The Scent of Food Freshness

The Scent of Food Freshness


Our homes are becoming increasingly connected and smarter – whether it is smart locks, lighting, appliances, or home security. At the heart of this connectivity are an increasing number of Internet-of-Things (IoT) devices that connect to our Wi-Fi networks to provide the eyes, ears, touch, hands, and legs to our devices. These devices have enhanced our perception of the world around us and augmented our senses in unprecedented ways, consequently, they are helping us live safer and helping us make smarter choices.

In our continued pursuit of improving our everyday experience, there is one more human sense that has yet to be integrated into our connected devices – the sense of smell.


The attached graph shows the distribution, in Canada, of the avoidable food loss and waste (FLW). A whopping 21% or 2.4 million tons of food worth more than $10 billion is lost at the consumer level. This waste can be easily reduced.

Two ways in which we can prevent food wastage at the consumer level are:

A) Ensuring proper refrigeration to prevent spoilage

B) Establishing a standardized way to confirm when food should be consumed promptly or processed immediately (ex. cooked and frozen) for later consumption. This is where scent digitization is changing the landscape.

Tonnage and percentage of unplanned, post-processing (avoidable), potentially-edible

Source:  Gooch et al (2019). The Avoidable Crisis of Food Waste: Technical Report;
Value Chain Management International and Second Harvest; Ontario, Canada.


Stratuscent’s electronic nose (eNose) technology, when integrated into modern smart refrigerators, enables us to verify that the food we are consuming is fresh and safe. Additionally, the eNose can smartly regulate the air cycles in the refrigerator to provide the right balance between food freshness and energy savings. This ensures that we and our families are consuming food in the safest way possible.

Taking this a step further, our eNose makes the age-old saying “one bad apple spoils the bunch” exactly that – age old. Through its predictive artificial intelligence (AI) algorithms, the eNose can identify precursors to food spoilage and alert us at the first sign of spoilage, so that we can throw away that one bad apple and save the rest of the bunch.

Stratuscent's eNose

Stratuscent’s eNose is paving the way
to food waste reduction


Stratuscent’s eNose can detect food spoilage because at its heart is a proprietary chemiresistive array that can sense all the volatile organic compounds (VOCs) that are associated with food deterioration. Specifically, when specific types of food spoil, the following volatile chemicals are released:

Spoiled fish: amines
Spoiled meat: sulfides

Over-ripe fruits: ethylene
Spoiled dairy: butyric acid

Since our eNose can detect these (and more) VOCs in trace amounts, it can easily detect the initial signs of food spoilage. With its 32-element sensing array that is designed to be sensitive to the various chemical functional groups combined with AI algorithms, our eNose can track and trace the evolution of complex scents and VOCs. This allows the eNose to detect how fresh, pure, or ripe certain foods are in a continuous manner.

Stratuscent’s eNose installed inside a refrigerator

Stratuscent’s eNose installed inside a refrigerator


Furthermore, by combining the digitized “smell” of the air quality inside the refrigerator and the readings from its own onboard temperature and humidity sensors, our eNose can also optimize the air and refrigerant cycling of the refrigerator to find the right balance between food freshness and energy savings.


Bio-Inspired Tech

Stratuscent’s eNose is based on technology that was developed at NASA’s Jet Propulsion Lab (JPL) and installed in the International Space Station. After obtaining perpetual worldwide licensing rights to patents, Stratuscent has improved and optimized the end-to-end system to provide real-time environmental intelligence.


At the core of Stratuscent’s eNose is a 32-sensing-element chemiresistive array targeted towards the various functional groups of Volatile Organic Compounds (VoCs). As the scent flows over this array, the impedance of the sensing elements changes to create a scentprint unique to each scent. This scentprint is continuously captured and relayed to the cloud for interpretation. Thus, Stratuscent’s proprietary chemo-scent receptors respond holistically to a scent.

Bio -inspired artificial intelligence


Much like how our olfactory system works, the signal from the sensor (the “nose”) is sent to the AI-enabled cloud (the “brain”) for processing. Using proprietary machine learning techniques, the AI engine is able to not only detect the differences between different scentprints (e.g. lavender versus citrus) but also able to detect changes in the scentprints over time (e.g. during cooking) in various humidity and temperature conditions and in the presence of complex background scents.


In a true bio-mimicking fashion, just like how we don’t switch our noses between smelling flowers and wines, Stratuscent’s solution doesn’t require different eNoses for different aromas. Leveraging the capabilities of the Microsoft Azure cloud, the same eNose unit can be remotely upgraded with improved capabilities or additional target aromas. Moreover, Stratuscent’s eNoses continually learn from all the other eNoses.

Contact Stratuscent to learn more.