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Characteristics and Antitumor Activity of Morchella Esculenta Polysaccharide Extracted by Pulsed Electric Field

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Characteristics and Antitumor Activity of Morchella Esculenta Polysaccharide Extracted by Pulsed Electric Field International Journal of Molecular Sciences Article Characteristics and Antitumor Activity of Morchella esculenta Polysaccharide Extracted by Pulsed Electric Field Chao Liu 1,2, Yonghai Sun 1,*, Qian Mao 1, Xiaolei Guo 1, Peng Li 2, Yang Liu 1 and Na Xu 1 1 College of Food Science and Engineering, Jilin University, Changchun 130000, China; [email protected] (C.L.); [email protected] (Q.M.); [email protected] (X.G.); [email protected] (Y.L.); [email protected] (N.X.) 2 School of Food Engineering, Jilin Agriculture Science and Technology College, Jilin 130000, China; [email protected] * Correspondence: [email protected]; Tel.: +86-431-8509-4968 Academic Editor: Li Lin Received: 19 April 2016; Accepted: 15 June 2016; Published: 22 June 2016 Abstract: Polysaccharides from Morchella esculenta have been proven to be functional and helpful for humans. The purpose of this study was to investigate the chemical structure and anti-proliferating and antitumor activities of a Morchella esculenta polysaccharide (MEP) extracted by pulsed electric field (PEF) in submerged fermentation. The endo-polysaccharide was separated and purified by column chromatography and Gel permeation chromatography, and analyzed by gas chromatography. The MEP with an average molecular weight of 81,835 Da consisted of xylose, glucose, mannose, rhamnose and galactose at the ratio of 5.4:5.0:6.5:7.8:72.3. Structure of MEP was further analyzed by Fourier-transform infrared spectroscopy and 1H and 13C liquid-state nuclear magnetic resonance spectroscopy. Apoptosis tests proved that MEP could inhibit the proliferation and growth of human colon cancer HT-29 cells in a time- and dose-dependent manner within 48 h. This study provides more information on chemical structure of anti-proliferating polysaccharides isolated from Morchella esculenta. Keywords: polysaccharide; Morchella esculenta; chemical structure; anti-proliferating activity; pulsed electric field 1. Introduction Wild and artificial mushrooms are valued by humans as an edible and medical resource, as they are rich in essential bio-macromoleules, such as polysaccharides, proteins and polynucleotides. In recent years, some bioactive polysaccharides isolated from medicinal mushrooms have attracted much attention from the fields of biochemistry and pharmacology. Some mushroom extracts have promising therapeutic effects on cardiovascular diseases, cancers, diabetes [1], and colon cancer, which is one of the causes of cancer mortality [2]. A variety of medicinal mushrooms (e.g., Morchella esculenta (L.) Pers. (M. esculenta)), which are traditionally utilized both as dietary supplements and for cancer treatment, have become increasingly popular [3]. M. esculenta is cherished for both nutritional and medicinal values because of the possession of many bioactive substances, including polysaccharides, proteins, trace elements, dietary fibers and vitamins [4]. M. esculenta has been proven to have anti-inflammatory and antitumor activities [5,6], which were attributed to the possession of polysaccharides [7]. Since M. esculenta is a rare wild resource and its cultivation via traditional methods is very impractical, submerged fermentation was Int. J. Mol. Sci. 2016, 17, 986; doi:10.3390/ijms17060986 www.mdpi.com/journal/ijms Int. J. Mol. Sci. 2016, 17, 986 2 of 16 introduced as an alternative. Some polysaccharides extracted from M. esculenta mycelia are potentially tumor-resistant [8]. Because of water-solution, most functional polysaccharides could be isolated through water extraction assisted with physical methods. However, some physical methods such as radiation means (e.g., heating, microwave and power ultrasound) would cause serious degradation of polysaccharides, reflected especially in their molecular weights (MW). Many functional properties of polysaccharides depend on the molecular mass [9]. Thus, in this study, we selected pulsed electric field (PEF) treatment, which is outstanding for having a significantly higher extraction yield and shorter extraction period [10]. In addition, PEF is a non-thermal technology [11] for the extraction of active ingredients from natural biomaterials unlike the conventional extraction method. PEF extraction can be performed at room temperature without any heating process, except for temperature rise resulting naturally, ´1 even at moderate electric field intensity of 30 kV¨ cm [12]. However, the MW of polysaccharides rapidly decreased by nearly 50% after ultrasonic treatment [9,13], and even more after microwave extraction [14]. There is little literature regarding the extraction of anti-proliferating and antitumor polysaccharides from M. esculenta, and a common problem mentioned in the existing articles is thermal degradation. In order to identify anti-proliferating polysaccharides for tumor treatment, we used PEF to isolate M. esculenta polysaccharides (MEP). Some MEP fractions were purified and elementarily characterized in order to find out if any fraction(s) have potential cytotoxic effect on colon cancer cells. The aim of this study was therefore to validate whether PEF treatment could extract endo-polysaccharide(s) from M. esculenta with little thermal degradation. 2. Results 2.1. Optimization of Pulsed Electric Field (PEF) Extraction According to the experimental conditions and corresponding response shown in Table1, the models for PEF extraction were determined from the following quadratic prediction function. MEP Yield “ 53.28 ´ 3.23 ˆ X1 ` 3.46 ˆ X2 ´ 3.23 ˆ X3 ´ 2.75X1X2 ` 2.74 ˆ X1X3 2 2 2 ´ 1.26 ˆ X2X3 ´ 6.29 ˆ X1 ´ 6.65 ˆ X2 ´ 6.66 ˆ X3 (1) Table 1. Experimental design of code levels and factors in respond surface methodology (RSM) by Box–Behnken design (BBD) matrix. MEP: Morchella esculenta polysaccharide. ´1 Run Order X1 X2 X3 MEP (µg¨ mL ) 1 ´1 1 0 50.21 2 0 1 1 38.15 3 0 0 0 55.62 4 1 1 0 39.15 5 0 ´1 ´1 39.27 6 ´1 0 ´1 50.07 7 1 ´1 0 35.98 8 0 0 0 53.08 9 1 0 ´1 37.23 10 0 1 ´1 46.96 11 0 0 0 54.92 12 0 ´1 1 35.51 13 ´1 0 1 37.95 14 0 0 0 52.66 15 1 0 1 36.07 16 0 0 0 50.13 17 ´1 ´1 0 36.04 Int. J. Mol. Sci. 2016, 17, 986 3 of 16 The results of the model in the form of analysis of variance (ANOVA) were given in Table2. According to the F-value (27.81) and p-value (0.0001), the second-order model was significant between dependent variables and MEP yield (p < 0.05). ANOVA showed a good model performance with the correlation coefficient (R2) of 0.9725. The lack of fit in the model was not significant (p = 0.6673), which also indicated the accurate prediction of the model. As shown in Table3, the reaction factors of X 1 electric field intensity (p = 0.0022), X2 pulse number (p = 0.0015), X3 material-to-liquid ratio (p = 0.0022), X1X2 (p = 0.0252) and X1X3 (p = 0.0256) were all significant in this model. The predicted optimum ´1 PEF extraction condition calculated from the regression equation is as follows: X1 = 17.90 kV¨ cm , ´1 X2 = 6.76, and X3 = 1:26.35 g¨ mL . Under this condition, the predicted MEP yield was maximized to ´1 ´1 ´1 55.21 µg¨ mL . In practice, the operated condition is X1 = 18 kV¨ cm ,X2 = 7 and X3 = 1:27 g¨ mL , with the MEP yield of 56.03 µg¨ mL´1, which was consistent with the prediction (55.21 µg¨ mL´1). Table 2. Results of analysis of variance (ANOVA). Sum of Mean p-Value Source df F Value Significance Squares Square Probability > F Model 932.2642 9 103.5849 27.53076 0.0001 significant X1 83.4632 1 83.4632 22.18282 0.0022 ** X2 95.70361 1 95.70361 25.43607 0.0015 ** X3 83.52781 1 83.52781 22.19999 0.0022 ** X1X2 30.25 1 30.25 8.039835 0.0252 * X1X3 30.0304 1 30.0304 7.98147 0.0256 * X2X3 6.375625 1 6.375625 1.694512 0.2342 2 X1 166.5724 1 166.5724 44.27157 0.0003 ** 2 X2 186.046 1 186.046 49.44725 0.0002 ** 2 X3 186.8866 1 186.8866 49.67067 0.0002 ** Residual 26.33761 7 3.762515 Lack of Fit 7.825525 3 2.608508 0.563634 0.6673 not significant Pure Error 18.51208 4 4.62802 Cor Total 958.6018 16 df: degree of freedom; * : p < 0.05; **: p < 0.01. Table 3. Yields and relevant molecular parameters of four peaks of F2 in gel permeation chromatography (GPC) analysis. Parameters Fractions Retention Yield Mn (Da) M (Da) Mz (Da) Mv (Da) M /Mn Mv/Mn Mz/M Time (min) (%) W W W M1 13.054 25.575 198,950 222,344 256,908 222,344 1.11758 1.11758 1.15545 M2 14.205 52.119 74,633 81,835 89,127 81,835 1.09651 1.09651 1.08909 M3 20.308 13.929 413 428 443 428 1.03685 1.03685 1.03495 M4 21.286 8.377 183 192 201 192 1.05083 1.05083 1.04301 Mn, MW, Mz, and Mv are present number, weight, z-average, and viscose molecular weight, respectively; MW/Mn means poly dispersity ratio. Figure1 showed the combined effects of X 1,X2 and X3 on MEP yield. The MEP yield was ´1 ´1 maximized to 55.62 µg¨ mL at X1 = 20 kV¨ cm and X2 = 6 while X3 was controlled under ´1 1:30 g¨ mL (Figure1a,b). The quadratic effects of X 1 and X3 on MEP yield are shown in Figure1c,d, in which the MEP yield increased first and then declined. The same quadratic effect of X2 and X3 was found in Figure1e,f. These results clearly reconfirm the maximum MEP yield calculated from the regression equation.
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