共查询到19条相似文献，搜索用时 328 毫秒
1.
汪霄峰 《农产品加工．学刊》2010,(12)
对乳粉中脂肪含量进行不确定度的评定,建立不确定度评定程序和方法。依据GB 5413.3-2010《食品安全国家标准婴幼儿食品和乳品中脂肪的测定》建立数学模型,进行不确定度的计算并合成不确定度。找出了影响乳粉中脂肪含量的主要因素,分析了不确定度分量的主要来源,并对结果予以讨论。评定程序和方法符合规范要求,适用于同类型试验不确定度评定。 相似文献
2.
冯俊 《农产品加工．学刊》2011,(4):86-88,118
对保健食品中原花青素的测定进行不确定度的评定,建立不确定度评定程序和方法。依据《保健食品检验与评价技术规范》建立数学模型,进行不确定度的计算并合成不确定度。找出了影响保健食品中原花青素测定的主要因素,分析归纳了不确定度分量的主要来源。评定程序和方法符合规范要求,适用于同类型试验不确定度评定。 相似文献
3.
采用GB 5009.6—2016《食品中脂肪的测定:第二法酸水解法》测定肉制品中游离态与结合态脂肪含量的不确定度评定方法,依据JJF 1059.1—2012《测量不确定度评定与表示》对脂肪测定中的各分量分析量化,并计算合成不确定度和评定结果的扩展不确定度。通过评定找出了影响肉制品中游离态与结合态脂肪含量测定的主要因素,并对结果进行了讨论,评定程序和方法适用于同类型试验的不确定度评定。 相似文献
4.
采用液相色谱-原子荧光光谱法测定稻米中无机砷的不确定度评定方法。建立数学模型,分析影响其不确定度的因素来源,对各不确定度分量进行评定,并计算合成不确定度,评定结果的扩展不确定度。稻米中无机砷含量的结果 0.114±0.019 mg/kg (k=2,置信水平95%)。拟合标准曲线是该方法不确定度的主要来源,其他分量影响相对很小,可以忽略不计。 相似文献
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6.
对氢化物原子荧光光度法测定食品中汞含量进行不确定度评定,建立起较完善的评定体系,探寻不确定度的主要来源,加以控制,提高检测的质量。评定结果表明:校准曲线的线性回归和测量的重复性是影响该方法的不确定度的主要因素,从而为氢化物原子荧光法测定食品中重金属的不确定度评定提供了相关基础。 相似文献
7.
《农产品加工．学刊》2020,(9)
建立气相色谱-三重四极杆质谱法测定蔬菜中苯醚甲环唑不确定度评定的数学模型,全面分析和评估测定全过程的不确定度来源,并对各个不确定度的分量进行量化、合成,得出其主要的不确定度因素来源于标准溶液的配制、样品的稀释和样品的处理等过程,整体评定方法清晰合理,可用于蔬菜中苯醚甲环唑农药残留的不确定度评定。 相似文献
8.
探讨了分光光度法测定油脂中磷脂含量的不确定度评定方法.根据测量不确定度的评定原理和测定方法,建立数学模型,评估了各不确定度分量并计算合成标准不确定度及扩展不确定度.对磷脂含量为0.334%的油脂样品,其扩展不确定度为0.010%.该方法的不确定度主要来源于由标准曲线查磷量、总重复性测定. 相似文献
9.
采用气相色谱法对稻谷中三环唑残留量的不确定度进行评估。根据JJF 1135—2005化学分析测量不确定度评定和JJF 1059.1—2012测量不确定度评定与表示中的相关规定,对测定过程中可能引入的不确定度进行分析和评估,建立了测定稻谷中三环唑残留量不确定度评定的数学模型,分析不确定度的主要来源,并将各分量进行合成。得出当稻谷中三环唑的量为0.262mg/kg时,其扩展不确定度为0.020 mg/kg (k=2)。 相似文献
10.
对免疫亲和柱净化-高效液相色谱-光化学柱后衍生法测定花生酱中黄曲霉毒素的不确定度进行评定。建立数学模型,对检测中的各种不确定度分量进行评估和计算合成,找出影响测量不确定度的主要因素,给出免疫亲和柱净化-高效液相色谱-光化学柱后衍生法测定花生酱中黄曲霉毒素的合成相对标准不确定度及扩展不确定度。 相似文献
11.
