| In order to understand the quality characteristics of millet in Qinzhouhuang protection and compare the millet quality characteristics from the protection and the surrounding area,and provide theoretical basis for the protection,scientific consumption,development,utilization and deeper processing research of geographical indication products.The protection areas were divided into core area and non-core area.In this paper,millet in Qinzhouhuang reserve(which was divided into core area and non-core area)and its surrounding areas in Shanxi were used as materials.By comparing their colors,nutrient components,antioxidant capacity and starch physicochemical properties,the origin traceability discrimination analysis of the production areas was carried out,and the results as follows.1.Through the extraction of millet color features by image processing,it was found that the blue average value(B.Mean)in the core area was significantly lower than that in the noncore area and the extra-regional area,which indicated that Qinzhouhuang millet in the core area had the yellowest color and can basically be discriminated from the others producing areas.By analyzing the correlation between the important indexes of color parameters and total carotenoid content,it was found that the total carotenoid content has a very significant positive correlation with red mean,red normalized value(NRI)and green normalized value(NGI),and a very significant negative correlation with blue mean and blue normalized value(NBI),indicating that the variability of millet color parameters was related to the total carotenoid content.The BP artificial neural network model was superior to KNN model and Fisher model in the color-based discriminant model of millet production area,and the correct rate of both training count and testing count reached 96.7%.2.By detecting the nutrient components of millet,it was found that the content of protein and starch in core area was the highest,but the content of dietary fiber was the lowest.The content of protein in non-core area was the highest,while the content of fat and dietary fiber was the lowest in extraterritorial area.By analyzing the correlation gelatinization and texture characteristics of millet,it was found that some gelatinization indexes had significant correlation,and most texture indexes showed significant positive correlation.The Fisher discriminant model based on nutritional components had a correct rate of 96.7% for original and 93.3% for cross validated.3.Through the determination of antioxidant activity,it was found that the contents of both polyphenol and flavonoid were the highest contents in the core area,and the antioxidant activity was linearly related to the concentration.The antioxidant activity of millet polyphenol extracts in the core area increased with the increase of extract concentration,but the antioxidant capacity of millet polyphenol extracts in the core area was better than that in non-core areas and extraterritorial areas.The Fisher discriminant model based on antioxidant characteristics had a correct rate of 96.7% for original and 86.7% for cross validated.4.After studying the physical and chemical characteristics of millet starch,it was found that the amylose content and iodine blue value in the core area were the lowest,the amylopectin content was the highest,and the amylose content and iodine blue value in the non-core area were the highest.There was no obvious difference in the shape and size of millet starch.X-ray diffractometer(XRD)had similar curve trends,with the highest crystallinity in the core production,followed by the extraterritorial production and the non-core production.The curves of millet starch from different production areas determined by Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC)and thermogravimetry(TG)were basically the same.Scatter diagrams showed that the protection areas(core areas and noncore areas)can be clearly distinguished with the extra-territorial areas. |
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