CN111157324A - 食品中亚硝酸盐的测定前处理方法 - Google Patents
食品中亚硝酸盐的测定前处理方法 Download PDFInfo
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- CN111157324A CN111157324A CN201911416268.2A CN201911416268A CN111157324A CN 111157324 A CN111157324 A CN 111157324A CN 201911416268 A CN201911416268 A CN 201911416268A CN 111157324 A CN111157324 A CN 111157324A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
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- G01N2001/4088—Concentrating samples by other techniques involving separation of suspended solids filtration
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Abstract
本发明涉及一种食品中亚硝酸盐的测定前处理方法,包括如下步骤:称取适量样品,置于具塞锥形瓶中,加入饱和硼砂溶液,再加入70℃的水混匀,于沸水浴中加热15min,取出置冷水浴中冷却,并放置至室温;定量转移提取液至容量瓶中,加入亚铁氯化钾溶液,再加入乙酸锌溶液,摇匀,并置于离心机中离心过滤;继续加入亚铁氯化钾溶液及乙酸锌溶液,进行二次离心过滤,以沉淀蛋白质;加水至刻度,摇匀,加入活性炭进行物理吸附,加入氢氧化铝进行悬浮液吸附,加入正己烷提取色素,除去杂质,上清液用滤纸过滤,弃去初滤液,滤液备用。本发明针对现有技术中的缺陷,可以将食品中的各种杂质、基底颜色去除,从而大大提高了检测精度。
Description
技术领域:
本发明涉及食品检测技术领域,尤其涉及一种食品中亚硝酸盐的测定前处理方法。
背景技术:
《GB 5009.33-2016 食品安全国家标准 食品中亚硝酸盐与硝酸盐的测定 第二法分光光度法》中12.2.4:对于其他样品的前处理方法为“定量转移提取液至200ml容量瓶中,加入5ml亚铁氯化钾溶液,摇匀,再加入5ml 220g/L乙酸锌溶液,以沉淀蛋白质,加水至刻度,摇匀,放置30min,除去上层脂肪,上清液用滤纸过滤,弃去除滤液30ml,滤液备用。”
该方法具有如下缺点:1、滤液沉淀不完全或未沉淀导致过滤十分缓慢,甚至无法过滤;2、有些样品滤液基底有颜色导致滤液无法检测比色。
发明内容:
本发明的目的是针对现有技术的缺陷,提供一种检测精度高的食品中亚硝酸盐的测定前处理方法。
本发明是通过如下技术方案实现的:
一种食品中亚硝酸盐的测定前处理方法,包括如下步骤:
(1)称取适量样品,置于具塞锥形瓶中,加入饱和硼砂溶液,再加入70℃的水混匀,于沸水浴中加热15min,取出置冷水浴中冷却,并放置至室温;
(2)定量转移提取液至容量瓶中,加入亚铁氯化钾溶液,再加入乙酸锌溶液,摇匀,并置于离心机中离心过滤;
(3)继续加入亚铁氯化钾溶液及乙酸锌溶液,进行二次离心过滤,以沉淀蛋白质;
(4)加水至刻度,摇匀,加入活性炭进行物理吸附,加入氢氧化铝进行悬浮液吸附,加入正己烷提取色素,除去杂质,上清液用滤纸过滤,弃去初滤液,滤液备用。
本发明食品中亚硝酸盐的测定前处理方法的有益效果是:本发明针对现有技术中的缺陷,可以将食品中的各种杂质、基底颜色去除,从而大大提高了检测精度。
具体实施方式:
下面对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易被本领域人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
本发明提供一种食品中亚硝酸盐的测定前处理方法,包括如下步骤:
(1)称取5g样品,置于250mL具塞锥形瓶中,加入12.5mL 50g/L饱和硼砂溶液,再加入70℃左右的水约150ml混匀,于沸水浴中加热15min,取出置冷水浴中冷却,并放置至室温;
(2)定量转移提取液至200mL容量瓶中,加入5mL 106g/L亚铁氯化钾溶液,再加入5mL220g/L乙酸锌溶液,摇匀,并置于离心机中离心30min,过滤;
(3)继续加入亚铁氯化钾溶液及乙酸锌溶液,进行二次离心过滤,以沉淀蛋白质;
(4)加水至刻度,摇匀,加入活性炭进行物理吸附,加入氢氧化铝进行悬浮液吸附,加入正己烷提取色素,除去杂质,上清液用滤纸过滤,弃去初滤液,滤液备用。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。
Claims (1)
1.一种食品中亚硝酸盐的测定前处理方法,其特征在于,包括如下步骤:
(1)称取适量样品,置于具塞锥形瓶中,加入饱和硼砂溶液,再加入70℃的水混匀,于沸水浴中加热15min,取出置冷水浴中冷却,并放置至室温;
(2)定量转移提取液至容量瓶中,加入亚铁氯化钾溶液,再加入乙酸锌溶液,摇匀,并置于离心机中离心过滤;
(3)继续加入亚铁氯化钾溶液及乙酸锌溶液,进行二次离心过滤,以沉淀蛋白质;
(4)加水至刻度,摇匀,加入活性炭进行物理吸附,加入氢氧化铝进行悬浮液吸附,加入正己烷提取色素,除去杂质,上清液用滤纸过滤,弃去初滤液,滤液备用。
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111678759A (zh) * | 2020-06-19 | 2020-09-18 | 四川精创检测技术有限公司 | 一种废水氯化物测定的样品前处理方法 |
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CN111678759A (zh) * | 2020-06-19 | 2020-09-18 | 四川精创检测技术有限公司 | 一种废水氯化物测定的样品前处理方法 |
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