共查询到19条相似文献,搜索用时 78 毫秒
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为探究电子束辐照对鸡胸肉异味产生的影响,对不同剂量辐照鸡胸肉中的挥发性化合物进行检测和分析。用固相微萃取-气相色谱-质谱联用法(solid phase microextraction-gas chromatography-mass spectrometry, SPME-GC-MS)对不同剂量辐照鸡胸肉中的挥发性化合物进行分析,对辐照鸡胸肉进行感官评价实验,结合挥发性化合物含量进行偏最小二乘回归分析(partial least squares regression, PLSR)。检测到了18种香气活力值(odor activity value, OAV)大于1的挥发性化合物,其中2 kGy剂量辐照对鸡胸肉中挥发性化合物影响最明显。确定了对鸡胸肉果香、霉香、油脂、鸡肉味、油漆味有重要贡献的特征化合物。感官评价得分结合挥发性化合物的OAV表明反-2-辛烯醛、1-辛烯-3-醇、壬醛、3-羟基-2-丁酮可能是辐照鸡胸肉产生辐照异味的特征化合物。实验结果为电子束辐照食品中异味的检测及掩盖提供理论依据,推动电子束辐照保鲜技术在其他食品中的应用。 相似文献
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目的探讨热释光法在辐照食品检测中出现假阳性的问题。方法按照标准EN1788-2001《食品与硅酸盐矿物隔绝的食品的辐射检验热致发光法》,采用热释光法对深海鱼加工产品进行辐照食品检测。结果与花椒粉等典型辐照样品不同,深海鱼加工产品虽然检测结果为阳性,但其谱图与典型辐照样品谱图存在一定差异。主要表现为一次发光曲线中,典型辐照样品谱图的发光峰下降舒缓,峰型符合正态分布;而深海鱼加工产品的发光峰下降陡峭,并不符合正态分布。据此,怀疑热释光法对深海鱼加工产品的检测分析结果实为假阳性。结论建议在对深海鱼产品进行辐照检测时,谨慎选用热释光法或采用其他检测方法如气相色谱分析碳氢化合物法进行复验。 相似文献
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张宏 《中国食品卫生杂志》2005,17(4):352-355
为促进食品辐照技术的商业化应用,给我国食品辐照管理部门提供借鉴,综述了食品辐照的目的、经电离辐照加工后食品的变化、食品辐照加工的优势、食品辐照技术的历史回顾。介绍了美国、加拿大、欧盟等世界主要贸易国对辐照食品的管理和应用及其辐照方法的发展前景。辐照方法加工食品是一种安全、卫生、经济的新型技术。食品辐照技术既保护环境,又以很少的能量防止了粮食等食物的损失,还可保证食品的安全卫生。 相似文献
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Consumer awareness and acceptance, and influence of benefit statements and price on acceptance of irradiated foods were investigated in Turkey. Consumer awareness of food irradiation was very low (29%). Majority of consumers (80%) were uncertain about the safety of irradiated foods. Only 11% expressed irradiated foods are safe. Level of positive attitude towards irradiated foods increased substantially (62%) upon hearing a benefit statement of food irradiation. Purchase intent of irradiated foods was highest (44%) when price is same as unirradiated foods, but significant proportion of consumers indicated to pay 5% premium price for irradiated foods. A successful market for irradiated foods can be achieved by educating consumers with the benefit and uses of irradiation process. 相似文献
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Ihab Tewfik 《International Journal of Food Science & Technology》2008,43(1):108-113
2‐Alkylcyclobutanones (cyclobutanones) are accepted as radiolytic markers in lipid‐containing foods (LCF). To date, cyclobutanones have not been detected in non‐irradiated foods. Their identification is the basis of a standardised detection test for irradiated LCF (BS EN 1785, 2003). This paper reports work to develop and refine a new rapid method for the analysis of cyclobutanones in irradiated LCF (e.g. chicken meat and liquid whole egg). Direct solvent extraction (DSE) enables the efficient screening of large numbers of food samples and is not as resource intensive as the BS EN 1785 (2003) method. The new DSE appears to be a promising, rapid, simple and robust method for the analysis of irradiated lipid‐containing foods. 相似文献
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Minimal change in irradiated foods with low dose treatment makes the identification process a difficult task. Two independent physical methods, electron paramagnetic resonance (EPR) spectroscopy and thermoluminescence (TL) detection were employed for detection of irradiation treatment on Basmati rice. EPR investigation of 0.5–2.0 kGy irradiated rice samples showed a short lived, asymmetric, dose dependent spectrum (g = 2.005), characterised by the radicals of irradiated starch. However, this signal disappears with time. The present work explores the possibility to identify irradiated rice by the relaxation characteristics and thermal behaviour of the radicals. This study reports for the first time that the different microwave saturation behaviours of the signal (g = 2.004) in irradiated and non-irradiated rice samples provide an important clue to identify radiation treatment beyond the period when the radiation specific EPR spectral lines have disappeared. TL investigation involving scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX) of the poly-minerals isolated from the rice samples allowed to discriminate clearly between irradiated and non-irradiated samples even after a prolonged period of storage. 相似文献
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Anne V J Crone Mark V Hand John T G Hamilton Narain D Sharma Derek R Boyd Mary H Stevenson 《Journal of the science of food and agriculture》1993,62(4):361-367
The synthesis and characterisation of 2-tetradecylcyclobutanone (TCB) is described. Both 2-dodecykyclobutanone and TCB were shown to be present in liquid whole egg irradiated at doses of 2.5 and 10.0 kGy. These compounds were absent from the unirradiated pasteurised samples. Using gas chromatography and infrared spectroscopy, there was also evidence for the presence in irradiated egg of 2-tetradeccnyl- and 2-tetradecadienylyclobutanone which are formed from oleic and linoleic acids, respectively. Authentic standards for these unsaturated cyclobutanones were not available commercially but the presence of 2-tetra-decenylcyclobutanone was substantiated by hydrogenating the egg extracts so converting this unsaturated cyclobutanone to TCB. Saturated and unsaturated cyclobutanones appear to be specific products of irradiation and are potential markers for detection of irradiated liquid egg and probably other fat-containing foods. 相似文献
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ABSTRACT: A study was carried out to examine rheological properties for the detection of irradiated white pepper by viscosity and maximum viscosity methods. Samples in polyethylene bags were irradiated and measured for apparent viscosity and maximum viscosity. The viscosity of all samples decreased with increasing stirring speeds and irradiation dose. This trend was similar for maximum viscosity. The results suggest that the detection of irradiated white pepper is possible by both the viscometric and maximum viscosity methods. Therefore, maximum viscosity method can be used as a new method to detect the irradiated white pepper. 相似文献
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At dosages used for food irradiation, some of the thymine present in the DNA of irradiated food may be converted to thymine glycol. A fluorometric assay for thymine glycol was investigated as a possible method of detecting irradiated foods based on this effect. Experiments were performed on homogenates of irradiated chicken breast meat and on DNA isolated from irradiated chicken breast meat. In both cases the assay was subject to interference from one of the reagents, o-aminobenzaldehyde, and lacked the necessary sensitivity to detect the thymine glycol produced by radiolysis of the DNA at relevant dosages. 相似文献