计算溶液所需的质量、体积或浓度。
BioReagent,标曲法 级 ,适用于对基线干扰要求严格的色谱和分析工作流程。
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在色谱分析、有机合成和交叉偶联反应领域已被 0 篇同行评审文献引用。
动物或植物细胞发生氧化应激 (oxidative stress) 时,会发生脂质氧化。丙二醛 (Malondialdehyde, MDA) 是一种生物体脂质氧化的天然产物,一些脂肪酸氧化后逐渐分解为一系列包括 MDA 在内的复杂化合物,此时通过检测 MDA 的水平即可检测脂质氧化的水平,因此 MDA 的测定被广泛用作脂质氧化的指标。生物体内的一些其它生化反应也会产生 MDA,例如 thromboxane synthase 也可以催化产生,但只要在测定时设置适当对照即可观察到脂质氧化水平的变化。
食品丙二醛(MDA)检测试剂盒 (硫代巴比妥酸, 比色法) 的原理是食品或饲料中的丙二醛经三氯乙酸溶液提取后,与硫代巴比妥酸 (thiobarbituric acid, TBA) 作用产生红色化合物的显色反应,测定其在 532nm 波长处的吸光度值,再与系列标准进行比较定量,本产品不适用于细胞、血液等的丙二醛的测定。本产品仅用于科研领域,不宜用于临床诊断或其他用途
组分表
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自备材料
1、食品、饲料等待测样品、蒸馏水或去离子水
2、天平 (精确至 0.01g)、离心机、离心管或小试管、慢速定量滤纸
3、分光光度计、比色皿、水浴锅或恒温箱、恒温振荡器或匀浆器
操作步骤 (仅供参考)
1、配制 MDA 提取试剂 (1×):取 1 份 MDA 提取试剂 (2.5×),再加入 1.5 份蒸馏水混合即可。
2、配制 TBA 工作液:称取适量 TBA,用蒸馏水配制成浓度为 0.3%的 TBA 工作液。TBA 工作液需完全溶解后再使用,可以加热到 60℃促溶,并可通过反复剧烈 Vortex 促溶。配制好的 TBA 工作液 4℃避光保存,1 个月内有效。
3、制备样品 MDA 提取液:精确称取 0.50~1.00g 样品加入 10ml MDA 提取试剂 (1×),摇匀,(也可用匀浆器充分匀浆) 置于恒温振荡器上 50℃振摇 60min,取出冷却至室温,用
双层慢速定量滤纸过滤,取滤液备用;亦可采用 5000r/min 离心 15min,取上清液备
用,该上清液即为 MDA 提取液。
4、 稀释标准品:首先将 MDA 标准品(100μg/ml)用 MDA 提取试剂( 1×)稀释至 MDA 标准品(1.0μg/ml),4℃避光保存,2 周内有效。如果进行简易快速检测,可将标准品再稀释至0.20μg/ml;如果进行精确检测,则按下表稀释至 0.01、0.05、0.10、0.15、0.20、0.25、0.30μg/ml 等系列浓度梯度;低浓度的标准梯度需现用现配。
5、 MDA 加样:(如果样品 MDA 提取液颜色较深,可将其用 MDA 提取试剂( 1×)稀释至本底颜色较浅时再测定。如果样品 MDA 提取液无颜色,可不测定样品对照管。)
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6、MDA 测定:用分光光度计或酶标仪测定各管 532nm 处吸光度,如果不方便也可以测定 530~540nm 之间的吸光度,分别记为 A空白 、 A标准 、 A样品对照 、 A样品测定 。
标准品浓度 = 0.20μg/ml
V=样品 MDA 提取液定容体积(ml)
m=样品质量(g)
c=从标准曲线中得出的样品 MDA 浓度(μg/ml)
注意事项
1、上述低温试剂避免反复冻融,以免失效或效率下降。
2、如果没有分光光度计,也可以使用酶标仪测定,检测样品量会增加。
3、MDA 提取试剂含三氯乙酸,有腐蚀性,应小心操作。
4、待测样品尽量新鲜,提取后应尽快检测,以免活性下降。
5、待测 MDA 提取液如不能及时测定,应置于 - 20℃保存,4 天内稳定。
6、加热时务必注意避免液体暴沸溅出。如果使用加热块 (Heat block) 进行加热注意用重物压紧离心管盖;如果使用沸水浴,则需使用可把盖子锁死的离心管或螺旋盖离心管,或用 Parafilm 封住离心管口,用针头刺一小孔。最方便和准确的加热方法是使用带有热盖并可以加热的金属浴或者 0.5ml PCR 仪。
7、计算结果应以重复性条件下获得的两次独立测定结果的算术平均值表示,结果保留两位有效数字。
8、为了您的安全和健康,请穿实验服并戴一次性手套操作。
9、试剂开封后请尽快使用,以防影响后续实验效果。
参考标准曲线范围:测定 MDA 标准在 0.20μg/ml 时,通过酶标仪 540nm测定其吸光度多在 0.3~0.5 之间。MDA 标准在 0.01、0.05、0.10、0.15、0.20、0.25、0.30μg/ml 等系列浓度梯度时吸光度,据此作出其标准曲线如下:

注意:由于检测仪器和操作手法等条件的不同,参考值范围会有波动,该值仅供参考,对于要求精确计算 MDA 含量的,可以进行多点测定;根据测定经验显示,标准品浓度在0.05μg/ml 以下,标准曲线会有偏差。
