Total Sugars Analysis in Food and Feed

Total sugars refer to the sum of all simple carbohydrates present in a sample, including monosaccharides and disaccharides. These sugars may occur naturally or be added during processing.
Common sugars measured in total sugar analysis include glucose, fructose, sucrose, lactose, maltose, and trehalose. These sugars are readily digestible and provide a rapid source of energy in both food and feed.
In nutritional analysis, total sugars are used to evaluate carbohydrate composition, product quality, and energy contribution.

Total sugar content plays an important role in both nutritional value and product functionality.
In animal nutrition, sugars contribute to:
‣ Rapid energy supply
‣ Palatability and feed intake
‣ Fermentation and microbial activity (particularly in ruminants)
‣ Variation in digestion depending on sugar type and inclusion level

In human nutrition, sugars contribute to:
‣ Energy supply
‣ Glycaemic response
‣ Sweetness and flavour
‣ Functional properties in processed foods
Because of this, accurate sugar measurement is important for formulation, quality control, and regulatory compliance.

Sugars can be classified into two main groups based on their structure:
Monosaccharides
Monosaccharides are single sugar units that do not require further digestion before absorption.
Common examples include:
‣ Glucose
‣ Fructose
These sugars are rapidly absorbed and contribute directly to blood glucose levels.
Disaccharides
Disaccharides consist of two monosaccharide units linked together and must be broken down before absorption.
Common examples include:
‣ Sucrose (glucose + fructose)
‣ Lactose (glucose + galactose)
‣ Maltose (glucose + glucose)
‣ Trehalose (glucose + glucose)
Trehalose is a more stable disaccharide compared to others and is found in certain plants, fungi, and microorganisms. It is less reactive in browning reactions and is digested more slowly than some other disaccharides, which can influence its functional and nutritional behaviour.

Sugars are rapidly digested and absorbed in the small intestine, providing a quick source of energy.
In feed, sugars also play an important role in fermentation processes, particularly in ruminants, where they support microbial growth and activity. However, excessive sugar levels can disrupt the balance of fermentation and negatively affect animal performance.
In food, sugars contribute to flavour, colour development, and texture. They are involved in browning reactions, such as caramelisation and the Maillard reaction, which are important in many processed products.

Total sugar analysis is typically performed using chromatographic or enzymatic methods.
Common approaches include:
‣ High-performance liquid chromatography (HPLC) for individual sugar profiling
‣ Enzymatic assays for total sugar quantification
These methods allow accurate measurement of both individual sugars and total sugar content across a wide range of food and feed matrices.

Total sugar testing is routinely performed in food and feed laboratories to assess product composition and quality.
It is commonly used alongside other parameters such as starch, fibre, and protein to provide a complete nutritional profile. Total sugar analysis supports formulation decisions, process control, and compliance with labelling requirements.