Inulin is a polysaccharide found naturally in plants such as chicory, onion, garlic, etc. Guanjie Biotech's bulk inulin powder is from chicory and inulin. It is a healthy dietary fibre and functional ingredient. It has a variety of functional roles in baked goods. These include improving texture, enhancing nutritional value and extending shelf life. The role of Inulin in baking will be explored in detail below from several perspectives.
The degree of polymerisation (DP) of Inulin usually ranges from 2 - 60. Different degrees of polymerisation affect the physical and chemical properties. In general, oligomeric Inulin (DP 2 - 9) has a better prebiotic function and can be utilised by beneficial intestinal bacteria. Inulin with a higher degree of polymerisation, on the other hand, exhibits different properties, e.g. in food processing.
Physical Properties and Baking Correlation
• Solubility
Inulin has good water solubility. When Inulin is dissolved in the water of a dough or batter, it can change the rheological properties of the system. For example, when making bread dough, this makes the dough softer. It absorbs and retains moisture, preventing the dough from drying out too quickly during the baking process and helping to form a better bread organisation.
Moreover, Inulin can disperse evenly in baking ingredients. Compared with some other insoluble fibres, Inulin does not produce a rough texture.
• Sweetness and flavour
Bulk inulin powder has a certain sweetness. Its sweetness is about 10% - 30% of sucrose. In baking, it can be used as a partial substitute for sucrose to provide some sweetness. This helps to reduce the calorie and sugar content of baked goods. For example, in the production of low-sugar biscuits, the addition of Inulin can give the biscuits a certain sweetness while reducing the amount of sucrose used.
Inulin itself has virtually no specific off-flavours and does not mask the original flavours in the baked product. For example, chocolate flavour, vanilla flavour, etc. On the contrary, in some cases, it can also complement the flavours of other ingredients and act as a flavour enhancer. For example, when making bakery products with fruit fillings, the presence of Inulin can better bring out the natural sweetness and flavour of the fruit.
• Gel properties
When an Inulin solution is subjected to the right conditions (e.g. high enough concentration, temperature change, etc.), a gel can be formed. In baking, it can be used to improve the texture of products. For example, when making jelly cakes or pudding-type bakery products, Inulin gel can be used as a natural gelling agent, replacing traditional gelatin or agar, etc. Inulin gel has good elasticity and stability. It can keep the cake in good shape and is not easy to deform during storage. The formation of insulin gel can also be used for wrapping fillings, such as in the production of sandwich breads or pastries, where the gel-like insulin prevents the fillings from flowing out and improves the quality and appearance of the product.
Chemical properties and baking relevance
• Stability
Pure Inulin powder has good thermal stability at normal baking temperatures. It does not decompose or produce harmful substances during baking. It maintains its chemical structure and function at high temperatures. Examples include its gel properties and dietary fibre functionality. This stability allows Inulin to be used in a wide range of baking processes, whether it is traditional oven baking or newer high-temperature rapid baking methods. Inulin is also resistant to acidic and alkaline environments. Inulin can function properly in baking recipes that contain acidic or alkaline ingredients. It does not lose its function due to acid-base reactions, such as in lemon cake or soda biscuits.
• Interactions with other ingredients
Inulin can interact with proteins. In dough, Inulin can bind to gluten proteins, affecting gluten formation and dough elasticity. The right amount of Inulin can strengthen the gluten network and make the dough more resilient, thus helping products such as bread retain their shape during baking and have good volume expansion. For example, when making staple bread, the addition of Inulin can lead to a finer and more uniform internal organisation of the bread.
Bulk inulin powder also interacts with starch. It slows down the ageing of starch. This is important for maintaining the softness and freshness of baked products. In products such as biscuits and cakes, starch ageing can lead to hardening and poor texture. For example, when making biscuits with a long shelf life, the addition of Inulin allows the biscuits to maintain a better texture even after prolonged storage.