When animal or plant cells undergo oxidative stress, lipid oxidation occurs. Malondialdehyde (MDA) is a natural product of lipid oxidation in organisms. Upon oxidation, some fatty acids gradually decompose into a series of complex compounds including MDA. The level of lipid oxidation can therefore be evaluated by measuring MDA concentration, and MDA quantification is widely used as an indicator for lipid oxidation. MDA can also be generated via other biochemical reactions in vivo, for example, catalyzed by thromboxane synthase. Changes in lipid oxidation levels can still be monitored by setting appropriate controls during measurement.
The principle of the Food Malondialdehyde (MDA) Assay Kit (TBA, Colorimetric Method) is as follows: malondialdehyde in food or feed samples is extracted with trichloroacetic acid solution and reacts with thiobarbituric acid (TBA) to form a red‑colored chromogenic complex. The absorbance is measured at 532 nm, and quantification is achieved by comparison against serial standards. This kit is **not suitable for MDA determination in cells, blood or other such samples**. This product is for research‑use only; it shall not be used for clinical diagnosis or any other purposes.
Component
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Reagents, consumables and Equipments not provided
1. Test samples such as food or feed, distilled water or deionized water
2. Balance (readability: 0.01 g), centrifuge, centrifuge tubes or small test tubes, slow‑speed quantitative filter paper
3. Spectrophotometer, cuvettes, water bath or incubator, thermostatted shaker or homogenizer
Procedure (For Reference Only)
1. Prepare 1× MDA Extraction Reagent: Mix 1 volume of 2.5× MDA Extraction Reagent with 1.5 volumes of distilled water.
2. Prepare TBA Working Solution: Weigh an appropriate amount of TBA and dissolve in distilled water to obtain 0.3 % TBA working solution. Ensure complete dissolution before use. Dissolution may be facilitated by heating to 60 °C or repeated vigorous vortexing. Prepared TBA working solution is stored at 4 °C protected from light and is valid for 1 month.
3. Prepare sample MDA extract: Accurately weigh 0.50‑1.00 g sample and add 10 mL of 1× MDA Extraction Reagent. Mix well (full homogenization with a homogenizer is optional). Incubate on a thermostatted shaker at 50 °C for 60 min. Cool to room temperature. Filter through double‑layer slow‑speed quantitative filter paper and retain the filtrate. Alternatively, centrifuge at 5000 r/min for 15 min and collect the supernatant as the MDA extract.
