Shelf Life and Storage Conditions of Carob Products
Carob products are generally low-moisture and durable products; however, the risk threatening the shelf life of each is different. Moisture absorption and clumping in powder products, insect infestation and mold in broken and fruit, and HMF formation that increases with time and temperature in molasses come to the fore.
In this article, we discuss the storage conditions for carob powder, crumbs, molasses, seeds, and gums, the scientific factors that determine its shelf life, and practical measures that can be applied both at home and in storage.
Key Factors Determining Shelf Life
The shelf life of a food is the period during which it maintains its safety and expected quality characteristics when stored under specified conditions. The main factors that determine this period in carob products are as follows:
| Moisture and water activity | The product's absorption of moisture from the environment increases the risk of clumping, mold and infestation. |
| Temperature | High temperature accelerates chemical changes (browning, HMF formation, loss of flavor). |
| Light and oxygen | It can contribute to the degradation of color and flavor components. |
| Pests | Sugar-rich dry products attract the attention of warehouse pests. |
| Packaging | Its barrier feature against moisture, air and pests directly affects shelf life. |
Water activity (aw) is a measure of how much water in a product can be "used" by microorganisms and chemical reactions, and is different from the total amount of moisture. For example, although molasses contains a significant amount of water, most of this water is bound due to its high sugar concentration. Carob powder, on the other hand, contains very little water; however, it can quickly absorb moisture when it comes into contact with humid air.
Determining the shelf life and displaying it correctly on the label is the responsibility of the food business operator in Turkey. The Ministry of Agriculture and Forestry, General Directorate of Food and Control has published a guide emphasizing the need for food operators to determine shelf life correctly within the scope of reducing food loss and waste, and a brochure explaining the difference between Expiry Date (STT) and Recommended Consumption Date (TETT) (Ministry of Agriculture and Forestry, 2023). Therefore, the most reliable information for each product is the date and storage conditions specified on the packaging.
Carob Powder and Flour
Carob powder is a product prone to moisture absorption due to its natural sugar content and large surface area. The relationship of powdered products with moisture forms the basis of the most common clumping and hardening problems in storage.
Examining the effect of grinding time on the properties of carob powder, Červenka et al. (2022) reported that as the particle size decreases, the equilibrium moisture content of the powder increases. In other words, the finer ground powder tends to retain more moisture under the same ambient conditions. The same research group also examined the thermodynamic properties and glassy transition temperature of roasted and unroasted carob powder (Červenka et al., 2019); such studies are the basis for understanding under what humidity and temperature conditions the powder begins to become sticky and clump.
Roasting also affects storage behavior. In a study conducted in Turkey, Gunel et al. (2018) showed that as roasting time and microwave power increased, the moisture content and water activity of carob powder decreased, while browning and heat treatment products such as HMF increased. This indicates that the roasted powder was initially drier, but roasting itself had a chemical price.
Practical storage tips for powder and flour:
- Store in a tight-sealed, moisture-proof container.
- Choose a cool, dry location out of direct sun; keep it away from the stove and oven.
- Do not insert a wet spoon into the container; a damp spoon can initiate clumping.
- Once the package is opened, consume it in a reasonable time if possible.
- Light clumping is most often related to moisture; however, do not use the product in the presence of a musty smell, discoloration, or insects.
For details on the fineness and quality of powder products What is Carob Flour Powder? You can take a look at our article.
Carob Kibble (Kibble) and Dried Fruit
Because the broken and whole fruit is in larger pieces than the powder, it has less surface area per unit weight and absorbs moisture more slowly. Drying after harvest is the basis of the durability of these products. The Feedipedia database states that pods that fall to the ground are dried for 48–72 hours in a ventilated area and reach approximately 92 percent dry matter content before being sent for processing (Feedipedia).
The main risk for coarse products is the re-increase in humidity during storage and storage pests. Sugar-rich carob is an attractive food source for moths and other storage insects under suitable conditions. Humid, airless and warm storage increases the risk of both mold and infestation.
Points to be considered in the warehouse:
- The product should be kept in a dry, ventilated and clean warehouse (on a pallet) out of direct contact with the ground.
- The moisture of the product entering the warehouse should be measured; rained or moistened batches should be kept separately.
- The first-in, first-out principle should be applied, and the parties waiting for a long time should be checked regularly.
