Every food that reaches our table goes through a long process before being consumed. From the selection of raw materials to their transformation into consumer-ready products, every stage requires meticulous control. Ensuring that food is safe, nutritious, and of high quality is no accident: it is the result of rigorous procedures that include the detailed study of its properties. In this context, physicochemical analyses are essential tools for food production.
At Cosmos Aromática, we work on the design and production of flavourings and aromatic solutions for the food industry, collaborating with R&D, quality, and production teams to develop stable, reproducible profiles adapted to each matrix and process. Throughout this article, we explain the purpose of physicochemical analyses and their importance in food production.
Why physicochemical analyses are critical in a food plant
Physicochemical analyses are integrated into a control system that helps to maintain the product within specification and to reduce operational risks. When a batch deviates, it is rarely due to a single cause: it could be a variable raw material, a change in temperature, insufficient mixing, a shorter drying stage, fermentation progressing faster than planned, or packaging that does not provide the same level of protection.
Physicochemical analyses provide three clear advantages:
- Process control: detecting deviations before they turn into rejections, reworks, or downtime.
- Raw material control: managing variations and adjusting formulations or process conditions with sound judgment.
- Technical evidence: documenting compliance with internal and client requirements, with full traceability.
What objectives do physicochemical analyses pursue?
The objectives can be organised in a practical way, keeping the day-to-day factory operations in mind. In all of them, physicochemical analyses act as sensors that translate what is happening in the process into comparable figures.
Ensuring stability and shelf life
Many shelf-life problems are anticipated using parameters such as water activity, moisture, pH, acidity, peroxide value in fats, or colour changes. If a parameter drifts from batch to batch, something in the process is changing.
Maintaining consistent sensory quality
Texture, succulence, crunchiness, stable emulsion, or the absence of phase separation are usually connected to measurable variables: fat content, protein, soluble solids, viscosity, particle size, or water-holding capacity. Physicochemical analyses allow perceivable characteristics to be linked with the parameters that can be modified.
Reducing waste and reworks
Precise control of the end point of each stage makes it possible to avoid exceeding or falling short of the desired target. For example, insufficient drying can increase moisture and trigger subsequent incidents; excessive thermal treatment can affect colour or functionality. Measuring accurately avoids correcting too late.
Verifying technological functionality
In food production, many raw materials are chosen for their function: to emulsify, gel, thicken, stabilise foam, or provide structure. Physicochemical and rheological tests help to check if that functionality is maintained across different suppliers, batches, and real-world conditions.
Supporting continuous improvement
Data opens the door to optimisation: adjusting times, temperatures, addition order, stirring speed, homogenisation pressure, or intermediate storage conditions. With historical series, physicochemical analyses allow a distinction to be made between normal variation and a real process change.
Where they are applied in the production flow
Typical control points are usually located in:
Raw materials intake
The aim here is to confirm identity, condition, and variability: moisture, fat, protein, pH, ash, density, soluble solids, or functional properties as appropriate. Good reception control prevents the problem from entering the line.
In-process control
Rapid measurements on the line or in the plant laboratory to decide whether to proceed to the next stage: pH in fermentation, soluble solids during concentration, viscosity in mixtures, salinity, conductivity, or moisture control during drying.
Finished product release
Final verification of internal specifications and client requirements. In many cases, the analytical data is combined with sensory controls, weight, sealing, and documented operational parameters.
What are the basic parameters in a physicochemical analysis?
Although each food category has its own particularities, there is a set of base parameters that appear in most plants.
Moisture and dry matter
What it indicates: Water availability in the product and, in many cases, stability. Why it matters in production: It affects texture, yield, cost per kilo, stability, and storage behaviour. Process notes: Changes in drying, baking times, evaporation, or absorption can be quickly reflected here.
