Ahmed I Eibaid1 
,
Ming Miao1,
Bo Jiang1 ,
Mohanad O Bashari2,
Abubakar Musa1,3
For correspondence:- Bo Jiang Email: bjiang@jiangnan.edu.cn Tel:+86-510-85329055
Received: 18 December 2014 Accepted: 16 March 2015 Published: 26 April 2015
Citation: Eibaid AI, Miao M, Jiang B, Bashari MO, Musa A. Improvement of 2-O-^5;-D-glucopyranosyl-L-ascorbic acid biosynthesis using ultrasonic radiation. Trop J Pharm Res 2015; 14(4):599-604 doi: 10.4314/tjpr.v14i4.6
© 2015 The authors.
This is an Open Access article that uses a funding model which does not charge readers or their institutions for access and distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0) and the Budapest Open Access Initiative (http://www.budapestopenaccessinitiative.org/read), which permit unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited..
Purpose: To improve 2-O-α-D-glucopyranosyl-L-ascorbic acid (AA-2G) production using ultrasonic radiation (UR) treatment.
Methods: The production of AA-2G using UR or ultrasonic radiation with shaking (URS) at 150 rpm, at varying power (100 − 500 W), temperature (30 – 65 °C), pH 4.0 −9.0, and time (2−24 h) was compared with that produced in a shaker water bath (SWB) in a reaction catalyzed by cyclodextrin glucanotransferase (CGTase) from Bacillus sp. SK13.002. The effect of URS on CGTase activity was also measured.
Results: Maximum AA-2G production using UR at a power of 400 W, temperature of 37 oC, and pH 8.0 for 18 h was 5.69 ± 0.2 g/L, while URS at 500 W/150 rpm and 37 °C for 14 h yielded 7.05 ± 0.21 g/L of AA-2G. URS at 500 W/150 rpm, 55 °C, and pH 8.0 for 6 h yielded 6.6 ± 0.25 g/L of AA-2G. URS at 37 and 55 °C significantly increased CGTase activity. AA-2G yield using UR (400 W) was decreased by 9.7 % compared to that produced by SWB. However, the AA-2G yield using USS (500 W/150 rpm) at 37 and 55 °C increased by 11.9 and 4.8 %, respectively, with a reduction in process time of 41.7 and 75 %, respectively, compared to that previously produced by SWB.
Conclusion: These results indicate that UR combined with shaking improves AA-2G production.
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