- Pest monitoring program (trap, visual control) should be applied.
- Packaging and ventilation should be planned together so that temperature differences during the day do not cause condensation.
For more information about broken products What is Carob Kibble (Granule)? You can read our article.
Carob Molasses
Molasses is a very microbiologically durable product thanks to its high sugar concentration. However, this does not mean that molasses does not change at all over time. One of the most important chemical indicators monitored in molasses during storage is hydroxymethylfurfural (HMF), which is formed as a result of the breakdown of sugars under the influence of heat.
In a master's study conducted at İnönü University, grape molasses samples were stored at +4 °C, +25 °C and +37 °C for six months; it was determined that storage time and temperature increased the amount of HMF and decreased the pH value. In the same study, no significant change was observed in ash and brix values during storage (Ayaz, 2018). Although these findings were obtained for grape molasses, it is a general chemical principle that temperature accelerates the formation of HMF and should be taken into account for carob molasses as well.
Karakaya et al. (2025), who examined HMF in grape, mulberry, and carob molasses in Turkey, determined the HMF content in the samples in the range of 1.95–108.63 mg/kg and reported that the average HMF concentration was significantly higher in grape molasses. This wide range suggests that production and storage conditions can significantly affect the HMF level in the final product. Rodríguez-Solana et al. (2021), who compiled carob fruit meat products, also draw attention to the importance of alternative processes and conditions to reduce the formation of furanic compounds.
Practical storage tips for molasses:
- Store in a cool, sunless place; hot environments accelerate the formation of HMF.
- Close the lid tightly after each use.
- Enter the jar with a clean, dry spoon; contamination with water or other food can increase the risk of spoilage.
- If there is a recommendation on the packaging for storage after opening, follow it.
For the production and properties of molasses What is Carob Molasses and How is it Made? You can review our article.
Carob Seed and Range
Carob seed is one of the most durable carob products with its hard shell and low moisture content. Nevertheless, the kernel should be kept clean, dry and protected from pests in storage as it is the raw material for gum production. Moisture, mold or foreign matter contamination affect both yield and end product quality in industrial processing.
Carob gum (E 410) is a fine powder obtained by grinding the core endosperm. Its specifications as a food additive in the European Union are defined in Commission Regulation (EU) No 231/2012 (EFSA ANS Panel, 2017). Since the water-binding capacity is what makes the range functional, the same property brings with it the risk of moisture absorption in storage. The range should be stored in its original packaging, in a closed and dry environment; the opened package should be tightly closed again.
- Core: Dry, ventilated, pest-proof warehouse; stacking on pallet
- Gam: Closed packaging with moisture barrier; should be closed after use
- For both: Traceability with batch number and date of entry
For more information about the core What is Carob Seed? You can read our article.
Storage Summary by Products
The table below summarizes the main risks and storage priorities of carob products. For the exact storage period and conditions, the product label and the supplier's technical document should always be consulted.
| Product | Major risk | Retention priority |
|---|---|---|
| Powder / flour | Moisture absorption, clumping | Air and moisture proof packaging, cool and dry environment |
| Broken / kibble | Insect, moisture, mold | Ventilated dry storage, pest monitoring |
| Whole fruit | Infestation, moisture | Sufficient drying, clean and dry storage |
| Molasses | HMF increase with temperature, aroma change | Cool and dark environment, closed container |
| Core | Moisture, harmful, foreign matter | Dry storage, clean stack |
| Gam | Moisture absorption | Original sealed packaging, dry environment |
| Extract | Varies by form (liquid/powder) | Conditions specified by the manufacturer |
Packaging Selection and Label Reading
Packaging is one of the most effective tools for preserving shelf life. For powder products, multi-layered bags with moisture barriers or inner lined packages are preferred, while for molasses, light-limiting and tight-fitting containers are preferred. For broken and large products such as fruit, a balance must be struck between the moisture permeability of the packaging and the need for ventilation.
It is also important to read the label on the consumer and buyer side. Expiry Date (STT) is a safety date used for products that can deteriorate rapidly from a microbiological point of view. Recommended Consumption Date (TETT) indicates the period during which the product maintains its quality characteristics when stored under appropriate conditions. Dry or high-sugar products such as carob powder, cracks and molasses often have quality-oriented date information. The Ministry's 2023 shelf life guide and brochure explain the difference between these two concepts in detail.
