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1.
杨晨孔凡田华雷芬芬何东平郑竟成 《中国油脂》2020,45(5):123-127
葵花籽粕是葵花籽提油后的副产品。葵花籽粕蛋白品质优,各氨基酸组成平衡,此外葵花籽粕中还含有绿原酸、黄酮等多种活性物质,营养价值高,具有广阔的应用前景。从葵花籽粕作为原料提取有效成分及作为饲料用原料两方面对葵花籽粕资源的综合利用情况进行了阐述,以期为葵花籽粕的进一步开发利用提供参考。 相似文献
2.
Kun Yang Huiling Wang Jin Huang Di Wu Manman Zhao Jing Ma Weiqing Sun 《International Journal of Food Science & Technology》2021,56(2):733-741
This study investigated the effects of direct current magnetic field (DC-MF) treatment time (1, 3, 5, 8 h) on properties of porcine myofibrillar protein (MP). Gel water-holding capacity increased from 83.40% to 87.20% when DC-MF-treatment time changed from 1-h to 8-h. The 3-h treatment time of DC-MF was found to promote MP unfolding, rearrangement and aggregation, leading to the loss of total sulfhydryl, the increase of reactive sulfhydryl, surface hydrophobicity, turbidity as well as the formation of MP clusters and the greater degree of crosslinking as compared with 0-h treatment, thus a firmer and more ordered MP gel network for trapping more water. However, excessive DC-MF treatment (8-h) weakened DC-MF effect on MP aggregation as well as gel network and texture. This study has shed light on the effects of DC-MF treatment time on MP properties and provides useful information for the application of DC-MF in the food industry. 相似文献
3.
The aim of this study is to investigate the synergistic effects of modified TiO2/multifunctionalized graphene oxide nanosheets at different ratios on the interface compatibility between starch and poly(lactic acid) (PLA). To this end, silanylated nano-TiO2 (MTiO2, 1 and 2%) and alkylated maleic anhydride grafted graphene oxide (f-GO, 0.1, 0.2, and 0.4%) at different combinations are blended with the PLA-starch composites using solution blending technique. Then, the synergistic effects of MTiO2 and f-GO on PLA/starch matrix are investigated in terms of the morphology, crystallinity, structural characterization, thermal stability, dynamic mechanical, and antiaging properties, and the related mechanisms. The Raman and Fourier transform infrared spectroscopy spectra verify the successful synthesis of the two modified nanofillers (f-GO and MTiO2) and the formation of strong hydrogen bond within the PLA-starch nanocomposites. Due to the strong interfacial interaction and the synergistic effect from the combination of 1% MTiO2 and 0.2% f-GO, obvious improvement was observed in PLA-starch versus other nanocomposites in terms of morphology, thermal stability, surface hydrophobicity, storage modulus, ultraviolet-shielding capacity, and aging-resistance. Furthermore, differential scanning calorimeter (DSC), isothermal crystallization kinetic, and X-ray diffraction analysis demonstrate that f-GO and the M-TiO2 significantly synergize in enhancing the crystallization rate and crystallinity of PLA/starch matrix. These results provide novel insights for constructing high-performance nanocomposites and facilitate their applications in food packaging. 相似文献
4.
3-氯-1,2-丙二醇(3-MCPD)经高碘酸钠溶液氧化裂解、腺嘌呤衍生化后的产物——1,N6-亚乙烯基腺嘌呤(ε-Ade)为强荧光物质,通过对其荧光光谱与重要影响因素进行研究与优化,结合测定体系背景干扰的抑制,对高效液相色谱-荧光法(HPLC-FLD)测定3-MCPD水溶液的条件进行了优化。得到优化条件为:使用耐碱性反相C18色谱柱进行测定,流动相中甲醇体积分数为20%,水相为pH 9.0的碳酸钠-碳酸氢钠缓冲液。食用油中3-MCPD的测定需以0.01 g/mL的NaCl溶液作为萃取水相,氧化裂解3-MCPD的高碘酸钠可采用等量的亚硫酸钠还原、1.1倍量的醋酸铅沉淀予以去除,从而抑制空白峰的干扰,将该方法应用于多种食用植物油样品的测定,结果表明:该方法准确度高、重现性好(RSD在0.32%~4.63%之间);样品谱图显示基质干扰很小,方法选择性高。 相似文献
5.
Heng Yang Yang Fu Yudong Zhang Jian Zhou Danfeng Wang Zhen Gao Yuan Ke Qingyun Lv Beibei Ding Xuedong Wang 《International Journal of Food Science & Technology》2021,56(8):4119-4128
Effects of polyols (mannitol and xylitol) on physical properties, pasting properties and dynamic rheological properties of wheat flour and the microstructure, water activity (Aw), radial expansion ratio (ER), oil absorption rate (OAR) and texture of extruded flour products were evaluated in this work. The results show that both mannitol and xylitol can promote gluten network formation, enhance tensile resistance and increase the storage modulus (G') and loss modulus (G'') of the dough. More dense and uniform particles were also found on the surface of extruded flour products in the presence of polyols by scanning electron microscopy (SEM). Furthermore, the Aw, hardness and chewiness were reduced while the ER and ORA were increased for extruded flour products by incorporation of polyols. Thus, the extruded flour products with improved quality by polyols exhibit great application prospect in food industry. 相似文献
6.
