Issue 4, 2014
From the journal:

Green Chemistry

Hydrolysis of green-tide forming Ulva spp. by microwave irradiation with polyoxometalate clusters

Shuntaro Tsubaki,*a   Kiriyo Oono,a   Masanori Hiraoka,a   Tadaharu Ueda,b   Ayumu Onda,b   Kazumichi Yanagisawab  and  Jun-ichi Azumac  

* Corresponding authors

a Oceanography Section, Science Research Center, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan
E-mail: stsubaki@kochi-u.ac.jp, shuntaro.tsubaki@gmail.com
Fax: +81-88-844-8927
Tel: +81-88-844-8927

b Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan

c Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan

Abstract

Effectiveness of microwave irradiation was demonstrated for hydrolysis of Ulva spp. with addition of polyoxometalate (POM) clusters. Aqueous solution of POMs (2–50 mM) at 140 °C yielded 349–435 mg g−1 of neutral sugars (predominantly constituted of rhamnose) and uronic acids from Ulva spp. under an electromagnetic field. POMs were also capable of producing significantly larger amounts of reducing sugars than hydrochloric and sulfuric acids by 1.67–6.27 times with only very low amount of furfural derivatives (≤0.1%). Phosphotungstic acid (PW) was found to be the most suitable POM for hydrolysis of Ulva spp. Microwave irradiation showed higher production of sugars than external conduction heating using an induction oven by 5–10% (neutral sugars) and 24–33% (uronic acids) at the same thermal history. In addition, PW was recycled at least three times by diethylether extraction without changing its activity.

Graphical abstract: Hydrolysis of green-tide forming Ulva spp. by microwave irradiation with polyoxometalate clusters

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Article information

DOI
https://doi.org/10.1039/C3GC42027B
Article type
Paper
Submitted
29 Sep 2013
Accepted
11 Dec 2013
First published
12 Dec 2013

Green Chem., 2014,16, 2227-2233

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Hydrolysis of green-tide forming Ulva spp. by microwave irradiation with polyoxometalate clusters

S. Tsubaki, K. Oono, M. Hiraoka, T. Ueda, A. Onda, K. Yanagisawa and J. Azuma, Green Chem., 2014, 16, 2227 DOI: 10.1039/C3GC42027B

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