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Optimizing the precision blending of supplements

Nutraceutical ingredients can be formulated into a wide variety of health-related products, including vitamins, supplements, mineral blends and foods like energy bars. Many of these formulations involve the fine blending of as many as 40 to 50 components, including powders and trace elements.

While nutraceuticals are not regulated like pharmaceuticals, the products still must substantiate label claims, and a number are tested in clinical studies like medicines.

Whenever a nutraceutical makes a label claim, like a specific recommended dietary allowance (RDA) or FDA allowances, vitamin percentages or active components, it must meet those criteria. Further, nutraceutical products must not only avoid doing harm, but also increasingly substantiate any claims or benefits.

One industry challenge is that the blending of solid ingredients is easier and more uniform if the ingredients are approximately the same size. However, it is difficult to create precise blends with trace ingredients (less than 1%) that are dissimilar in size and density. In some cases, this might require multiple key blends in a time-consuming and costly process.

Fortunately, with tumble blending equipment that is engineered to meet the requirements of the application, the process can be simplified to produce a precise, homogenous blend containing necessary components and trace elements in the specified amounts. Such blending can eliminate the need for key blends and produce a better distribution of active ingredients.

Limitations of Traditional Mixing Equipment

Traditional equipment such as plow, ribbon and paddle mixers, which use blades or paddles to push material, are limited to moving the material within the confines of their active area. The mechanics force the material bed outward, leaving dead spots inside the vessel where material moves more slowly or remains stationary. A stationary port at the bottom of such machines further isolates the material.

Another issue lies in the positioning of the intensifier bars, which should ideally be in the mixing zone, where every particle passes through. Many times, however, traditional mixers position intensifier bars in dead zones, resulting in material not being fluidized properly and active ingredients getting incorporated throughout the batch.

Traditional mixers can also waste expensive additives. Because additives initially contact only a small portion of material in the vessel, they get absorbed into the material bed, so more additives are usually needed to achieve the desired mix concentration, which increases cost.

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