计算溶液所需的质量、体积或浓度。
BioReagent 级 ,适用于对基线干扰要求严格的色谱和分析工作流程。
2-8°C储存,避光。低温运输 。请查阅批次 COA 获取详细规格。
SDS、COA、产品数据表及规格说明书均可下载。可通过批号查询获取批次 COA。
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。
乙酰胆碱(Ach)是研究最早的神经递质,是许多周围神经如运动神经、植物性神经系统节前纤维和副交感神经节后纤维的兴奋性神经递质。乙酰胆碱与底物液反应,通过显色反应生成棕色化合物,测定其吸光度 OD 值,其颜色深浅与乙酰胆碱浓度成正比。
试剂盒的组成和配制:
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实验器材:
研钵(匀浆机)、冰盒(制冰机)、台式离心机、可调式移液枪、水浴锅(烘箱、培养箱、金属浴)、1ml 比色皿、离心管、分光光度计、蒸馏水(去离子水、超纯水均可)。
指标测定:
建议先选取 1-3 个差异大的样本(例如不同类型或分组)进行预实验,熟悉操作流程,根据预实验结果确定或调整样本浓度,以防造成样本或试剂不必要的浪费!
1、样本提取:
① 组织样本:取约 0.1g 组织,加入 1mL 提取液,进行冰浴匀浆。12000rpm,4℃离心 10min,取上清,置冰上待测。
【注】:若增加加样本量,可按照组织质量(g):提取液体积 (mL) 为 1:5~10 的比例进行提取。
② 细菌或细胞:先收集细菌或细胞到离心管内,离心后弃上清;取约 500 万细菌或细胞,加入 1mL 提取液,超声波破碎细菌或细胞(冰浴,功率 20% 或 200W,超声 3s,间隔 10s,重复 30 次);12000rpm,4℃离心 10min,取上清,置冰上待测。
【注】:若增加样本量,可按照细菌 / 细胞数量 (10⁴):提取液 (mL) 为 500~1000:1 的比例进行提取。
③ 液体样本:直接检测;若浑浊,离心后取上清检测。
2、检测步骤:
① 分光光度计预热 30min,调节波长到 540 nm。
② 所有试剂解冻至室温(25℃)。在 EP 管中依次加入:
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【注】
1. 若 ΔA 较小,可以增加样本量 V1(由 100μL 增至 200μL,则水相应减少),则改变后的 V1 需重新代入公式计算。
2.ΔA 最好控制在标准曲线的线性范围内,若 ΔA 的值超过 1.2,可对样本进行稀释再测定,稀释倍数 D 代入计算公式计算;或减少样本量 V1(如减至 50μL,则水相应增加),则改变后的 V1 和稀释倍数 D 需重新代入公式计算。
结果计算:
1、标准曲线方程为 y = 6.2507x - 0.0252; x 为标准品质量(mg),y 为 ΔA。

2、按照样本质量计算:
乙酰胆碱含量 (mg/g 重量)=[(ΔA+0.0252)÷6.2507]÷(W×V1÷V)×D =1.6×(ΔA+0.0252)÷W×D
3、按照样本蛋白浓度计算:
乙酰胆碱含量 (mg/mg prot)=[(ΔA+0.0252)÷6.2507]÷(Cpr×V1÷V)×D =1.6×(ΔA+0.0252)÷Cpr×D
4、按细胞数量计算:
乙酰胆碱含量 (μg/10⁴cell)=[(ΔA+0.0252)÷6.2507×10³]÷(500×V1÷V)×D =1600×(ΔA+0.0252)÷500×D
5、按液体体积计算:
乙酰胆碱含量 (mg/mL)=[(ΔA+0.0252)÷6.2507]÷V1×D=1.6×(ΔA+0.0252)×D
参数释义:
W--- 样品质量,g;
V--- 提取液体积,1 mL;
V1--- 上清液体积(mL),0.1mL;
500--- 细胞数量,万;
D--- 稀释倍数,未稀释即为 1;
Cpr--- 蛋白浓度(mg/mL);建议使用本公司的 BCA 蛋白含量检测试剂盒。
附:标准曲线制作过程:
1、称取 2mg 标准品至 EP 管中,加入 1mL 水溶解成 2mg/mL 标准母液,(现配现用,两天内用完),将母液用蒸馏水稀释成六个浓度梯度的标准品,例如:0,0.4,0.8,1.2,1.6,2 mg/mL。也可根据实际样本调整标准品浓度。
2、标品稀释参照表如下:
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3、 依据测定管加样表操作,根据结果,以各浓度吸光值减去 0 浓度吸光值,过 0 点制作标准曲线。
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Acetylcholine (Ach) is the earliest discovered neurotransmitter and an excitatory neurotransmitter for multiple peripheral nerves, including motor nerves, preganglionic fibers of the autonomic nervous system and postganglionic parasympathetic nerve fibers. Ach reacts with substrate solution to form brown compounds via chromogenic reaction; the absorbance (OD value) is measured, and color intensity is positively correlated with Ach concentration.