J. D. Lee M. L. Oliva D. A. Sleper & J. G. Shannon 《Journal of Agronomy and Crop Science》2008,194(4):320-324
Soya bean [ Glycine max (L.) Merr.] genotypes with modified unsaturated fatty acid profiles in seed oil have been developed. Higher oleic (18:1) and lower linolenic (18:3) acids are desirable for increased use of soya bean oil in food and industrial applications. The environment affects levels of unsaturated fatty acids in soya bean and it is important that desired components of seed oil are produced across a range of growing conditions. Our objective was to determine whether irrigation affects fatty acid levels in soya bean with altered fatty acid profiles. Seven modified oil genotypes which included elevated oleic acids, and/or reduced linolenic acid, along with two common soya bean varieties were evaluated with and without irrigation (rain fed) in four environments in each of 2 years. Irrigation generally had no significant influence on unsaturated fatty acid accumulation in seed oil in soya bean genotypes with altered fatty acid profiles. However, irrigation tended to show desirable effects on 18:1 and 18:3 contents in the genotypes studied. Oleic acid tended to be higher in eight of the nine genotypes and linolenic acid was lower in six of the nine genotypes under irrigation vs. rain fed treatments. 相似文献
12.
Drought stress limits crop growth and yield in soya bean (Glycine max [L.] Merr.), but there are relatively few tools available to assess the ability of different genotypes to tolerate drought. Aerial infrared image analysis was evaluated as a potential tool for identifying drought tolerance in soya bean. Drought effects were evaluated from late vegetative to mid‐reproductive stages of soya bean development in an experiment with ten genotypes including five slow‐ and five fast‐wilting genotypes that were from a population derived from Benning×PI416937. There were two deficit irrigation levels for 2 years and one deficit irrigation level for the third year along with a fully irrigated control level. When the canopy was completely closed, relative canopy temperature was determined using an infrared camera taken from an aerial platform 50–75 m above the experiment. As water availability decreased, the relative canopy temperature generally increased. Moreover, slow‐wilting soya bean genotypes generally had lower canopy temperature compared to fast‐wilting genotypes, and grain yield was generally positively associated with cool canopy temperatures. The results indicate that the determination of canopy temperature is a promising tool for rapid characterization of drought‐related traits in soya bean. 相似文献
13.
X. B. Liu S. J. Herbert Q. Y. Zhang A. M. Hashemi 《Journal of Agronomy and Crop Science》2007,193(1):55-62
Optimum plant population densities are a key means of achieving higher seed yield in soya bean [Glycine max (L.) Merr.]. Limited information is available on yield‐density relation of glyphosate‐resistant soya beans in north‐eastern USA. The objective of this research was to determine the appropriate populations for glyphosate‐resistant soya beans, and if the yield potential of glyphosate‐resistant soya bean produced in light‐enriched conditions was affected by populations. Eight glyphosate‐resistant soya bean cultivars with three populations (300 000, 500 000 and 800 000 plants ha−1) were grown under both ambient and light‐enriched conditions in 2002 and 2003. Yield of all cultivars responded to density linearly. As density increased, grain yield was increased by up to 92 % among cultivars. Light enrichment increased yield for all cultivars across the 2 years, although some cultivars were more sensitive. Harvest index either remained unchanged or declined slightly at higher density in 2002, and there was no difference among treatments in 2003. Both pod number and seed number per plant were significantly decreased with the increase of density across the 2 years, while seeds per pod declined slightly or remained unchanged. Greater seed size was obtained in higher density with varied degree depending on cultivars across the 2 years except for those cultivars with relatively larger seed. The increase in seed size by light enrichment was cultivar and density dependent, and varied between years. 800 000 plants ha−1 could be a suitable practice in producing higher yield in north‐east USA for glyphosate‐resistant soya bean. Maintaining the mass of an individual seed is an important strategy in achieving high yield at high population. Establishing mechanisms responsible for the greatest yields via high population under light‐enriched conditions, may provide insights for management and phenotypic improvement. 相似文献
14.
气相色谱法鉴别橄榄油掺伪的研究 总被引：1，自引：0，他引：1
应用气相色谱法分析测定橄榄油的脂肪酸组成,揭示橄榄油脂肪酸特征,并研究其掺入菜籽油、花生油、大豆油或精炼橄榄油时脂肪酸的变化规律,为橄榄油的掺伪鉴别提供参考依据。 相似文献
15.
