Proporciones diferentes en conservantes

[Azimut]

En esta página proponen unos rangos distintos para los conservantes de las cremas tanto solos como en acción conjunta con otro.
http://www.texasnaturalsupply.com/produ ... uctid=KSOR
Potassium Sorbate
SKU KSOR
INCI: Potassium Sorbate

USP; Food Grade
Water Soluble
Granular
Naturally Sourced


Potassium sorbate is the salt of sorbic acid (natural fatty acid). In water potassium sorbate releases sorbic acid which is the active agent.

Appearance: White, fine granules, Slight sweet odor. Easily soluble in cold water.

It is a very effective preservative active against molds, yeast and aerophile bacteria in a wide pH range of 2-6.5 and for extended periods of time.

Typical concentration 0.15-0.3% (if used alone) or 0.1-0.2% (if used in combination with other preservatives).

It is used to preserve all kinds of cosmetic products like creams, lotions, shampoos, makeup & sunscreen products. Potassium Sorbate is a mild preservative. Its primary use is as a food preservative.
Potassium sorbate is used to inhibit molds, and yeasts in many foods, such as cheese, wine, yogurt, dried meats, and baked goods. It can also be found in the ingredients list of many dried fruit products. In addition, herbal dietary supplement products generally contain potassium sorbate, which acts to prevent mold and microbes and to increase shelf life, and is used in such tiny quantities that there are no known adverse health effects.
It is used in many personal care products to inhibit the development of microorganisms for shelf stability. Some manufacturers are using this preservative as a replacement for parabens.
Potassium sorbate is the potassium salt of sorbic acid. It is made by reacting sorbic acid with potassium hydroxide.
It is effective up to pH 6.5 but effectiveness increases as the pH decreases. The lower the pH value of the product the lower amount of Sorbic Acid or Potassium Sorbate is needed for preservation.
Potassium Sorbate is considered a gentle preservative that is safe and mild because of its long term safety record and non-toxic profile. Potassium sorbate is non-irritating and non-sensitizing. Allergic reactions are rare.
Potassium Sorbate is water soluble and can be used effectively in both lotions and water-based liquid soap and shampoo formulations. Although the minimum inhibatory concentration for many fungi and bacteria is approx. 100 ppm, common usage levels range from 0.5 - 1.0%.
Dissolve K sorbate in your water phase at the beginning, to ensure proper dispersion of the product.
You can request via email a table which has the percentage figured out from 1 oz up to 128 oz (1 gallon).

http://www.texasnaturalsupply.com/produ ... uctid=SOBE

Sodium Benzoate Powder (USP) Food Grade
SKU SOBE
Sodium benzoate has the chemical formula NaC6H5CO2.
Air Milled, Super Fine
It is the sodium salt of benzoic acid and exists in this form when dissolved in water. It can be produced by reacting sodium hydroxide with benzoic acid.
Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is used most prevalently in acidic foods such as salad dressings, carbonated drinks, jams and fruit juices and condiments.
Sodium benzoate is produced by the neutralization of benzoic acid with sodium hydroxide. Benzoic acid is a natural preservative found in cranberries, prunes, plums, cinnamon, ripe cloves and apples. Though benzoic acid is a more effective preservative, sodium benzoate is more commonly used as a food additive because benzoic acid does not dissolve well in water.
PHARMACEUTICAL, TOILETRY, and COSMETICS APPLICATIONS
Sodium benzoate, N.F./F.C.C. is used extensively in pharmaceutical preparations, toiletries, and cosmetics. Sodium benzoate is a well known and widely used preservative for pharmaceutical products such as syrups, flavored vehicles, and multiple dose containers for liquid preparations.
The pH is an important factor and use levels may vary.
In the manufacture of compressed tablets that will give clear solutions, a level of 2 to 4% sodium benzoate powder in the granulation has been described as an efficient lubricant and provides rapid disintegration times. Sodium benzoate has a solubilizing effect of certain drugs, which is useful, for instance, in caffeine preparations or certain anesthetic compositions. Sodium benzoate is also used as a diagnostic acid for liver function.
Sodium benzoate is a safe, economical preservative in certain toilet preparations such as creams, lotions, gum solutions, and toothpaste. The advantages of sodium benzoate in these applications are that it is colorless, odorless, readily soluble, and generally is compatible other ingredients. Sodium benzoate has been generally reported to be used at concentrations below 3%.
The preservative is also most efficient at lower pH values. The inhibitory level of sodium benzoate in emulsions increases with oil content. Sodium benzoate has found antimicrobial applications in mouthwashes, dermatological creams and ointments, and deodorants.
The Food and Drug Administration (FDA) includes Sodium Benzoate and Benzoic Acid on its list of direct food substances affirmed as Generally Recognized As Safe (GRAS) .
The safety of Sodium Benzoate has been assessed by the Cosmetic Ingredient Review (CIR) Expert Panel. The CIR Expert Panel evaluated the scientific data and concluded that Sodium Benzoate is safe for use in cosmetics and personal care products at concentrations up to 5%