Frequently Asked Questions
Should carob powder be refrigerated? Usually not required. A cool, dry and closed cabinet is sufficient. Since condensation may form when the cold container taken out of the refrigerator encounters ambient air, the moisture problem may increase in containers that do not close tightly.
Does carob molasses go bad? Thanks to its high sugar content, it is microbiologically resistant; however, when kept in a hot environment for a long time, quality losses such as HMF increase and flavor change may occur. Water or other food contamination may cause spoilage.
Can clumped carob powder be used? Clumping is mostly related to moisture absorption. If the smell, color and appearance are normal and there are no signs of insects or mold, the clumps can be crushed and used. In doubtful cases, the product should not be consumed.
What does it mean to see insects on broken carob? It indicates that the product is affected by warehouse pests. This product should not be used for food purposes; the source should be investigated in the warehouse and other batches should be checked.
Correctly Stored Carob Products with Carob Türkiye
The quality of carob products is maintained during the storage and shipment process as well as in production. Keeping humidity under control, protecting it from heat and pests, and choosing the appropriate packaging are the basis for the product to maintain its expected properties throughout its shelf life.
At Carob Türkiye, we supply carob fruit, crumbs, flour/powder, kernels, and extracts. Carob Flour / Powder, Carob Kibble (Granular), Carob Fruit and Carob Seed You can review our pages, for your wholesale and export requests. You can contact us.
Domestic resources
Republic of Turkey Ministry of Agriculture and Forestry, General Directorate of Food and Control, "Guideline on Determining and Indicating Shelf Life Information on Food Labels, Brochure/Poster on Shelf Life", announcement, 21.06.2023. agriculture.
gov. en/ GKGM/ Announcement/ 516/ Food- On their labels- Shelf- … Ayaz, F., "Investigation of quality criteria of molasses obtained from grapes with different compositional properties", Master's thesis, İnönü University, Malatya, 2018. abacus.
Innu. edu. en/ items/ BE314300- 785a- 4977- A123- 1cf621a... Karakaya, H., Bilenler Koç, T., Karabulut, İ., "Bioaccessibility of 5-hydroxymethylfurfural in fruit molasses using an in vitro digestion model and risk assessment based on molasses consumption in Turkiye", Food Additives & Contaminants: Part A, 42(11), 1479–1493, 2025 (study conducted in Turkey). doi.
org/ 10. 1080/ 19440049. 2025. 2565693 Gunel, Z., Tontul, İ., Dincer, C., Topuz, A., Şahin-Nadeem, H., "Influence of microwave, the combined microwave/hot air and only hot air roasting on the formation of heat-induced contaminants of carob powders", Food Additives & Contaminants: Part A, 35(12), 2332–2339, 2018 (study conducted in Turkey). doi.
org/ 10. 1080/ 19440049. 2018. 1544720 Foreign sources
Červenka, L., Frühbauerová, M., Palarčík, J., Muriqi, S., Velichová, H., "The Effect of Vibratory Grinding Time on Moisture Sorption, Particle Size Distribution, and Phenolic Bioaccessibility of Carob Powder", Molecules, 27(22), 7689, 2022. doi.
org/ 10. 3390/ molecules27227689 Červenka, L., Stępień, A., Frühbauerová, M., Velichová, H., Witczak, M., "Thermodynamic properties and glass transition temperature of roasted and unroasted carob (Ceratonia siliqua L.) powder", Food Chemistry, 300, 125208, 2019. doi.
org/ 10. 1016/ j. foodchem. 2019. 125208 Rodríguez-Solana, R., Romano, A., Moreno-Rojas, J. M., "Carob Pulp: A Nutritional and Functional By-Product Worldwide Spread in the Formulation of Different Food Products and Beverages. A Review", Processes, 9(7), 1146, 2021. doi.
org/ 10. 3390/ pr9071146 EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), Mortensen, A. et al., "Re-evaluation of locust bean gum (E 410) as a food additive", EFSA Journal, 15(1), e04646, 2017. doi.
org/ 10. 2903/ j. efsa. 2017. 4646 Feedipedia – Animal Feed Resources Information System, "Carob (Ceratonia siliqua)". feedipedia.
Scientific Resourcesorg/ node/ 320
