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

Eur Food Res Technol (2015) 240:719–724

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

DOI 10.1007/s00217-014-2376-8

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

Xijun Lian · Lizeng Liu · Shirui Dong · Hong Wu · Jixing Zhao · Yanjun Han

Received: 9 June 2014 / Revised: 1 November 2014 / Accepted: 3 November 2014 / Published online: 11 November 2014 © Springer-Verlag Berlin Heidelberg 2014

Abstract Different monascus red pigments were pro-duced 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 Shan-dong Zhonghui Food Company in China, and their struc-tures were identified by visible light absorbance, Fourier transform infrared, Nuclear magnetic resonance, Electro-spray ionization–mass spectrometry and X-ray diffraction. Their molecular weights were 303.5 and 331.5, respec-tively. Their molecular formulas were C18H25NO3 and C20H29NO3. Their λmax 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

X. Lian (*) · S. Dong (*)

Tianjin Key Laboratory of Food Biotechnology, School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, People’s Republic of Chinae-mail: lianliu2002@http://www.wenkuxiazai.comS. Dong

e-mail: 82112370@http://www.wenkuxiazai.com

L. Liu (*)

School of Science, Tianjin University of Commerce, Tianjin 300134, People’s Republic of Chinae-mail: 2509848660@http://www.wenkuxiazai.com

H. Wu

Institute of Agro-Products Processing Science and Technology, Xinjiang Academy of Agricultural and Reclamation Science, Xinjiang, Shihezi 832000, People’s Republic of ChinaJ. Zhao · Y. Han

Shandong Zhonghui Bio Technology Co., Ltd, Jinan 251705, Shandong, People’s Republic of China

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.

Keywords Monascus red pigments · IR · NMR · ESI-MSAbbreviationsIR Infrared ray spectrum ESI-MS Electrospray ionization–mass spectrometryNMR N uclear magnetic resonance

Introduction

Monascus red pigments are natural colorants widely used in the field of food industry in China. The largest consump-tion of the pigments is for sausage to strengthen the light pink color due to insufficient content of meat. Many com-panies such as Shandong Zhonghui Food Company, Tianyi Biological Engineering Company Limited (Dongguan, Guangdong province, China), Nanping Lvfeng Red Rice Limited Company etc. in China could produce monascus pigments with their own strains. Up to now, there are about 31 kinds of monascus red pigments isolated and identified by different researchers [1–12], but only one kind of them is from China [7]. We have found many kinds of monascus red pigments in commercial productions prepared by dif-ferent manufactures in China by ESI-MS. In this paper, two new monascus red pigments isolated from Shandong Zhon-ghui Food Company are identified by visible absorbance spectrum, IR, NMR and ESI-MS.

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