WO2017114441A1 - 一种检测腐竹中甲醛含量的方法 - Google Patents

一种检测腐竹中甲醛含量的方法 Download PDF

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WO2017114441A1
WO2017114441A1 PCT/CN2016/112832 CN2016112832W WO2017114441A1 WO 2017114441 A1 WO2017114441 A1 WO 2017114441A1 CN 2016112832 W CN2016112832 W CN 2016112832W WO 2017114441 A1 WO2017114441 A1 WO 2017114441A1
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sample
formaldehyde
ultrasonic
filtrate
mins
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PCT/CN2016/112832
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田琳琳
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田琳琳
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • G01N2030/022Column chromatography characterised by the kind of separation mechanism
    • G01N2030/027Liquid chromatography

Definitions

  • the present invention relates to a detection method, and more particularly to a method for detecting formaldehyde content in yuba, belonging to the field of food safety detection.
  • Yuba is obtained by soaking the fat and soy protein conjunctiva of the soy bean after soymilk. As the long-term thickening of the conjunctiva is reduced, the carbohydrate-based substance will undergo a "browning reaction” or even blackening. Adding a highly reproducible hanging white block can play a role of "bleaching", which changes the color and increases the yield.
  • the hanging white block is an industrial raw material. In the printing and dyeing industry, synthetic rubber is used as a reduction catalyst, and it is decomposed under acidic conditions to produce formaldehyde. The World Health Organization determines formaldehyde as a carcinogenic, teratogenic substance and a recognized source of allergic reaction. Therefore, it is forbidden to use white slabs or formaldehyde for food processing in both domestic and foreign countries.
  • the technical problem to be solved by the present invention is to provide a method for detecting formaldehyde content in yuba, which can quickly and accurately detect formaldehyde content in yuba, and the accuracy and credibility of the results. High, short test time, simple test method, low cost and safe operation.
  • the technical solution adopted by the present invention is a method for detecting formaldehyde content in yuba, comprising the following steps:
  • the method for detecting formaldehyde content in yuba is characterized in that the stabilizer is di-n-octyltin dilaurate or bismuth pentoxide.
  • the sample of the invention is subjected to drying and ultrasonic water bath digestion, and the product does not need organic solvent extraction, thereby reducing the loss of the derivative product, reducing the labor intensity, saving the medicine, shortening in the daytime, and detecting the method.
  • the results meet the analytical requirements of the sample and achieve the purpose of rapid detection.
  • Embodiment 1 is a method for detecting formaldehyde content in yuba, comprising the following steps: 1) weighing 10 g of yuba sample, adding a small amount of stabilizer, namely di-n-octyl dilaurate, and shaking and standing at 30 50min; 5) add 10ml of deionized water, ultrasonic extraction in an ultrasonic cleaner, take the filtrate; 3) put it into the ultrasonic oscillator for 20min; 4) take the filtrate 5mL into the volumetric flask, then Add ammonium ferric sulfate powder, gently shake the volumetric flask until the powder is completely dissolved; 5) Place it in a 100-degree water bath and heat it for 35 minutes; 6) Remove the sample solution after the reaction, let stand for 15 minutes and filter through the microporous membrane; 7) The peak area of formaldehyde was measured by a general-purpose liquid chromatography-ultraviolet detector, and converted to the concentration
  • Example 2 The present invention is a method for detecting formaldehyde content in yuba, comprising the following steps:
  • Example 3 is a method for detecting formaldehyde content in yuba, comprising the following steps:
  • the concentration of formaldehyde is subjected to drying and ultrasonic water bath digestion, and the product does not need organic solvent extraction, thereby reducing the loss of the derivative product, reducing the labor intensity, saving the medicine, shortening in the daytime, and the test result of the method conforms to the sample.
  • the analysis requires that the purpose of rapid detection is achieved.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