Kit Composition & Preparation
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Required Lab Equipment
Mortar/homogenizer, ice box/ice maker, bench-top centrifuge, adjustable micropipette, water bath/incubator/dry block heater, 1 mL cuvette, centrifuge tubes, spectrophotometer, distilled water (deionized or ultrapure water acceptable).
Sample Assay Protocol
Pre-test recommendation: Run pilot assay with 1–3 samples of distinct groups to optimize loading volume and avoid unnecessary waste of samples and reagents.
1. Sample Extraction
① Tissue samples: Weigh ~0.1 g tissue, add 1 mL extraction solution, homogenize on ice. Centrifuge at 12000 rpm, 4 ℃ for 10 min, collect supernatant and keep on ice for testing.
Note: For increased loading, extract at tissue weight (g) : extraction solution (mL)=1 : 5~10.
② Cells/Bacteria: Pellet cells/bacteria by centrifugation and discard supernatant; take ~5×10⁶ cells, add 1 mL extraction solution, lyse on ice via sonication (20%/200 W power, 3 s pulse, 10 s interval, repeat 30 cycles). Centrifuge at 12000 rpm, 4 ℃ for 10 min, collect supernatant on ice.
Note: For increased loading, extract at cell count (10⁴) : extraction solution (mL)=500~1000 : 1.
③ Liquid samples: Test directly; centrifuge turbid samples and collect supernatant before detection.
2. Colorimetric Assay
① Pre-warm spectrophotometer for 30 min and set wavelength to 540 nm.
② Equilibrate all reagents to room temperature (25 ℃), dispense into EP tubes as below:
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Notes:
Calculation Formulas
1. Standard curve: y = 6.2507x - 0.0252; x=standard mass (mg), y=ΔA

2. By tissue weight: Ach content (mg/g tissue)=[(ΔA+0.0252)÷6.2507]÷(W×V1÷V)×D=1.6×(ΔA+0.0252)÷W×D
3. By total protein: Ach content (mg/mg protein)=[(ΔA+0.0252)÷6.2507]÷(Cpr×V1÷V)×D=1.6×(ΔA+0.0252)÷Cpr×D
4. By cell count: Ach content (μg/10⁴ cells)=[(ΔA+0.0252)÷6.2507×10³]÷(500×V1÷V)×D=1600×(ΔA+0.0252)÷500×D
5. By liquid volume: Ach content (mg/mL)=[(ΔA+0.0252)÷6.2507]÷V1×D=1.6×(ΔA+0.0252)×D
Parameter Definition:
W=sample weight (g);
V=total extraction volume (1 mL);
V1=supernatant loading volume (0.1 mL);
500=cell count (×104);
D=dilution factor (D=1 without dilution);
Cpr=sample protein concentration (mg/mL); BCA protein quantification kit from our company is recommended.
Appendix: Standard Curve Preparation
1. Weigh 2 mg standard powder into EP tube, dissolve in 1 mL water to prepare 2 mg/mL stock solution (prepare fresh, use within 48 h). Serially dilute stock to 6 concentrations: 0, 0.4, 0.8, 1.2, 1.6, 2 mg/mL (adjust concentration range per actual sample).
1. Weigh 2 mg standard powder into EP tube, dissolve with 1 mL distilled water to prepare 2 mg/mL standard stock solution (prepare freshly, use within 2 days). Serially dilute stock solution with distilled water to six gradient concentrations: 0, 0.4, 0.8, 1.2, 1.6, 2 mg/mL. Adjust concentrations according to actual sample condition if needed.
2. Standard dilution table:
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3. Dispense reagents following table below, calculate ΔA by subtracting absorbance of zero-concentration blank, then plot zero-based standard curve.
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| A1521781 | 组件 | 物理外观 | 24T/24S | 储存 |
| A1521781A | 提取液 | 液体 | 30ml | 2-8℃. |
| A1521781B | 试剂一 | 固体 | 1瓶 | 2-8℃. |
| A1521781C | 试剂二 | 液体 | 5ml | 2-8℃. |
| A1521781D | 试剂三 | 液体 | 4ml | 2-8℃. 避光 |
| A1521781E | 试剂四 A | 固体 | 3支 | 2-8℃. 避光 |
| A1521781F | 试剂四 B | 液体 | 4ml | 2-8℃. 避光 |
| A1521781G | 标准品 | 固体 | 1支 | 2-8℃. 避光 |
通过匹配包装上的批号来查找并下载产品的 COA,每批产品都进行了严格的验证,您可放心使用!
| 批号(Lot Number) | 证书类型 | 货号 |
|---|---|---|
| 分析证书 | A1521781 |