Water activity (aw)
What it indicates: How much water is “free” for reactions and microbial growth (this is not the same as moisture). Why it matters: Stability, microbiological risk, and texture (for example, loss of crunchiness). Typical use: Snacks, bakery, dehydrated products, confectionery, products with a fat phase, and long-life foods.
pH and acidity
What it indicates: Acid-base balance and, depending on the case, the progress of fermentation or the impact of ingredients. Why it matters: Safety, stability, flavour, and functionality of proteins or hydrocolloids. In the plant: It is used to control cut-off points in fermentation, formulation adjustments, or emulsion stability.
Soluble solids (°Brix)
What it indicates: Approximate concentration of dissolved solutes (widely used in aqueous matrices). Why it matters: Consistency of syrups, beverages, sauces, and concentrates; impact on perceived sweetness and viscosity. In process: Control of concentration, evaporation, or mixing.
Fat, protein, and ash content
What they indicate: Basic composition and technological profile. Why they matter: Yield, nutritional value, functional behaviour, and batch consistency. In production: They help to adjust formulations, detect out-of-range raw materials, and maintain homogeneity.
Salinity or chlorides
What it indicates: Salt level and, in some products, stability and flavour. Why it matters: Product standard, sensory perception, and process control (brine, curing, formulation).
Colour (instrumental)
What it indicates: Changes due to oxidation, browning reactions, thermal treatment, or raw material variation. Why it matters: Client acceptance and visual consistency. In the plant: Useful for monitoring roasting, cooking, oxidation, or ingredient deviations.
Viscosity and rheological behaviour
What it indicates: How the product flows and how it responds to mixing or pumping stress. Why it matters: Filling, stability, mouthfeel, and batch-to-batch consistency. In production: Highly relevant in sauces, creams, dairy products, thick beverages, or emulsions.
What equipment is required to perform advanced physicochemical analyses?
When basic control is not enough (due to client demands, process complexity, or the need to investigate causes), more advanced techniques and equipment appear.
Instrumentation for rapid composition and characterisation
Spectroscopy (e.g. NIR)
Used for rapid estimations of composition parameters in certain matrices (moisture, fat, protein, or others, depending on calibrations). Its value lies in its speed and support for decision-making in reception and processing, provided calibrations are well maintained.
Automatic moisture analysers
When time is of the essence, rapid-reading equipment is used to support immediate adjustments in drying, baking, or mixing.
Equipment for stability, texture, and structure
Advanced rheometers and viscometers
These allow an understanding of whether a product is pseudoplastic, thixotropic, or if its structure changes over time. This impacts pumping, mixing, filling, and final texture.
Texture analysers
They help to correlate process parameters with bite, firmness, elasticity, or fracture. In production, they can serve to standardise processes when sensory criteria are not enough.
Equipment for fat and oxidation control
Measurement of oxidation and fat stability
Determinations related to oxidation are key in products with a fat phase (snacks, sauces, nuts, preparations). The industrial interest is to avoid rancidity and protect shelf life.
Equipment for detailed separation and quantification
Chromatography (GC/HPLC)
Used when it is necessary to separate and quantify compounds: fatty acid profiles, sugars, organic acids, volatile aroma compounds, or process markers. In production, it usually comes into play when confirming causes, comparing suppliers, or validating changes.
Spectrometry (coupled according to the method)
Applied in contexts where identification and quantification require high selectivity. Its use is common in laboratories with complex analytical needs.
Infrastructure and technical support of the laboratory
In addition to the “main” equipment, the reliability of physicochemical analyses depends on:
- Internal calibrations and verifications.
- Reagents and reference materials when the method requires them.
- Suitable balances, temperature control, and good sampling practices.
- Cleaning procedures and prevention of cross-contamination in the laboratory.
Data that turns into control
Physicochemical analyses are a practical part of production control: they allow raw materials to be understood, critical stages to be monitored, the product to be kept within specification, and batch-to-batch quality to be sustained. When designed with real plant decisions in mind, they become an operational advantage: less variation, less rework, and more stability.
To apply physicochemical analyses with a truly useful approach for production (reception, process, and release), at Cosmos Aromática we help you define which parameters make sense for your line and how to turn the results into clear control criteria. Get in touch with us for a technical consultation, and we will review your case.