一种检测腐竹中甲醛含量的方法,包括以下步骤:称取10g的腐竹样品,加入少量稳定剂,摇匀静置在30-38度的环境下50min;加入10-15ml去离子水,置于超声波清洗机中超声萃取,取滤液;再将其放入超声波振荡器中20min;取滤液5ml至容量瓶中,然后加入硫酸铁铵粉末,轻摇容量瓶至粉末全部溶解;放置在100度水浴中避光加热35-50min;取出反应后的样液,静置15-25min后经微孔滤膜过滤。样品经过烘干、超声波水浴机消解后产物不需要有机溶剂萃取,减少了衍生产物的损失,降低了劳动强度,节约了药品,在时间上缩短了,该方法的检测实验结果符合样品的分析要求,达到了快速检测的目的。

Description

一种检测腐竹中甲醛含量的方法
技术领域
[0001] 本发明涉及一种检测方法, 尤其是涉及一种检测腐竹中甲醛含量的方法, 属于 食品安全检测领域。
背景技术
[0002] 腐竹是黄豆豆浆熬煮后, 所含的脂肪和大豆蛋白结膜捞出来晾干得到的。 随着 熬煮吋间加长结膜越捞越少, 剩下以碳水化合物为主的物质会发生"褐变反应", 甚至发黑。 添加还原性极强的吊白块, 可以起到"漂白"作用, 既改变了色泽, 也 增加了产量。 吊白块是一种工业原料, 在印染工业、 合成橡胶吋用作还原催化 齐 ij, 在酸性条件下分解产生甲醛, 世界卫生组织将甲醛确定为致癌、 致畸物质 和公认的变态反应源, 因此无论在国内国外, 都禁止将吊白块或甲醛用于食品 的加工处理。
技术问题
[0003] 针对现有技术存在的不足, 本发明所要解决的技术问题是, 提供一种检测腐竹 中甲醛含量的方法, 可现场快速、 准确检测腐竹中的甲醛含量, 结果准确性和 可信度高, 测试吋间短、 测试方法简单, 而且成本低廉、 操作安全。
问题的解决方案
技术解决方案
[0004] 为解决上述技术问题, 本发明采取的技术方案是, 一种检测腐竹中甲醛含量的 方法, 包括下列步骤:
1)称取 10g的腐竹样品, 加入少量稳定剂, 摇匀静置在 30-38度的环境下 50min;
[0005] 2)加 10-15ml去离子水, 置于超声波清洗机中超声萃取, 取滤液;
[0006] 3)再将其放入超声波振荡器中 20min;
[0007] 4)取滤液 5mL至容量瓶中, 然后加入硫酸铁铵粉末, 轻摇容量瓶至粉末全部溶 解;
[0008] 5)放置在 100度水浴中避光加热 35-50min; [0009] 6)取出反应后的样液, 静置 15-25min后经微孔滤膜过滤;
[0010] 7)采用通用型的液相色谱 -紫外检测器测定甲醛的峰面积, 用标准曲线校正方程 换算成甲醛的浓度。
[0011]
[0012] 优化的, 上述检测腐竹中甲醛含量的方法, 其稳定剂为二月桂酸二正辛基锡或 五硫醇锑。
发明的有益效果
有益效果
[0013] 本发明样品经过烘干、 超声波水浴机消解后产物不需要有机溶剂萃取, 减少了 衍生产物的损失, 降低了劳动强度, 节约了药品, 在吋间上缩短了, 该方法的 检测实验结果符合样品的分析要求, 达到了快速检测的目的。
实施该发明的最佳实施例
本发明的最佳实施方式