Medium‐molecular‐weight chitosan (MMWC; 157.5 kDa) and low‐molecular‐weight chitosan (LMWC; 53.4 kDa) samples were dissolved in an NaOH/urea solution by freeze–thaw treatment. The factors affecting dissolution were optimized, and the stability of chitosan in the produced solution was investigated. NaOH and urea concentrations of 2 and 0.67 mol/L, respectively, and a treatment temperature of ?18°C were optimized as the dissolving conditions. MMWC and LMWC could be completely dissolved in the 2 mol/L NaOH/0.67 mol/L urea solution after six and five cycles of freeze–thaw treatments, respectively. Dissolution and storage in the 2 mol/L NaOH/0.67 mol/L urea solution slightly increased the deacetylation degree of chitosan and slightly decreased the molecular weight. The solution stability of LMWC was better than that of MMWC. MMWC tended to form a gel during storage. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39819. 相似文献
7.
研究sn-1,3-棕榈酸甘二酯对纯净菜籽油氧化稳定性的影响,以期探明其作用机理,为油脂加工和储存提供科学的依据。通过柱层析的方法制备仅含甘三酯成分的纯净菜籽油,测定DAG在菜籽油中形成反相胶束的临界浓度,并在反相胶束体系中,研究DAG及与天然抗氧化剂γ-生育酚及合成抗氧化剂(TBHQ、BHA、BHT)联合作用对纯净菜籽油氧化稳定性的影响。结果表明:DAG在菜籽油中的临界胶束浓度为0.5%;在反相胶束体系中,DAG的添加促进了纯净菜籽油的氧化,DAG对不同种类的抗氧化剂活性的影响存在差异,DAG增强了弱极性抗氧化剂γ-生育酚、BHT的活性,但是减弱了极性较强的抗氧化剂TBHQ、BHA的活性。 相似文献
8.
In this study, the potential of organic acids (formic acid, acetic acid) in a catalytical and mechanocatalytic conversion of lignocellulosic barley straw to valuable sugars is explored using sulfuric acid as a reference. Acid-catalyzed hydrolysis has been carried out with acid-impregnated samples as well as unmodified barley straw. In the mechanocatalytical approach, pretreatment consists of impregnation with the acid catalyst and mechanical treatment by ball milling following chemical hydrolysis. Straw samples and residues were analyzed by Fourier transform infrared spectrometry (FT-IR) whereas hydrolysate analysis was based on total reducing sugar (TRS) determination following the DNS method and capillary electrophoresis (CE) analysis. The results indicated that acetic acid and formic acid are rather mild acids yielding low TRS levels compared to the reference acid. Mechanocatalytical pretreatment slightly increased TRS yields, but not significantly. Strikingly, sulfuric acid showed an efficient conversion efficiency yielding almost 45% of TRS. Furthermore, this study provided evidence for the acetylation of straw components when acetic acid was used as catalyst. Alkali hydrolysis induced the de-esterification, but revealed no significant increase of TRS yields. 相似文献
9.
Porous zinc ferrite (ZnFe2O4) nanorods have been synthesized by the thermal decomposition of ZnFe2(C2O4)3 nanorods precursor, which was prepared by template-, surfactant-free solvothermal method. The morphology and structure of the obtained ZnFe2(C2O4)3 nanorods precursor and porous ZnFe2O4 nanorods were characterized by X-ray powder diffraction, transmission electron microscopy, field emission scanning electron microscopy and high-resolution transmission electron microscopy. The results indicated that the as-synthesized ZnFe2O4 retained the precursor morphology of 1D nanorods with diameters of 100–200 nm and lengths of several micrometers and plenty of nanoparticles were interconnected to each other to form porous nanorods. The as-prepared ZnFe2O4 nanorods as a kind of subsequently light-driven photocatalyst exhibited good photocatalytic decomposition activity for methylene blue (MB). 相似文献
10.
Francesco Venditti Francesca Cuomo Andrea Ceglie Luigi Ambrosone Francesco Lopez 《Journal of hazardous materials》2010,173(1-3):552-557
The feasibility of utilizing CTAB–silica gelatin composite (C-SGC) to remove hexavalent chromium from aqueous solutions under different conditions was investigated. Removal of chromate was assessed through evaluation of the adsorption kinetics of chromate ions on the composite under equilibrium conditions in the presence of sulfate ions and at a slightly acidic pH condition (pH 5.8). Adsorption competition tests in the presence of sulfate ions showed that Cr(VI) was still effectively adsorbed from aqueous solution regardless of the presence of the competing anions. In fact, the adsorption kinetics performed at different initial chromate concentrations were unaffected by the presence of 100 mg L?1 sulfate ions (pH 7.5). The equilibrium adsorption data were fitted by Freundlich adsorption isotherms which confirmed that the adsorption efficiency of chromium on the CTAB–silica gelatin composite was unchanged in the presence of sulfate ions. Further, the adsorption process was shown to be pH dependent and more efficient at slightly acidic pH (5.8). These findings demonstrated a high specificity of the CTAB–silica gelatin composite for chromium, and highlight the possibility of using this matrix for efficient removal of chromium from industrial wastewater without the need to eliminate contaminant sulfate ions. 相似文献