Ultrafiltration Membrane System for Proanthocyanidin Concentration
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Solution Overview
Problem
Current methods lack an efficient way to selectively concentrate proanthocyanidin compounds (PACs) from fruit juices, such as cranberry juice, to achieve high dry weight concentrations and enhance bioactivity while removing bitter phenolic compounds, which limits their application in health-benefiting products.
Innovation Solution
An ultrafiltration (UF) membrane system is used to fractionate PAC-containing liquid feedstocks into a PAC-reduced permeate stream and a PAC-enriched retentate stream, allowing for the selective retention of higher molecular weight PACs and passage of lower molecular weight soluble solids, enabling the concentration of PACs to specific dry weight percentages and enhancing bioactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional extraction methods are used to obtain PACs from fruit juices, then the extraction process is simple, but the PAC concentration cannot be selectively increased and bitter phenolic compounds remain
Solution Approach 1:
The patent employs ultrafiltration membranes with specific molecular weight cut-offs (MWCO) as porous materials to selectively retain PACs while allowing smaller molecules to pass through. The membrane pores are sized to permit passage of water, sugars, and small phenolics while retaining larger PAC molecules, achieving selective concentration without complex extraction procedures
Solution Approach 2:
The extraction process is segmented into multiple ultrafiltration stages with different MWCO membranes. First, a high-MWCO membrane retains PACs while allowing small molecules to pass. Then, a low-MWCO membrane further purifies by removing smaller phenolic compounds. This segmentation enables progressive purification and concentration
2Reliability
If PACs are concentrated to high dry weight percentages, then bioactivity is enhanced, but the process becomes more complex and time-consuming
Solution Approach 1:
The ultrafiltration process operates continuously, with feedstock continuously pumped through the membrane system and permeate continuously collected. This continuous operation maintains steady-state conditions, maximizing PAC concentration efficiency and reducing total processing time compared to batch methods
Solution Approach 2:
Clarification and preliminary filtration steps are performed before ultrafiltration to remove suspended solids and particulates. This preliminary action prevents membrane fouling and maintains high flux rates throughout the concentration process, reducing processing time
3Object-generated harmful factors
If lower molecular weight phenolic compounds are removed, then bitterness is reduced, but the separation process becomes more difficult
Solution Approach 1:
The patent changes the separation parameter from molecular weight-based ultrafiltration to charge-based separation using ion-exchange resins or charged membranes. This parameter change enables selective removal of phenolic compounds based on their charge characteristics, effectively separating bitter compounds from neutral PACs
4Manufacturing precision
If multiple processing steps are used to purify PACs, then extract clarity is improved, but productivity decreases
Solution Approach 1:
Multiple purification functions are merged into a single integrated ultrafiltration membrane module. The membrane simultaneously performs concentration, clarification, and partial purification in one step, eliminating the need for separate filtration and centrifugation steps, thereby maintaining high clarity while improving productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for the production of PAC-enriched extracts with enhanced bioactivity and clarity, suitable for use in beverages and dietary supplements, by concentrating PACs to desired levels and removing bitter compounds, thus improving the health benefits of PAC-containing products.
Implementation Method 1
A method is described which uses an Ultrafiltration (UF) membrane system to fractionate a PAC-containing liquid feedstock into a PAC-reduced permeate stream and PAC-enriched retentate stream
Data Source
AI summary
A method for producing a proanthocyanidin extract is described. The method comprises: (a) providing a volume of proanthocyanidin-containing liquid feedstock; (b) passing the proanthocyanidin-containing liquid feedstock to an ultrafiltration feed tank; (c) filtering the material in the ultrafiltration feed tank through an ultrafiltration membrane system to fractionate the material into a proanthocyanidin-reduced permeate stream and a proanthocyanidin-enriched retentate stream; (d) collecting the proanthocyanidin-reduced permeate stream; and (e) passing the proanthocyanidin-enriched retentate stream to the ultrafiltration feed tank until the volume of proanthocyanidin-containing liquid feedstock is exhausted and thereafter collecting the proanthocyanidin-enriched retentate stream.