What are Emulgents elaborate HLB scale?
Griffin’s method An HLB value of 0 corresponds to a completely lipophilic/hydrophobic molecule, and a value of 20 corresponds to a completely hydrophilic/lipophobic molecule. The HLB value can be used to predict the surfactant properties of a molecule: < 10 : Lipid-soluble (water-insoluble)
Who introduced hydrophilic lipophilic balance scale?
Griffin
The HLB number scale, introduced by Griffin in 1949, was the first-ever successful attempt of a quantitative characterization of the polyoxyethylene nonionic surfactants.
What is required HLB?
The required HLB is the HLB of the surfactant, or mixture of surfactants, which allows the most stable emulsion for a given system (processing conditions, oil phase, etc.) to be obtained.
What is required HLB value?
What is the HLB value of SLS?
In addition, SLS has a very high HLB value of 40 meaning it is water soluble and it prefers to form o/w emulsions.
Why is HLB calculated?
A specific HLB called; necessary hydrophile-lipophilic balance (RHLB) & quot; is required for the oil phase of an oil in water (o/w) type emulsion. HLB values for both emulsions of type o/w and w/o can be empirically determined for many oils and fats.
What is the HLB value of solubilizing agent?
HLB is an index of the solubilizing properties of emulsifiers and indicates the type of emulsion (o/w or w/o) that the emulsifier is best suited for (Table 2). HLB values can be calculated based on the molecular structure of the emulsifier or determined empirically.
How to calculate the HLB value of a molecule?
HLB Value and Calculation HLB; According to Griffin, the amphiphilic molecule is the value obtained by dividing the weight percentage of the hydrophilic part by five. There is a balance between hydrophilic and lipophilic parts of amphiphilic molecules. This is expressed as the hydrophilic-lipophilic balance (HLB).
What should the HLB be for W / O emulsion?
HLB values ranging from 1.8 to 8.6. HLB value for W/O emulsion. blends of high and low HLB surfactants can be used to obtain the required HLB of an oil. = 2.89 g
What is the HLB value for oil in water?
specific HLB called; necessary hydrophile-lipophilic balance (RHLB) & quot; is required for the oil phase of an oil in water (o/w) type emulsion. A different RHLB is required to form an oil-in-water (w/o) type emulsion with the same oil phase. HLB values for both emulsions of type o/w and w/o can be empirically determined for many oils and fats.
How are the HLB values of essential oils determined?
The required HLB values of eucalyptus, lippia and peppermint essential oils were determined using droplet size analysis and turbidimetric method on emulsions prepared with emulsifier blends of varying HLB values.