Notice of RetractionEffect of Tric Acid on Secondary Metabolism of Monascus

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

In this work, the optimum culture for Monacolin K generaion by Monascus was investigated using rice, sweet potato, potato and dioscorea as the substrates, respectively, and the effect of citric acid on the secondary metabolism of Monascus was also evaluated. Results showed that the production of Monacolin K reached to 4.209 mg/g with dioscorea as the substrate, which was 45.6% higher than that using rice as the substrate. Furthermore, the production of Monacolin K could elevate to 5.26 mg/g by adding 1% citric acid to dioscorea substrate, which was 28% higher than that without citric acid supplementation, while the generation of citrinin declined by 62% with a content of to 3.56 μg/g. According to adjusting pH by lactic acid to the same level as that by adding 1% citric acid, lower production of Monacolin K was obtained with a concent of 4.098 mg/g, that is, a decreasement of 23.3%, indicating that citric acid could affect the secondary metabolite throught regulating the metabolism of Monascus.