Effect of alcohols on lactose solubility

Area of Science:

• Biochemistry
• Chemical Engineering
• Crystallization Science

Background:

• Lactose, a disaccharide, is a key component in dairy products and has various industrial applications.
• Understanding lactose solubility and crystallization behavior is crucial for optimizing its recovery and purification processes.

Purpose of the Study:

• To investigate the impact of varying alcohol concentrations and chain lengths on lactose solubility and crystallization.
• To analyze the effects of ethanol concentration, time, water content, and agitation on lactose precipitate composition and crystal morphology.

Main Methods:

• Controlled experiments varying alcohol (ethanol) concentrations (2-90% v/v) and chain lengths.
• Analysis of lactose precipitate composition (alpha-lactose, beta-lactose, alpha-hydrate) over time.
• Microscopic observation of crystal morphology and color changes.

Main Results:

• Lactose solubility decreased with increasing alcohol concentration and alcohol chain length.
• Ethanol concentration significantly influenced precipitate composition, with alpha-hydrate forming at low concentrations and anhydrous alpha-lactose at higher concentrations.
• Crystal shape evolved from prisms to tomahawk-like structures, and color intensified with crystallization time and decreasing ethanol percentage.

Conclusions:

• Alcohol concentration and chain length are critical parameters controlling lactose crystallization and precipitate characteristics.
• Optimizing alcohol type and process parameters allows for the recovery of larger quantities and desired forms of lactose.
• This research provides insights for industrial lactose processing and purification techniques.