MULTIFUNCTIONALS


TABLE 1: PRESERVATION EFFICACY TESTING MICRO-ORGANISM POOLS Pool 1


Pseudomonas aeruginosa ATCC 9027 Burkholderia cepacia ATCC 25416


Pool 2 Escherichia coli ATCC 8739 Pluralibacter gergoviae ATCC 33028 Klebsiella pneumoniae ATCC 10031


Pool 3 Pool 4 Pool 5


Straphylococcus aureus ATCC 6538 Candida albicans ATCC 10231


Aspergillus brasiliensis ATCC 16404


determined by >99.9% reduction in all bacterial species and >90% reduction in yeast and mould species within seven days of inoculation, with efficacy sustained throughout the test duration. Propylene glycol caprylate


interacts with microorganism membranes aiding the transition of preservatives with intracellular efficacy (organic acids) inside the microorganism and assisting preservatives that target microbial cell membranes (aromatic alcohols). Propylene glycol caprylate


demonstrates preservative potentiation in cosmetic formulations containing phenoxyethanol, sodium benzoate (benzoic acid), potassium sorbate (sorbic acid), and benzyl alcohol (Table 2).


Multifunctional benefits Raw materials with multifunctional benefits, as well as multifunctional personal care products, have become increasingly important to formulators and consumers alike. Multifunctional ingredients offer formulators more flexibility by providing a single option that solves more than one challenge, often allowing improved efficacy and simplification of INCI list. The current economic


climate and cost of living crisis provides additional challenges for formulators. The use of multifunctional ingredients can


Formulation


help reduce the dependence on more costly raw materials or offer a single solution as a cost saving. The potential to use less raw


materials lends itself nicely to the clean and conscious beauty movements, where consumers expect minimalist or simplified ingredient use with the same or improved performance. Multifunctional benefits


propylene glycol caprylate can bring to personal care formulations include: ■ Skin mildness and proven low irritancy compared to other multifunctional ingredients ■ Increased skin hydration ■ Improved skin feel ■ Maintains skin balance ■ Improved emulsification


Skin mildness Our skin is a unique organ, and it differs from person-to-person given our genetics. This means we can all react differently to the products we put on our skin giving rise to sensitisation and allergies in some individuals. Arxada undertook testing of


propylene glycol caprylate to prove its suitability for all skin types. Propylene glycol caprylate was tested at 1.0% in a 48Hr irritation patch test study on a panel of normal and sensitive skin individuals (N=32), with the following results: no palpable reactions observed; well tolerated, comparable to water control.


TABLE 2: PROPYLENE GLYCOL CAPRYLATE PERFORMANCE OVERVIEW Category


Organic acids Shampoo Hair Care Skin Care


Hair conditioner Hair gel


Skin lotion Deodorants Roll-on deodorant www.personalcaremagazine.com + +++


No data +++


No data +


+++ +++ +++ ++


April 2024 PERSONAL CARE Aromatic alcohols


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