Today’s consumer wants it all. They want products that are close to nature, equating natural to safe and gentle. They also want products that provide a noticeable benefit, providing all of the function that modern science can offer. It is the job of the formulator to find the balance between these and offer a bridge between these worlds.
schülke’s sensiva line of multifunctional additives provides personal care products with just this balance. The latest evolutions of this line, sensiva PA 30 and sensiva PA 40, are as gentle as natural ingredients and as effective as traditional preservatives.
Both new products include Zemea Propanediol from DuPont Tate & Lyle Bio Products. This innovative, skin-friendly, 100% natural glycol alternative is used as a humectant or natural solvent in cosmetics and personal care products. Studies have shown that it can boost the efficacy of preservatives, potentially reducing the amount of preservatives needed in the formulation.
sensiva PA 30 combines natural Zemea Propanediol with two nature-identical fragrance ingredients. It offers a lower odor, more broad-spectrum antimicrobial stabilizer as compared to most natural options. The standardization and consistent supply characteristic of nature-identical materials is particularly important for a preservative system that needs to reliably protect the product and the consumer against microbial contamination.
sensiva PA 40 takes this concept one step further, combining natural Zemea Propanediol with a nature-identical fragrance ingredient and a gentle synthetic also known to be an excellent moisturizer. Unlike most non-traditional preservative blends, this synergistic combination can be used at levels similar to more traditional preservative systems.
Challenge tests performed on a variety of cosmetic formulations show both new sensiva products to be effective antimicrobial stabilizers. In the schülke challenge test method, a mixture of bacteria, yeast and mold is inoculated six times (once a week) into the test material with the goal of keeping the test material germ-free for this period. The A criteria is met when the product shows no signs of contamination at any evaluation point during the test. The B criteria is met when only very low levels of contamination are seen at any evaluation point during the testing. Products meeting the B criteria can have their microbiological stability improved by employing other control factors, such as tamper-resistant packaging.
As seen in Table 1, sensiva PA 30 has been shown to effectively stabilize personal care formulas against microbial contamination at 1-2% w/w. sensiva PA 40 has been shown effective against microbiological contamination at 0.5-1.5% w/w, similar to the levels required by more traditional preservative blends (Table 2). Additionally, they support deodorant activity, as they have been shown to inhibit the growth and multiplication of odor-causing bacteria.
The best of science and nature can coexist in modern personal care products. schülke has designed a bridge between the two, by combining the gentleness of nature with the efficacy of science to produce two new antimicrobial stabilizer blends that are perfect for use in nature-inspired products.