Goal
Extract valuable chemical compounds (phenolics, proanthocyanidins, tannins, essential oils, dyes) from pine bark for use in pharmaceuticals, cosmetics, food, tanning and other applications.
Problem
Conventional bark extraction methods are often low-yield, polluting, or energy-intensive; the patents aim to improve yield, reduce cost, and lower environmental impact.
Concept Summary
A collection of patented methods that employ various solvent-based, enzymatic, microwave-assisted, ultrasonic, electric-field, and sub-critical fluid techniques to isolate and purify bio-active constituents from pine bark. The processes typically involve pre-treatment (grinding, sieving, resin removal), extraction with polar or non-polar solvents (water, ethanol, ethyl acetate, alkali, natural solvents), and downstream steps such as concentration, counter-current extraction, drying, and packaging.
Principles
- Solvent extraction
- Microwave-assisted extraction
- Ultrasonic cavitation
- Enzymatic hydrolysis
- Electric-field / magnetic-field pre-treatment
- Sub-critical fluid extraction
- Counter-current extraction
Scientific Domains
Materials
- pine bark
- non-polar solvent
- 15 % aqueous ethanol
- water
- ethyl acetate
- ethanol
- acetic acid-sodium acetate buffer
- cellulase
- endoglucanase
- alkali (e.g., NaOH)
- natural solvents (e.g., alcohol)
- resin
- sodium hydroxide
- urea composite solution
Mechanisms of Action
- Dissolution of target compounds in selected solvents
- Cell wall disruption by microwave heating
- Cavitation-enhanced mass transfer
- Enzyme-catalyzed breakdown of polysaccharides
- Electroporation of bark tissue
- Selective solubility in sub-critical fluids
Energy Sources
Applications
- pharmaceuticals
- cosmetics
- food additives
- tanning materials
- dye production
Claimed Performance
High extraction rate, high product yield, low cost, environmentally friendly, reduced pollution, short extraction time.
Limitations
- Quantitative performance data not provided in the article
- Scale-up and industrial validation not documented
