计算溶液所需的质量、体积或浓度。
EnzymoPure™,天然 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。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。
| 项目 | 指标 |
|---|---|
| 容重 g/ml | ≤1.25 |
| pH(25℃) | 4.0-7.0 |
| 铅 (Pb)/(mg/kg) | ≤5.0 |
| 总砷 (以 As 计)/(mg/kg) | ≤3.0 |
| 菌落总数 /(CFU/mL) | ≤50000 |
| 大肠菌群 /(CFU/mL) | ≤30 |
| 大肠埃希氏菌 (CFU/mL)/(MPN/mL) | 不得检出 |
| 沙门氏菌 (25ml) | 不得检出 |
| 执行标准 | GB 1886.174《食品安全国家标准 食品添加剂 食品工业用酶制剂》的相关规定 |
作用机理
α- 乙酰乳酸是酵母合成缬氨酸的中间产物,麦汁中若没有足够的缬氨酸,酵母将启动自己的缬氨酸合成机制。在缬氨酸合成的生化途径中,α- 乙酰乳酸是前体物质,它很容易透出细胞进入发酵液中,在发酵正常情况下,α- 乙酰乳酸被慢慢自然氧化脱羧生成双乙酰,再由酵母还原酶将双乙酰还原成乙偶姻 (3 - 羟基 - 2 - 丁酮),如图 1 所示。
在发酵过程中加入 α- 乙酰乳酸脱羧酶,该酶可以催化 α- 乙酰乳酸直接氧化脱羧形成 3 - 羟基 - 2 - 丁酮,省却了形成双乙酰再进一步降解的中间步骤,即图 1 所示的快反应,该反应比自然氧化脱羧的慢反应快约 10 倍。因此,在发酵过程中加入 α- 乙酰乳酸脱羧酶不仅大大降低了双乙酰的峰值和在酒液中的含量,更缩短了发酵周期,提高设备的利用。

图 1 α- 乙酰乳酸的去除途径
使用安全
酶制剂是蛋白质,吸入灰尘或悬浮微粒可能会产生过敏作用,导致人们产生过敏反应。如果长时间接触某些酶,可能会刺激皮肤、眼睛和粘膜;飞溅和强烈搅动可能造成可吸入的粉尘。建议穿戴具有保护作用的衣服、手套和眼睛或脸部保护物。
注意 / 贮存
每次开袋或开瓶后,若未使用完,应扎紧袋口或拧紧瓶盖,以免有效活性成分失活。本产品为活性生物制剂,运输、贮存过程中应避光、低温、干燥、通风。
α-Acetolactate decarboxylase is a high-efficiency yellow liquid biological preparation refined by liquid deep fermentation, ultrafiltration and other processes using excellent Bacillus subtilis strains. This enzyme can catalyze the decarboxylation of α-acetolactate to produce acetoin and carbon dioxide, and can be widely used in food processing.
Basic Information
Product Name: α-Acetolactate Decarboxylase
Ingredient List: α-Acetolactate decarboxylase, Excipient: Glycerol
Operating Conditions: Temperature range: 4℃-70℃; pH range: 3.0-7.5
Addition Amount: Recommended amount: 5-500g/ton
Product Appearance: Light yellow, brown to brown liquid
* Due to differences in raw material composition and process parameters of different factories, the actual addition method and amount of this product should be determined through experiments.
Due to the influence of fermentation raw materials, cycles and other factors, the color may vary slightly, but it will not affect the use effect.
Product Standards
| Item | Index |
|---|---|
| Bulk Density g/ml | ≤1.25 |
| pH(25℃) | 4.0-7.0 |
| Lead (Pb)/(mg/kg) | ≤5.0 |
| Total Arsenic (as As)/(mg/kg) | ≤3.0 |
| Total Plate Count/(CFU/mL) | ≤50000 |
| Coliforms/(CFU/mL) | ≤30 |
| Escherichia coli (CFU/mL)/(MPN/mL) | Not Detected |
| Salmonella (25ml) | Not Detected |
| Execution Standard | Relevant provisions of GB 1886.174 National Food Safety Standard - Food Additives - Enzymes for Food Industry |
Mechanism of Action
α-Acetolactate is an intermediate product in the synthesis of valine by yeast. If there is not enough valine in the wort, yeast will activate its own valine synthesis mechanism. In the biochemical pathway of valine synthesis, α-acetolactate is a precursor substance, which easily penetrates out of the cells into the fermentation broth. Under normal fermentation conditions, α-acetolactate is slowly oxidized and decarboxylated naturally to form diacetyl, which is then reduced by yeast reductase to acetoin (3-hydroxy-2-butanone), as shown in Figure 1.
When α-acetolactate decarboxylase is added during fermentation, this enzyme can catalyze the direct oxidative decarboxylation of α-acetolactate to form 3-hydroxy-2-butanone, eliminating the intermediate step of forming diacetyl and then further degrading, i.e., the fast reaction shown in Figure 1. This reaction is about 10 times faster than the slow reaction of natural oxidative decarboxylation. Therefore, adding α-acetolactate decarboxylase during fermentation not only greatly reduces the peak value and content of diacetyl in the wine liquid, but also shortens the fermentation cycle and improves the utilization of equipment.
Figure 1 Removal Pathway of α-Acetolactate
Safety in Use
Enzymes are proteins. Inhaling dust or suspended particles may cause allergic reactions. Prolonged contact with certain enzymes may irritate the skin, eyes and mucous membranes. Splashing and strong agitation may generate inhalable dust. It is recommended to wear protective clothing, gloves and eye or face protection.
Precautions/Storage
After each opening of the bag or bottle, if not used up, the bag mouth should be tightly tied or the bottle cap should be tightly closed to prevent the active ingredients from inactivating. This product is an active biological preparation and should be protected from light, kept at low temperature, dry and ventilated during transportation and storage.
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| 批号(Lot Number) | 证书类型 | 货号 |
|---|---|---|
| 分析证书 | A1418588 | |
| 分析证书 | A1418588 |