- In the beverage industry, especially in the production of fruit juice and soft drinks, bacterial contamination is a constant challenge for quality control.
- Among them, the species Alicyclobacillus, yeasts and more specifically Zygosaccharomyces bailii or Zygosaccharomyces rouxii have been identified as major problems. Detecting and controlling them early is a challenge and extremely important to protect product quality.
1. The main spoilage microorganisms in beverages
The microorganisms present can originate from the fruit/raw materials themselves, but can also come from other sources such as water, equipment, and the production environment.
* Alicyclobacillus
- One of the most notorious spoilage bacteria in the beverage industry is Alicyclobacillus, especially Alicyclobacillus acidoterrestris. These spore-forming bacteria are heat-resistant and can survive pasteurization processes.
- Even low concentrations of Alicyclobacillus can cause spoilage by producing an off-flavor, often described as a medicinal or smoky odor, caused by guaiacol compounds.
* Yeast contamination
- Yeasts are another significant concern for manufacturers, because they can ferment sugar, leading to product spoilage and packaging damage.
- Yeast spoilage in general is common in products that are not sterilized or not sealed properly, especially after the packaging has been opened. Saccharomyces cerevisiae, two species besides it also stand out as the main troublemakers throughout the production process.
* Zygosaccharomyces bailii
- This yeast species has a high resistance to common beverage preservatives such as benzoic acid and sorbic acid.
- Zygosaccharomyces bailii is known for its gas production, which leads to bulging or bursting packaging, making it a challenge that cannot be ignored.
* Zygosaccharomyces rouxii
- Although less notorious than Z. bailii, Zygosaccharomyces rouxii also poses a threat in environments that are high in sugar and have low water activity, such as fruit juice concentrates.
- It is especially good at surviving osmotic stress, which allows it to persist in products with very high sugar concentrations.
* Dekkera yeasts
- These species can also spoil mild beverages. They grow slowly and can take many weeks to become visible, which makes them hard to detect by conventional testing.
2. Detection and prevention with the Real Time PCR method
- Early and accurate detection of these spoilage organisms is crucial to prevent product recalls.
- Our GEN-IAL real-time PCR detection kits provide a fast, dependable method for detecting Alicyclobacillus and spoilage yeasts such as Zygosaccharomyces bailii, Zygosaccharomyces rouxii or Dekkera spp.
* The benefits of the GEN-IAL® Real Time PCR kits include:
- Easy to use: the lyophilized tubes allow an easy and efficient PCR setup. The kit-specific samples allow direct sample preparation without extra extraction steps.
- Comprehensive coverage: designed specifically for the main spoilage microorganisms in the fruit-juice and beverage industry.
- Practical: universal kits and pre-coated PCR tubes
- Open system: compatible with many different qPCR tube formats
* Learn more about our kits
- GEN-IAL® QuickGEN Alicyclobacillus differentiation
- GEN-IAL® QuickGEN Yeast Zygosaccharomyces bailii low
- GEN-IAL® QuickGEN PCR Kit Zygosaccharomyces rouxii
- GEN-IAL® QuickGEN Yeast Dekkera spp.
In summary, spoilage microorganisms such as bacteria and yeasts represent significant risks for the beverage industry. Early identification and control of these organisms, especially by using GEN-IAL® Real-Time PCR test kits, helps manufacturers protect product quality, minimize losses, and maintain consumer confidence.
Source: food.r-biopharm.com