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Two new monascus red pigments produced by Shandong Zhonghui Food Company in China

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Abstract

Different monascus red pigments were produced by many companies in China with their own strains, but most of them are rarely identified. Two new monascus red pigments of the homologous series were isolated from commercial monascus red pigments produced by Shandong Zhonghui Food Company in China, and their structures were identified by visible light absorbance, Fourier transform infrared, Nuclear magnetic resonance, Electrospray ionization–mass spectrometry and X-ray diffraction. Their molecular weights were 303.5 and 331.5, respectively. Their molecular formulas were C18H25NO3 and C20H29NO3. Their λ max are observed at 426.0, 493.5 nm. They are characterized by the absence of lactone ring, carbonyls and methyl, the presence of hydroxyls and the existence of double bonds at the end of the aliphatic side chains. The characteristic X-ray diffraction pattern of the new monascus red pigments is the strong diffraction peaks at 31.62°, 45.34° and 56.40° 2θ and the weak ones at 27.28°, 66.08° and 75.20° 2θ. The findings in the paper have inferred that many monascus red pigments might be synthesized in the half way of well-known red pigments synthesis. Those two pigments have potential application in beverages.

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Abbreviations

IR:

Infrared ray spectrum

ESI-MS:

Electrospray ionization–mass spectrometry

NMR:

Nuclear magnetic resonance

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Nos. 31271935, 31260396). Authors would like to thank Han Hongkun for her kindly help in the experiments.

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None.

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This article does not contain any studies with human or animal subjects.

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Correspondence to Xijun Lian, Lizeng Liu or Shirui Dong.

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Lian, X., Liu, L., Dong, S. et al. Two new monascus red pigments produced by Shandong Zhonghui Food Company in China. Eur Food Res Technol 240, 719–724 (2015). https://doi.org/10.1007/s00217-014-2376-8

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  • DOI: https://doi.org/10.1007/s00217-014-2376-8

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