[0014] 实施例 1本发明为一种检测腐竹中甲醛含量的方法, 包括下列步骤: 1)称取 10g 的腐竹样品, 加入少量稳定剂即二月桂酸二正辛基锡, 摇匀静置在 30度的环境 下 50min; 2)加 10ml去离子水, 置于超声波清洗机中超声萃取, 取滤液; 3)再将 其放入超声波振荡器中 20min; 4)取滤液 5mL至容量瓶中, 然后加入硫酸铁铵粉 末, 轻摇容量瓶至粉末全部溶解; 5)放置在 100度水浴中避光加热 35min; 6)取 出反应后的样液, 静置 15min后经微孔滤膜过滤; 7)采用通用型的液相色谱-紫 外检测器测定甲醛的峰面积, 用标准曲线校正方程换算成甲醛的浓度。
本发明的实施方式
[0015] 实施例 2本发明为本发明为一种检测腐竹中甲醛含量的方法, 包括下列步骤:
1)称取 10g的腐竹样品, 加入少量稳定剂即二月桂酸二正辛基锡, 摇匀静置在 30 度的环境下 50min; 2)加 10ml去离子水, 置于超声波清洗机中超声萃取, 取滤液 ; 3)再将其放入超声波振荡器中 20min; 4)取滤液 5mL至容量瓶中, 然后加入硫 酸铁铵粉末, 轻摇容量瓶至粉末全部溶解; 5)放置在 100度水浴中避光加热 35min; 6)取出反应后的样液, 静置 15min后经微 孔滤膜过滤; 7)采用通用型的液相色谱 -紫外检测器测定甲醛的峰面积, 用标准 曲线校正方程换算成甲醛的浓度。
[0016] 实施例 3本发明为本发明为一种检测腐竹中甲醛含量的方法, 包括下列步骤:
1)称取 10g的腐竹样品, 加入少量稳定剂即五硫醇锑, 摇匀静置在 34度的环境下 5 Omin; 2)加 12ml去离子水, 置于超声波清洗机中超声萃取, 取滤液; 3)再将其 放入超声波振荡器中 20min; 4)取滤液 5mL至容量瓶中, 然后加入硫酸铁铵粉末 , 轻摇容量瓶至粉末全部溶解; 5)放置在 100度水浴中避光加热 42min; 6)取出 反应后的样液, 静置 18min后经微孔滤膜过滤; 7)采用通用型的液相色谱 -紫外 检测器测定甲醛的峰面积, 用标准曲线校正方程换算成甲醛的浓度。 本发明样 品经过烘干、 超声波水浴机消解后产物不需要有机溶剂萃取, 减少了衍生产物 的损失, 降低了劳动强度, 节约了药品, 在吋间上缩短了, 该方法的检测实验 结果符合样品的分析要求, 达到了快速检测的目的。
工业实用性
[0017] 当然, 上述说明并非是对本发明的限制, 本发明也并不限于上述举例, 本技术 领域的普通技术人员, 在本发明的实质范围内, 作出的变化、 改型、 添加或替 换, 都应属于本发明的保护范围。

Claims

权利要求书
[权利要求 1] 一种检测腐竹中甲醛含量的方法, 包括下列步骤: 1)称取 10g的腐竹 样品, 加入少量稳定剂, 摇匀静置在 30-38度的环境下 50min;
2)加 10-15ml去离子水, 置于超声波清洗机中超声萃取, 取滤液;
3)再将其放入超声波振荡器中 20min;
4)取滤液 5mL至容量瓶中, 然后加入硫酸铁铵粉末, 轻摇容量瓶至粉 末全部溶解;
5)放置在 100度水浴中避光加热 35-50min;
6)取出反应后的样液, 静置 15-25min后经微孔滤膜过滤;
7)采用通用型的液相色谱 -紫外检测器测定甲醛的峰面积, 用标准曲 线校正方程换算成甲醛的浓度。
[权利要求 2] 根据权利要求 1所述的检测腐竹中甲醛含量的方法, 其特征在于: 所 述稳定剂为二月桂酸二正辛基锡或五硫醇锑。
PCT/CN2016/112832 2015-12-30 2016-12-29 一种检测腐竹中甲醛含量的方法 WO2017114441A1 (zh)

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