Pronulife Guard 688
PRONULIFE Guard 688 is a single strain probiotic ingredient built on Bifidobacterium bifidum Bf-688, sold as a freeze dried powder concentrate and positioned as a psychobiotic for school age children, addressing focus and emotional regulation through the gut and brain axis. The mechanism described for the strain combines modulation of the intestinal microbial community with an antioxidant contribution.
Bifidobacterium bifidum is a Gram positive, non spore forming, strictly anaerobic rod and an established member of the human intestinal microbiota, particularly in early life. The trade material is a cream to light beige free flowing powder with the faint fermented odour typical of freeze dried bifidobacteria, and its strength is declared as colony forming units per gram rather than as a chemical assay.
Because the organism is a strict anaerobe, oxygen exposure limits shelf life as much as moisture and heat do. The powder is hygroscopic, is dosed under low humidity, and is packed under nitrogen in aluminium foil laminate and stored refrigerated. It disperses in cold water but cannot be carried through pasteurisation, extrusion or spray drying, so it is added after every thermal step in a process.
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- Function
- Probiotic
Specifications
| Item | Specification |
|---|---|
| Appearance | Cream to light beige free flowing powder |
| Odour | Characteristic, faintly fermented |
| Viable Count | Conforms to declared potency, reference grade 100 billion CFU/g |
| Identification | Bifidobacterium bifidum by 16S rRNA sequencing |
| Strain Confirmation | Pulsed field gel electrophoresis against reference pattern |
| Loss on Drying | ≤ 5.0% |
| Water Activity | ≤ 0.20 |
| pH, 10% suspension | 4.0 to 6.5 |
| Lead | ≤ 1.0 mg/kg |
| Arsenic | ≤ 1.0 mg/kg |
| Total Plate Count, non probiotic | ≤ 1,000 CFU/g |
| Yeast and Mould | ≤ 100 CFU/g |
| E. coli | Absent in 1 g |
| Salmonella | Absent in 25 g |
| Storage | ≤ 4°C, sealed under nitrogen |
Common Markets Grades
The ingredient is traded as a standardised freeze dried powder declared at a fixed viable count per gram at time of manufacture, with a deliberate overage so the label claim still holds through the stated shelf life. A concentrate around 100 billion CFU per gram is the reference specification, with lower strengths produced by blending the same biomass with maltodextrin or microcrystalline cellulose rather than by growing a different material.
Physical grades follow the requirements of children's dose forms. Plain powder suits sachets and capsules, an agglomerated grade reduces dusting and segregation on high speed lines, and a microencapsulated grade with a lipid or protein coating is used for chewable tablets and for matrices carrying meaningful water activity. Non-GMO, gluten free, kosher and halal documentation is standard, and dairy free carrier options are specified where the finished product is aimed at children with milk allergy.
Applications
- Children's daily probiotic sachets and stick packs, the dominant format because the foil barrier protects viability without needing a cold chain in trade
- Chewable and pressed tablets for children, using a microencapsulated grade to survive compression and saliva contact
- Paediatric drops suspended in a refined oil, a water free carrier that keeps the cells dormant
- Study and focus supplements aimed at school age children, often blended with vitamins or omega-3 powders
- Powdered children's growth and nutrition drinks, dosed into the dry blend after any drying step
- Fermented dairy and drinking yoghurt for children, added after heat treatment as an adjunct to the starter
- Synbiotic combinations with galacto-oligosaccharides or fructo-oligosaccharides, which bifidobacteria ferment preferentially
- Gummies and soft chews, which require a coated grade to tolerate the water activity of the finished piece
Regulatory Status
In the United States Bifidobacterium bifidum is used in conventional foods on a GRAS basis and is marketed as a dietary ingredient under the dietary supplement framework. Statements relating to focus, mood or emotional balance are structure and function claims subject to supplement labelling rules rather than authorised health claims, and products aimed at children carry the same labelling obligations as adult supplements together with the general requirement that claims be truthful and substantiated.
In the European Union the culture is a food ingredient rather than an additive, so no E number applies. Bifidobacterium bifidum holds qualified presumption of safety status at species level in the European Food Safety Authority framework, while the word probiotic itself remains restricted on labels in most member states because no health claim for these cultures carries EU authorisation. Claims directed at children's development and health form a distinct category under the nutrition and health claims regulation and require authorisation before use. The joint FAO and WHO guidelines on probiotics in food set the accepted international requirements for strain identification, viability declaration and labelling.
Manufacturing Process
The strain is grown by submerged anaerobic batch fermentation. A working seed vial is expanded through flask and seed fermenter stages into a production vessel charged with a fermentable carbohydrate, a nitrogen source such as yeast extract or a dairy free peptone, mineral salts and a reducing agent to hold the redox potential low enough for a strict anaerobe. The headspace is blanketed with nitrogen or carbon dioxide throughout, and pH is held near neutral by automatic alkali dosing, since the acetate and lactate produced by the bifid shunt would otherwise stop growth well before the target cell density is reached.
At harvest the broth is concentrated by continuous centrifugation or membrane filtration to a thick cell cream. Cryoprotectants, typically sucrose, trehalose and a protein or hydrocolloid, are blended in to stabilise the membranes through freezing, and the cream is pelletised in liquid nitrogen or frozen on trays and freeze dried until residual moisture falls to the low single figures. The dried cake is milled, assayed for viable count and confirmed for strain identity, blended with carrier to the declared potency and packed under nitrogen.
