Edible water bottle

The edible water bottle is a blob-like water container made from algae gel. The biorenewable packaging was created[1] by Skipping Rocks Lab in an attempt to make a more environmentally friendly alternative to single-serving plastic bottles.[2] The container, named "Ooho" by its creators, encloses a small volume of water in a membrane made from algae and calcium chloride. Manufacturing process are covered under a Creative Commons license, making the recipe freely distributed and readily available for anyone to use.[3]

Traditional water containers

About 50 billion single-use plastic water bottles made of polyethylene terephthalate (PET) are produced in the United States each year, and most are discarded.[4] According to the National Association for PET Container Resources, the recycling rate for PET has held steady at 31% since 2013.[5] That equates to more than 4,000,000,000 pounds (1.8×109 kg) of unrecycled PET bottles in landfills, on roadsides and beaches, or in rivers and oceans. The properties that make PET useful as a packaging material (stability and durability) also make it resistant to breaking down after its useful life is over.

Polyesters like PET can be broken down through hydrolytic degradation: the ester linkage is cut by a water molecule. The reaction proceeds differently in acidic or alkaline conditions, but works best at temperatures between 200 - 300 °C. Under environmental conditions the process is undetectably slow.[6]

PET is considered to be essentially non-biodegradable, with plastic bottles estimated to take as long as 450 years to decompose.[7] Because of this, other packaging materials are being sought.

Alternative container

The “Ooho” is a gelatinous, double-membrane sphere made by dropping ice into separate solutions of calcium salt and sodium alginate. The process, called spherification, is a technique patented by Unilever engineer William Peschardt in the 1940s. More recently the method was introduced into modernist cooking by Spanish chef Ferran Adrià. The process creates an edible, biodegradable capsule.

Calcium alginate gel
Sodium alginate (NaAlg)

Alginates are the natural product of brown algae and have been used extensively in wound dressing, drug delivery and tissue engineering, as well as food applications.[8][9][10] Sodium alginate is an unbranched copolymer of 1,4-linked-β-d-mannuronate (M) and α-l-guluronate (G) sugars.

Sodium alginate (NaAlg) coagulates when exposed to calcium chloride (CaCl2) and forms calcium alginate (CaAlg2 ) and sodium chloride (NaCl), according to the following reaction:

2NaAlg + CaCl2 --> CaAlg2 + 2NaCl

Safety and biodegradability

The biocompatibility of alginate gels has been studied extensively and their safety for consumption is well established.[11][12] As natural polysaccharides resistant to breakdown by human digestive enzymes, alginates are classified as dietary fiber. Although undigested if eaten, the Ooho capsule will gradually decompose as the calcium diffuses out of the gel matrix in the reverse of the reaction above.[13]

CaAlg2 + 2NaCl --> 2NaAlg + CaCl2

Because it is a single-strand polymer, alginate can be depolymerized (broken into smaller units) by a variety of chemical reactions. Both acid and alkaline mechanisms can break down the linkages between the mannuronate (M) and guluronate (G) monomers. Free radical oxidation is another way the alginate can be degraded in the environment. Many bacterial species produce an enzyme (alginate lyase) which can break the molecule down into single sugar components, which can act as an energy source for the organism.[14]

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See also

References
  1. Peters, Adele. "This Edible Water Bottle Is How You'll Drink In The Future". Fast Company. Fast Company. Retrieved 25 March 2020.
  2. "Ooho! the edible water bottle". www.skippingrocksla.com. Archived from the original on 2015-12-08. Retrieved 2015-11-28.
  3. García González, Rodrigo. "Ooho". Archived from the original on 2016-03-10.
  4. "Why Tap Water Is Better". National Geographic. 2010-03-13. Archived from the original on 2015-11-09. Retrieved 2015-11-29.
  5. Moore, Rick (2015-10-13). "2014 U.S. PET container recycling rate holds at 31%" (PDF). National Association for PET Container Resources. Archived (PDF) from the original on 2015-11-24. Retrieved 2015-10-25.
  6. Kint*, Darwin (1999). "A review on the potential biodegradability of poly(ethylene terephthalate)". Polymer International. 48 (5): 346–352. doi:10.1002/(SICI)1097-0126(199905)48:5<346::AID-PI156>3.0.CO;2-N.
  7. "Garbage Decomposition Time | Waste Segregation Guide". www.getwaste.info. Archived from the original on 2016-03-04. Retrieved 2015-11-29.
  8. Chiu, Chih-Tung; Lee, Jui-Sheng; Chu, Chi-Shung; Chang, Yi-Pin; Wang, Yng-Jiin (2008-02-12). "Development of two alginate-based wound dressings". Journal of Materials Science: Materials in Medicine. 19 (6): 2503–2513. doi:10.1007/s10856-008-3389-2. ISSN 0957-4530. PMID 18266085.
  9. Tønnesen, Hanne Hjorth; Karlsen, Jan (2002-01-01). "Alginate in Drug Delivery Systems". Drug Development and Industrial Pharmacy. 28 (6): 621–630. doi:10.1081/DDC-120003853. ISSN 0363-9045. PMID 12149954.
  10. Alsberg, E.; Anderson, K. W.; Albeiruti, A.; Franceschi, R. T.; Mooney, D. J. (2001-11-01). "Cell-interactive Alginate Hydrogels for Bone Tissue Engineering". Journal of Dental Research. 80 (11): 2025–2029. doi:10.1177/00220345010800111501. ISSN 0022-0345. PMID 11759015.
  11. Lee, Kuen Yong; Mooney, David J. (2012-01-01). "Alginate: Properties and biomedical applications". Progress in Polymer Science. 37 (1): 106–126. doi:10.1016/j.progpolymsci.2011.06.003. PMC 3223967. PMID 22125349.
  12. "CALCIUM ALGINATE - National Library of Medicine HSDB Database". toxnet.nlm.nih.gov. Archived from the original on 2017-11-15. Retrieved 2015-11-29.
  13. Bouhadir, Kamal H.; Lee, Kuen Yong; Alsberg, Eben; Damm, Kelly L.; Anderson, Kenneth W.; Mooney, David J. (2001-01-01). "Degradation of Partially Oxidized Alginate and Its Potential Application for Tissue Engineering". Biotechnology Progress. 17 (5): 945–950. doi:10.1021/bp010070p. ISSN 1520-6033. PMID 11587588.
  14. Steinbüchel, Alexander (2005). Polysaccharides and Polyamides in the Food Industry. Wiley-Blackwell. p. 222. ISBN 978-3-527-31345-7.
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