传统十种白酒香型骨架成分的亲缘性分析

选取十种白酒香型的典型代表作为样品,用气相色谱法对白酒标样进行图谱分析并确定了色谱分析条件。浓香型、兼香型、凤香型和特型四种白酒之间的相似度高达0．9以上,反映出上述四种香型具有较近的亲缘关系;而董香型和芝麻香型之间相似度也超过0．9,二者之间亲缘性较近;米香型和豉香型之间的相似度为0．9,说明二者之间亲缘关系较近。     

干酪风味的研究

对国内外干酪风味的研究现状和最新成果进行了综述,列举并比较了目前国内外用于干酪风味物质提取、分析和鉴定的先进方法,为干酪风味分析方法的选择和发展提供了参考,使对干酪风味组成的深入了解、模拟并改善干酪风味成为可能。     

Effects of Water Activity on the Lipid Oxidation and Antioxidants of Dried Laver (Porphyra) During Storage in the Dark

Lipid oxidation and antioxidant degradation in dried laver (Porphyra) were determined during storage at water activities (A_w) of 0.11, 0.30, 0.51, 0.75, or 0.89 in the dark at 40 °C for 15 d. Lipid oxidation was evaluated by measuring peroxide value (POV) and conjugated dienoic acid (CDA) contents, and fatty acid composition was analyzed by gas chromatography. Contents of polyphenols, tocopherols, and porphyran were determined by spectrophotometry, HPLC, and gravimetry, respectively. The POV and CDA contents of the dried laver lipids increased during storage as A_w increased from 0.11 to 0.30, 0.51, 0.75, and 0.89, whereas the relative content of eicosapentaenoic acid was decreased; however, the contents of polyphenols, α‐tocopherol, and porphyran in dried laver showed the reverse phenomena. Lipid oxidation and antioxidant degradation in dried laver sharply increased at an A_w of 0.51. Polyphenols, α‐tocopherol, and porphyran contributed to reduction of lipid oxidation in dried laver. The degree of lipid oxidation of dried laver was more dependent on the concentration of α‐tocopherol than that of either polyphenols or porphyran during storage in the dark. The results strongly suggest that the quality of dried laver can be improved by preserving tocopherols as much as possible while decreasing A_w during storage.     

天然风味增强剂的开发及应用研究进展

风味增强剂在人们的饮食中扮演着重要的角色,是人们生活质量的标志.传统的风味增强剂包括谷氨酸及其盐类、鸟苷酸及其盐类、肌苷酸及其盐类、核苷酸及其盐类、甘氨酸及其钠盐、麦芽酚、乙基麦芽酚和L-亮氨酸等.文章按来源把天然风味增强剂分为微生物源、动物源和植物源,并对其在食品工业中的应用进行综述.