Specific roles in bakery products
1. Bread
• Volume and organisation
Inulin increases the volume of bread. During the fermentation of bread dough, Inulin provides an additional carbon source for the yeast. The yeast can utilise the fructose units in Inulin for fermentation, producing carbon dioxide gas. These gases form bubbles in the dough. It causes the dough to expand, thereby increasing the volume of the bread. At the same time, the interaction of Inulin with gluten proteins strengthens the gluten network, which is better able to encapsulate the gases produced by fermentation and prevent them from escaping. As a result, the internal organisation of the bread is more loose and porous. For example, in wholemeal bread making, the addition of Inulin can improve the problem of insufficient gluten formation in wholemeal flour, so that the volume and internal structure of bread can be optimised.
From the microstructure point of view, the internal pore distribution of the bread after the addition of Inulin was more uniform. This is because the presence of Inulin makes the rheological properties of the dough more stable. During fermentation and baking, the growth and merging of air bubbles were more orderly. This uniform pore structure not only gives the bread a better appearance but also a softer, more delicate texture.
• Preservation of freshness and anti-ageing
As mentioned earlier, Jerusalem Artichoke Inulin Powder can slow down the ageing of starch. In bread, starch ageing is one of the main causes of hardness and texture deterioration. Inulin forms a complex with starch molecules, which interferes with the orderly arrangement of starch molecules, thus slowing down the regeneration process of starch. This allows the bread to remain soft for a longer period during storage. Studies have shown that the increase in hardness after 2 - 3 days of storage of Inulin-added bread is significantly less than that of non-Inulin-added bread. This preservation effect reduces bread wastage.
2. Cakes
• Texture and mouthfeel
Inulin improves the texture of cakes. In the cake batter, Inulin can absorb water and make the batter thicker. During the baking process, this thicker batter can better maintain the shape of the cake and prevent it from collapsing. At the same time, the gel property of Inulin also affects the texture of the cake to a certain extent. It can make the inside of the cake firmer but not too soft. For example, when making a sponge cake, adding Inulin can give the cake a more elastic texture.
Inulin can also affect the taste of a cake. Because it has a certain sweetness, it is possible to reduce the amount of sucrose and still give the cake a certain sweetness. Moreover, insulin does not produce a sticky feeling like sucrose. In addition, Inulin improves the moisturising properties of the cake, which makes the cake more moist when consumed without a dry mouth.
• Stability and shelf life
The presence of bulk inulin powder improves the stability of the cake. During the transport and storage of the cake, Inulin prevents the cake from deformation due to vibration or temperature changes. Its gelling properties and interaction with starch can give cakes a more solid structure. In terms of shelf life, Inulin's ability to retard starch ageing also applies to cakes. It can keep the cake fresh in taste for a longer period, extend the shelf life of the cake and reduce the loss caused by deterioration.
3. Biscuits
• Forming and structural integrity
Inulin can be used as a binder in biscuit dough production. Due to its solubility and viscosity, Inulin can make the various ingredients in the biscuit dough work better together. This is important for biscuits with complex shapes, and Inulin ensures that the dough does not fall apart during the moulding process. During the baking process, Inulin enhances the structural integrity of the biscuit, preventing it from breaking or shattering. For example, when making soda biscuits, Inulin gives the biscuits a neater edge and a smoother surface.
• Taste and flavour
Inulin bulk powder improves the texture of biscuits. It makes biscuits crispier. This is because Inulin can absorb moisture during baking and form a certain hollow structure, creating a crispy sensation when the biscuit is bitten. At the same time, the sweetness of Inulin can be matched with other flavours in the biscuit. When making savoury biscuits, the slight sweetness of Inulin acts as a flavour balancer. Moreover, Inulin does not produce burnt bitterness after baking at high temperatures as other sweeteners do, ensuring a good flavour in the biscuit.
Inulin has several important roles in baking. It can improve the texture, mouthfeel, volume and organisation of products with excellent performance. At the same time, the use of Inulin requires scientific control of its addition and processing to achieve the best results.Guanjie Biotech is an Inulin supplier. If you need to add bulk inulin powder to your products, please feel free to contact us at info@gybiotech.com.
