Tannins

The Biopolymer Network has developed new biopolymers derived from pine bark for industrial applications. Specific pine bark tannin extracts and modified tannins have been developed as bio-based functional additives and formulated into industrial polymer products (e.g. plastics and coatings). Input and support from industry partners  is assisting in the development of biopolymers for some commercial applications such as speciality coatings. Furthermore, a comprehensive “whole-of-life” cost model has been developed for the pine bark extraction process. This model will provide a useful tool for assessing the commercial viability of various manufacturing and investment scenarios.  

Pine Bark Tannin

     

Biopolymer Network pine bark tannin is a natural polyphenolic aqueous extract obtained from the bark of Pinus radiata. It is ideal for a wide range of applications where phenolic functionality or reactivity is required along with antioxidant, antimicrobial and UV absorbing properties.

Basic indicative properties

 

Physical form

A fine brown powder

Polyphenolic content (catechin equivalents)

> 65 %[1]

Carbohydrate content

< 20 %

Moisture

< 5 %

Molecular weight (weight average)

5000-7000

pH (5 % aqueous solution)

4.7

Bulk density

 

loose

0.2 g/ml

packed

0.4 g/ml

Solubility

 

Water, hot

Complete

Glycol

Complete

Ethanol

Partial

Acetone

Partial

Toluene

Insoluble

Weight loss on heating under nitrogen[2]

 

150 °C

0 %

200 °C

2 %

300 °C

17

 [1] Higher contents and more refined grades are also available

[2] Gaugler and Grigsby (2009), Journal of Wood Chemistry and Technology, 29: p. 305-321

Functionality

 

Antioxidant activity (TEAC)

 

Pine bark tannin

5000-6000

For Comparison

 

Vitamin C[1]

3960

Antimicrobial activity (MIC)

 

Staphylococcus aureus

0.25 % (w/v)

UV/VIS absorption

 

λmax

270 nm

SPF (0.02% solution)

3

Antiprotease activity

 

Pepsin

Yes

Protex 6L

None exhibited

Trypsin

None exhibited

Applications

Pine bark tannin HW may find applications in a range of materials, for example as a:
•Phenolic substitute or co-reactant in adhesives and resins for plywood, particle board, MDF other wood or fibre products.
•UV stabiliser, antioxidant, heat stabiliser or corrosion inhibitor in polymer coating formulations.
•UV stabiliser, heat stabiliser, and antioxidant in polymer films and other plastic, foam or composite products or mouldings.
•Functional additive in personal care/cosmetics applications offering high potency antioxidant, antimicrobial and UV absorbing attributes.
•Precursor, co-reactant and multifunctional additive in a wide range of polymer and polymer foam products.
•Absorbent or complexing agent for selected molecules or elements.

Biopolymer Network Ltd has developed technologies to disperse and compatibilise tannin extracts in a wide range of polymer systems, including polyolefins as well as more polar polymers, to attain desired functional attributes. In addition novel derivatisation and co-reaction chemistries have been developed for many polymer and additive applications.

Availability

Test samples available on request.
Other purity specifications and refined extracts are also available on request – some with greater antioxidant functionalities than indicated above.

Tannin for sale.  Contact details:
Jamie Bridson
Scion
jamie.bridson@scionresearch.com
(07) 343-5685


[1] Gliszczynska-Swiglo (2007), Food Chemistry, 101: p. 1480-1483


 


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