Wilson Wagner Ribeiro Teixeira Rafael Battisti Paulo Cesar Sentelhas Milton Ferreira de Moraes Adilson de Oliveira Junior 《Journal of Agronomy and Crop Science》2019,205(5):533-544
Soya bean yield gap can be caused by different factors resulting in uncertainties when the objective is to use such information for farm decision‐making and reference yield determination. Thus, this study aimed to quantify the soya bean yield gap for four sites, located in Southern and Midwestern Brazil, as well as the uncertainties of that related to cultivars, sowing dates, soil types and reference yields. The crop simulation model DSSAT‐CSM‐CROPGRO‐Soybean was calibrated for cultivars with similar maturity groups, based on the data obtained from the best farmers at the county level. The yield gap by water deficit (YGWD) was obtained through the difference between potential and attainable yields, and that one caused by sub‐optimum crop management (YGCM) by subtracting actual yield of each county, obtained from official statistics between 1989/90 and 2014/15 growing seasons, from the estimated attainable yield. The yield was simulated using four sowing dates, three soil types and two soya bean maturity groups by county. The reference yield uncertainty was quantified using yield reference from crop model and regional winners of the soya bean yield context, conducted by CESB (Brazilian Soybean Strategic Committee), for the growing seasons from 2013/14 to 2015/16. The crop model showed a good agreement between measured and simulated crop development and growth using calibration by maturity group, with low root mean square error (347 kg/ha). Southern sites had a mean YGWD of 1,047 kg/ha, while in the Midwest, it was lower than 100 kg/ha. The YGCM was 1,067, 528, 984 and 848 kg/ha, respectively, for Castro, PR, Mamborê, PR, Montividiu, GO and Primavera do Leste, MT, representing the opportunity for yield gain when having the best farmers as reference. The maturity groups, sowing dates and soil types showed to be an important source of uncertainty for yield gap determination, being recommended to investigate the farms in detail for an appropriate quantification. The reference yield showed expressive uncertainties, with some farmers presenting conditions to increase their soya bean yields by more than 3,000 kg/ha, when considering as reference the yields obtained by the winners’ farmers. These results show that uncertainties must be reduced when assessing farm yield gaps, in order to ensure that expected rate of soya bean yield growth could be reached by adopting the same technologies from CESB winners and best farmers in the county as a reference. 相似文献
16.
建立中性纤维素酶活力测定的标准不确定度评定的数学模型,通过分析并合成标准不确定度的各分量,根据JJF1059—1999测量不确定度评定与表示报告扩展不确定度结果。采用还原糖法测定中性纤维素酶活力,对建立的数学模型逐层展开了分析,并采用最小二乘法评定标准曲线的不确定度。结果表明,测定本方法所用的样品扩展不确定度为:U=40.8 U/g,k=1.960。该评定方法客观、有效,在实验室的检测工作中可提供参考。 相似文献
17.
Appropriate plant density is a key for gainful production of soya bean in various environments including the hot‐humid tropical environments (HHTE) of Ethiopia. A split‐plot factorial experiment was conducted under HHTE in south‐west Ethiopia to determine the effect of Variety (Clark, CSC‐1), Row spacing (50, 55, 60, 65, 70 cm) and Plant spacing (2.5, 5, 10 cm) on yield and yield components, and weed infestation of soya bean. The effect of Plant spacing was more Variety‐specific than that of Row spacing. Yield and yield components per m2 were significantly affected by both Row spacing and Plant spacing. However, per plant and per pod responses and weed infestation were affected mainly by Plant spacing, and not that much by Row spacing. Seed yield and yield components per m2 were the highest for the highest plant density (50 cm Row spacing, 2.5 cm Plant spacing), but individual plant and pod responses, and weed infestation were the highest for wider Plant spacing (10 cm). Regression analysis of various responses on planting density showed negative, cubic relationship albeit with different strength. This study demonstrated that these factors significantly modify soya bean yield and yield components as well as weed infestation, suggesting that they could be used as management tools for increased yield in HHTE. 相似文献
18.
毛霉型豆豉是我国传统的豆类发酵品,因其营养丰富、风味独特而深受消费者喜爱。通过综述毛霉型豆豉发酵工艺、微生物菌群研究,对其活性成分及保健功效进行阐述,并对安全性问题进行分析,对毛霉型豆豉今后的发展前景进行展望。 相似文献
19.
Jakub Kuczyński Tomasz Twardowski Jerzy Nawracała Joanna Gracz-Bernaciak Agata Tyczewska 《Journal of Agronomy and Crop Science》2020,206(6):759-772
Chilling stress is a major factor limiting the yield of soya bean [Glycine max (L.) Merr.] on a global scale. However, the regulatory network that controls the chilling response of soya bean remains unclear. In the present study, phenotyping and quantitative analyses of miRNAs in soya bean under chilling stress were carried out to determine the impact of environmental constraints on soya bean productivity. Measurements done during soya bean growth in chilling along with the results of field trials indicated that the cultivars Augusta and Fiskeby V responded differently to low temperatures. Although chilling affected the reproductive development of both cultivars, the final seed output remained unchanged. The differential expression of miR169, miR319, miR397 and miR398 under cold stress was detected using ddPCR. Upon chilling in the reproductive stage, we found that these miRNAs had contrasting expression profiles in Augusta and Fiskeby V. A set of candidate target genes was predicted based on degradome sequencing data. A negative correlation was found between the expression of miR169, miR319 and miR398 and their targets in the roots of both cultivars. Our work elucidates the impact of chilling stress on the productivity of two soya bean cultivars and reveals the importance of miRNA involvement in the low temperature response. 相似文献