The Shelf-life stability testing should provide evidence that the target bioactive compound remains within specification throughout the claimed shelf life. [5] [6]
Declare the active level that survives to the end of shelf life, not what you extracted on day one. Build formulation overage from stability data, confirm pH, oxygen and ingredient compatibility, and verify the finished product before locking the claim and artwork.
Stabilising a Cold-Brew Green Tea Tonic
Challenge: A client beverage manufacturer required a cold brew green tea tonic with stable catechins, clean taste and bright colour to be distributed ambiently.
Approach: FRL benchmarked cold-brew botanical extraction at 20°C for 12 hours against controlled hot extraction and then optimised the pH, water chemistry and oxygen exposure in order to increase EGCG stability.
- ~95% EGCG retention demonstrated under optimised acidic conditions
- Cold extraction optimised at 20 °C for 12 hours
- pH and water chemistry controlled for improved stability
- Catechin retention validated by HPLC through shelf-life testing
Outcome The optimised process established a strategy focused on improving catechin retention and visual stability for ambient distribution.
Key Takeaway FRL optimised the temperature–time–pH–water matrix together to maintain catechin stability rather than relying on cold brewing alone.
From Extraction to Shelf-Life Stability
The right botanical process depends on the active, matrix, processing conditions and target claim. Food Research Lab supports herbal product development, extraction, formulation, encapsulation and functional beverage stability testing.
Conclusion
Bioactive stability in herbal products is affected by a combination of compound characteristics, temperature, time and processing environment, making formulation a complex optimization task that isn’t as simple as choosing between hot and cold. Strong herbal extract bioactive stability requires integrated extraction, stabilization, packaging and shelf-life testing to preserve the target dose.
Food Research Lab supports brands with herbal product development services, extraction optimisation, herbal formulation, encapsulation and stability programmes for botanical beverages across India, the UK, EU and GCC.
Frequently Asked Questions
It can, depending on the nature of the bioactive compound, temperature, heating time, pH and beverage matrix. Heat processing may result in lower retention of EGCG under certain conditions.
Not necessarily. Cold extraction reduces thermal exposure but may affect extraction yield, solubility and stability. The best approach depends on the botanical, raw material and target claim.
Optimise extraction temperature and time, control pH and oxygen, address solubility, use encapsulation where appropriate, and validate the finished beverage through stability testing.
References
- Fortune Business Insights. (n.d.). Functional beverages market size, share & industry analysis. https://www.fortunebusinessinsights.com/industry-reports/functional-beverages-market-101625
- Oracz, J., Królak, K., Kordialik-Bogacka, E., & Żyżelewicz, D. (2025). Optimizing brewing conditions for low-temperature green tea infusions: Insights into functional and nutritional properties. Food Chemistry, 474, 143241. https://doi.org/10.1016/j.foodchem.2025.143241
- Mika, M., & Wikiera, A. (2026). Brewing conditions and post-brewing handling shape the catechin profile and stability of tea infusions. Food Chemistry, 527, 150884. https://doi.org/10.1016/j.foodchem.2026.150884
- Awlqadr, F. H., Qadir, S. A., Altemimi, A. B., et al. (2026). Innovations in herbal functional beverages: From green formulation and bioactivity preservation to sensory optimization and regulatory safety. Food Science & Nutrition, 14(5), e71776. https://doi.org/10.1002/fsn3.71776
- Mahey, P., Sharma, M., Sontakke, M., Gupta, A. K., Jha, A. K., & Khan, J. M. (2025). Development of functional beverage using pineapple juice and Bougainvillea spectabilis flower powder: Effect on the quality and storage stability. Journal of Stored Products Research, 112, 102587. https://doi.org/10.1016/j.jspr.2025.102587
- Bashir, S., Hussain, S. Z., Jan, N., Naseer, B., Dhekale, B., Alam, T., Jeelani, S. M., & Mir, J. I. (2025). Physicochemical characteristics, antioxidant capacity, bioactive compounds, and microbial stability of saffron-based functional beverage stored in glass bottles with and without secondary packaging at ambient conditions. Applied Food Research, 5(2), 101474. https://doi.org/10.1016/j.afres.2025.101474
📑 Table of Contents
- Introduction
- How Heat and Cold Affect Herbal Extract Bioactives
- Key Bioactive Compounds Requiring Processing Control
- Formulation Strategies for Hot vs Cold Beverage Applications
- Modern Stabilization Technologies for Herbal Product Formulation
- FRL Case Study — Diagnosing Oxidative Shelf-Life Failure
- Conclusion
- Frequently Asked Question
- Reference
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