Described herein are preservative systems that can include xylitol esters and/or ethers, caprylyl glycol, ethylhexylglycerin, and 1,3-propanediol. Also disclosed are formulations such as cosmetics, pharmaceuticals, and personal care products that include a preservative system as described herein.
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1. A preservative system comprising a xylitol ester and/or xylitol ether, caprylyl glycol, ethylhexylglycerin, and 1,3-propanediol. 2. The preservative system of claim 1, wherein the system is incorporated into a formulation for administration to a mammal. 3. The preservative system of claim 1, furt
1. A preservative system comprising a xylitol ester and/or xylitol ether, caprylyl glycol, ethylhexylglycerin, and 1,3-propanediol. 2. The preservative system of claim 1, wherein the system is incorporated into a formulation for administration to a mammal. 3. The preservative system of claim 1, further comprising an alkaloid, an amino acid residue, a steroid, a flavanoid, a flavonoid, a curcuminoid, a coumarin, a quinone, a phenolic compound, a polyphenolic compound, a glycoprotein, a carbohydrate, a terpene, a protein or peptide, or any combination thereof. 4. The preservative system of claim 2, further comprising an alkaloid, an amino acid residue, a steroid, a flavanoid, a flavonoid, a curcuminoid, a coumarin, a quinone, a phenolic compound, a polyphenolic compound, a glycoprotein, a carbohydrate, a terpene, a protein or peptide, or any combination thereof. 5. The preservative system of claim 1, further comprising anisic acid, butylene glycol, caprylhydroxamic acid, a chelating agent, dehydroacetic acid, gluconolactone, glycerin, glyceryl caprylate, glyceryl laurate, glyceryl undecylenate, 1,2-hexanediol, lactoferrin, nisin, pentylene glycol, phenylethyl alcohol, phenoxyethanol, polyaminopropyl biguanide, potassium sorbate, propylene glycol, sodium benzoate, sodium dehydroacetate, phenylpropanol, chlorphenesin, or any combination thereof. 6. The preservative system of claim 2, further comprising anisic acid, butylene glycol, caprylhydroxamic acid, a chelating agent, dehydroacetic acid, gluconolactone, glycerin, glyceryl caprylate, glyceryl laurate, glyceryl undecylenate, 1,2-hexanediol, lactoferrin, nisin, pentylene glycol, phenylethyl alcohol, phenoxyethanol, polyaminopropyl biguanide, potassium sorbate, propylene glycol, sodium benzoate, sodium dehydroacetate, phenylpropanol, chlorphenesin, or any combination thereof. 7. The preservative system of claim 2, wherein the system is formulated for parenteral administration. 8. The preservative system of claim 7, wherein the parenteral administration is topical, subcutaneous, or subdermal administration. 9. The preservative system of claim 1, wherein the xylitol ester or xylitol ether conforms to one or more of the structural formulas: where R is H, CH3, CH2CH3, or CH2(CH2)y-CH3, with y being 1 to 15, inclusive, and n being, independently, 1-22, inclusive. 10. The preservative system of claim 2, wherein the xylitol ester or xylitol ether conforms to one or more of the structural formulas: where R is H, CH3, CH2CH3, or CH2(CH2)y-CH3, with y being 1 to 15, inclusive, and n being, independently, 1-22, inclusive. 11. The preservative system of claim 2, wherein the xylitol ester or xylitol ether is present in the final formulation at about 0.1-2.5% (w/w); the caprylyl glycol is present in the final formulation at about 0.25-3.0% (w/w); the ethylhexylglycerine is present in the final formulation at about 0.1-2.0% (w/w); and the 1,3-propanediol is present in the final formulation at about 1.0-10.0% (w/w). 12. The preservative system of claim 11, wherein the xylitol ester or xylitol ether is present in the final formulation at 1.0% (w/w); the caprylyl glycol is present in the final formulation at 0.70% (w/w); the ethylhexylglycerine is present in the final formulation at 0.3% (w/w); and the 1,3-propanediol is present in the final formulation at 3.0% (w/w). 13. The preservative system of claim 1, further comprising an active ingredient. 14. The preservative system of claim 2, further comprising an active ingredient. 15. The preservative system of claim 2, wherein the formulation is an emulsion, gel, liquid, ointment, stick, or serum. 16. The preservative system of claim 2, wherein the formulation is an analgesic, antacid, anti-dandruff product, antihistamine, antiperspirant, antiseptic, antitussive, astringent, bronchodilator, cold sore remedy, counterirritant, demulcent, diaper rash cream, diuretic, expectorant, keratolytic, laxative, moisturizer, mouthwash, muscle relaxant, nasal decongestant, shampoo, skin-lightener, sleep aid, sunscreen, topical dermatological product, or wound cleanser. 17. The preservative system of claim 1 wherein the xylitol ester and/or xylitol ether includes xylityl sesquicaprylate. 18. A method of preserving a formulation from microbial contamination comprising including in the formulation a xylitol ester and/or xylitol ether, caprylyl glycol, ethylhexylglycerin, and 1,3-propanediol. 19. The method of claim 18 wherein the formulation is a cosmetic or personal care formulation. 20. A kit in which a preservative system is prepared and packaged for convenient addition to a formulation suitable for use by a consumer or other end user, wherein the preservative system comprises a xylitol ester and/or xylitol ether, caprylyl glycol, ethylhexylglycerin, and 1,3-propanediol.
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