4. Dilute standard: First dilute MDA Standard (100 μg/mL) with 1× MDA Extraction Reagent to prepare MDA Standard (1.0 μg/mL). Store at 4 °C protected from light; valid for 2 weeks.
- For rapid screening: further dilute the standard to 0.20 μg/mL.
- For precise measurement: prepare serial dilutions at 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30 μg/mL. Low‑concentration standard gradients shall be freshly prepared before use.
5. Sample loading: (If the MDA extract exhibits strong intrinsic color, dilute it with 1× MDA Extraction Reagent to reduce background color prior to measurement. If the extract is color‑free, the sample control tube may be omitted.)
Note: Mix thoroughly after sample loading, cap tightly, boil in a 90°C water bath for 30 min, then cool to room temperature in cold water bath or running water. |
6. MDA measurement: Measure absorbance of each tube at 532 nm using a spectrophotometer or microplate reader. Absorbance between 530‑540 nm is acceptable if 532 nm is unavailable. Record values as ABlank, AStandard, ASample‑Control, ASample‑Assay.
Calculations
- For rapid screening: calculate sample MDA concentration directly using the 0.20 μg/mL standard.
- For precise quantification: construct a standard curve with MDA standard concentration on the x‑axis and corrected absorbance
Standard concentration = 0.20 μg/mL
V = Final volume of sample MDA extract (mL)
m = Sample mass (g)
c = Sample MDA concentration read from standard curve (μg/mL)
Notes
1. Avoid repeated freeze‑thaw cycles for low‑temperature‑stored reagents to prevent loss of activity or performance degradation.
2. A microplate reader may substitute for a spectrophotometer; larger sample consumption will be required.
3. MDA Extraction Reagent contains trichloroacetic acid and is corrosive. Handle with care.
4. Use fresh samples whenever possible. Perform measurement promptly after extraction to prevent activity loss.
5. If MDA extracts cannot be assayed immediately, store at −20 °C; stable for up to 4 days.
6. Prevent bumping and splashing during heating. When using a heat block, weigh down tube caps. For boiling‑water baths, use lock‑lid or screw‑cap centrifuge tubes, or seal tube openings with Parafilm pierced with a small needle hole. The most convenient and accurate heating option is a heated metal bath with heated lid or a 0.5 mL PCR instrument.
7. Report results as the arithmetic mean of two independent replicate determinations under repeatability conditions; retain two significant figures.
8. Wear laboratory coat and disposable gloves for personal safety.
9. Use reagents promptly after opening to avoid compromised experimental performance.
Reference Standard Curve Range
For 0.20 μg/mL MDA standard, typical absorbance measured at 540 nm on a microplate reader ranges from 0.3‑0.5. Absorbance values are obtained for serial MDA standards at 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30 μg/mL for plotting the standard curve.

Note: Reference values may vary depending on instrument and operating technique and are for guidance only. Multiple‑point calibration is recommended for high‑precision MDA quantification. Experience indicates deviation of the standard curve occurs at standard concentrations below 0.05 μg/mL.
| 储运单元货号 | 储运单元名称 | 组分货号 | 组分名称 | 物理外观 | 50T | 储存 |
| F1527333NT | 食品丙二醛(MDA)检测试剂盒(硫代巴比妥酸, 比色法)(2-8°C组分) | F1527333A | MDA 提取试剂( 2.5×) | 液体 | 250ml | 2-8°C,避光 |
| F1527333B | 硫代巴比妥酸(TBA) | 固体 | 0.3g | 2-8°C,避光 | ||
| F1527333DT | 食品丙二醛(MDA)检测试剂盒 (硫代巴比妥酸, 比色法)(-20℃组分) | F1527333C | MDA 标准品(100μg/ml) | 液体 | 0.5ml | -20°C,避光 |