Alkaline extraction of seaweed carrageenan hydrocolloids using cocoa pod husk ash
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The cocoa industry in Ghana is the second largest in the world, and it generates huge amounts of cocoa pod husks, which currently represent a disposal problem as no significant use has been found for them. The husks are rich in potassium, which may be used for alkaline hydrocolloid extraction from red seaweeds. Chemical and rheological properties of κ-carrageenan from Kappaphycus alvarezii and the Ghanaian red seaweed Hypnea musciformis extracted by KOH (benchmark) or by a cocoa pod husk ash solution were compared. Similar extraction yields and successful modification of the seaweed hydrocolloids with 3,6-anhydro-galactopyranose and sulfate contents of 37–38 and 16–17%, respectively, were obtained with cocoa pod husk ash and KOH extraction. Gel strengths of the κ-carrageenans were also similar: G′ at 25 °C were 5780 Pa with cocoa pod husk ash and 5930 Pa with KOH. These findings have implications for industrial waste biomass utilization and sustainable green growth development of seaweed hydrocolloid processing in Ghana.
KeywordsPotassium Carrageenan Hypnea Rheology Circular economy
This paper is part of the Seaweed Biorefinery Research Project in Ghana (SeaBioGha) supported by Denmark’s development cooperation (Grant DANIDA-14-01DTU) Ministry of Foreign Affairs of Denmark. We thank the Water Research Institute (WRI), Council for Scientific Research (CSIR), Accra, Ghana for their technical assistance in collecting the seaweed samples and Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana for supplying the cocoa pod husk. We also appreciate the donation of cultivated Kappaphycus alvarezii from NhaTrang Institute of Technology Research and Application, Vietnam. Soheila G. Parto, CHEC Research Centre, Dept. of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads 229, 2800 Kgs. Lyngby Denmark is thanked for assisting with GC-analyses.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 1.Ghana Cocoa Board (2014) 45th Annual report and financial statements for the year ended 30. sept. 14. 2014Google Scholar
- 2.Agyarko K, Asiedu EK (2012) Cocoa pod husk and poultry manure on soil nutrients and cucumber growth. Adv Environ Biol 6:2870–2874Google Scholar
- 3.Oddoye EOK, Rhule SWA, Agyente-Badu K, Anchirinah V, Ansah FO (2010) Fresh cocoa pod husk as an ingredient in the diets of growing pigs. Sci Res Essays 5:1141–1144Google Scholar
- 4.Yapo BM, Besson V, Koubala BB, Koffi KL (2013) Adding value to cacao pod husks as a potential antioxidant-dietary fiber source. Am J Food Nutr 1:38–46Google Scholar
- 6.Bolton JJ, De Clerck O, John DM (2003) Seaweed diversity patterns in Sub-Saharan Africa In: Decker C, Griffiths CL, Prochaka K, Ras C, Whitfield A (Eds). Proc Mar Biodivers Sub-Saharan Africa Known Unkn p 229–241Google Scholar
- 10.Sluiter A, Hames B, Hyman D, Payne C, Ruiz R, Scarlata C, Sluiter J, Templeton D, Wolfe J (2008) Determination of total solids in biomass and total dissolved solids in liquid process samples. NREL Technical Report NREL/TP-510-42621 (Issue date 3/31/2008), www.nrel.gov/biomass/analytical_procedures.html
- 11.Sluiter A, Hames B, Ruiz RO, Scarlata C, Sluiter J, Templeton D (2005) Determination of ash in biomass. NREL Technical Report NREL/TP-510-42622 (Issue date 7/17/2005), www.nrel.gov/biomass/analytical_procedures.html
- 13.Jones B, Vernon WC (1990) Sampling, handling and analysing plant tissue samples. In RL Westerman (Ed) Soil testing and plant analysis 3rd ed SSSA Book Series No 3Google Scholar
- 16.Steffe JF (1996) Rheological methods in food processingGoogle Scholar
- 18.Yaw MI, Asiedu E, Yalley PPK, Senyo DK (2015) Feasibility of using cocoa pod husk ash (CPHA ) as a stabilizer in the production of compressed earth bricks. Intl J Eng Res Gen Sci 3:514–524Google Scholar
- 19.Amoanyi R (2012) The study of alternative chemical stabilization of clays with agricultural waste materials for rural housing. PhD Thesis, Kvame Nkrumah University of Science and Technology, Kumasi, GhanaGoogle Scholar
- 23.van de Velde F, de Ruiter GA (2002) Carrageenan. In: Steinbüchel A, DeBaets S, van Damme EJ (eds) Biopolymers (vol. 6) polysaccharide II polysaccharides from eukaryotes. Wiley-VCH, Weinheim, pp 245–274Google Scholar