一、認(rèn)識山梨酸鉀?

1、 Get to know potassium sorbate

山梨酸鉀，又名 2，4 - 己二烯酸鉀，是山梨酸的鉀鹽，分子式為 C?H?O?K 。從外觀上看，它是無色或類白色鱗片狀或顆粒狀結(jié)晶，也可能呈現(xiàn)為結(jié)晶性粉末，無臭或者稍有臭味。山梨酸鉀易溶于水，在乙醇中微溶，不過在空氣中不太穩(wěn)定，容易被氧化從而發(fā)生著色現(xiàn)象，還具有一定的吸濕性。?

Potassium sorbate, also known as potassium 2,4-hexadienate, is the potassium salt of sorbic acid with the molecular formula C ? H ? O ? K. From the appearance, it appears as colorless or off white flaky or granular crystals, or as crystalline powder, odorless or slightly odorous. Potassium sorbate is easily soluble in water and slightly soluble in ethanol, but it is not very stable in air and is prone to oxidation, resulting in coloring. It also has a certain degree of hygroscopicity. ?

從化學(xué)結(jié)構(gòu)來看，其分子中羧基的 α、β 位和 γ、δ 位存在兩個(gè)雙鍵，這兩個(gè)雙鍵會產(chǎn)生共軛作用。其中，遠(yuǎn)離羧基的雙鍵易發(fā)生氧化，同時(shí)分子中的兩個(gè)雙鍵也容易與其他游離基結(jié)合。當(dāng)它與食品中的微生物酶系統(tǒng)里的巰基結(jié)合時(shí)，能夠破壞酶系，進(jìn)而達(dá)到抑制微生物繁殖以及防腐的目的。?

From a chemical structure perspective, there are two double bonds at the alpha, beta, gamma, and delta positions of the carboxyl group in its molecule, which undergo conjugation. Among them, the double bonds far from the carboxyl group are prone to oxidation, and the two double bonds in the molecule are also prone to binding with other free radicals. When it binds with thiol groups in the microbial enzyme system of food, it can destroy the enzyme system, thereby achieving the purpose of inhibiting microbial reproduction and preservation. ?

二、山梨酸鉀的抑菌機(jī)制?

2、 The antibacterial mechanism of potassium sorbate

山梨酸鉀及其溶于水生成的山梨酸具有相同的抑菌機(jī)制，都是通過與霉菌、酵母菌酶系統(tǒng)中的巰基相結(jié)合，從而達(dá)到抑菌效果。但需要注意的是，它對厭氧芽孢桿菌和乳酸菌并沒有抑制作用。山梨酸屬于直鏈不飽和脂肪酸，它能夠參與人體內(nèi)正常的代謝過程，并被同化產(chǎn)生二氧化碳和水，幾乎對人體沒有毒性，相較于苯甲酸等其他防腐劑而言，安全性更高。?

Potassium sorbate and its water-soluble form of sorbic acid have the same antibacterial mechanism, which is achieved by binding with thiol groups in the enzyme systems of fungi and yeast. However, it should be noted that it has no inhibitory effect on anaerobic Bacillus and lactic acid bacteria. Sorbic acid is a straight chain unsaturated fatty acid that can participate in normal metabolic processes in the human body and be assimilated to produce carbon dioxide and water. It is almost non-toxic to the human body and has higher safety compared to other preservatives such as benzoic acid. ?

三、廣泛的應(yīng)用領(lǐng)域?

3、 Widely applicable fields

食品行業(yè)：山梨酸鉀堪稱食品行業(yè)的首選防腐劑，具有廣譜的抑菌效果。它在酸性環(huán)境下抑菌作用更強(qiáng)，屬于酸性防腐劑，常配合有機(jī)酸使用，以此提高防腐反應(yīng)效果。無論是肉、魚、蛋、禽類制品，還是果蔬類，又或是飲料、果凍、軟糖、糕點(diǎn)等，都能看到山梨酸鉀的身影。例如，在飲料中添加山梨酸鉀，可以有效延長飲料的保質(zhì)期，讓消費(fèi)者在較長時(shí)間內(nèi)都能享受到品質(zhì)穩(wěn)定的飲品；在果醬中，山梨酸鉀能抑制霉菌和酵母菌的生長，防止果醬變質(zhì)，保持其美味口感和良好質(zhì)地。在食品生產(chǎn)過程中，山梨酸鉀濃縮水溶液（山梨酸鉀約 50% w/v）可添加到液體食品中，也可稀釋后用于食品保存過程中的浸泡或噴霧處理。與同類產(chǎn)品相比，山梨酸鉀更為高效，其活性相當(dāng)于同等重量山梨酸的 74%。?

Food industry: Potassium sorbate is the preferred preservative in the food industry, with broad-spectrum antibacterial effects. It has a stronger antibacterial effect in acidic environments and belongs to acidic preservatives. It is often used in combination with organic acids to improve the anti-corrosion reaction effect. Whether it's meat, fish, eggs, poultry products, fruits and vegetables, beverages, jellies, gummies, pastries, etc., the presence of potassium sorbate can be seen. For example, adding potassium sorbate to beverages can effectively extend their shelf life, allowing consumers to enjoy stable quality drinks for a longer period of time; In jam, potassium sorbate can inhibit the growth of mold and yeast, prevent jam from spoiling, and maintain its delicious taste and good texture. In the process of food production, the concentrated aqueous solution of potassium sorbate (about 50% w/v of potassium sorbate) can be added to liquid food, or diluted and used for soaking or spray treatment during food preservation. Compared with similar products, potassium sorbate is more efficient, with an activity equivalent to 74% of the same weight of sorbic acid. ?

動物飼料領(lǐng)域：美國以及歐盟都認(rèn)可山梨酸鉀作為法定飼料添加劑用于動物飼料。在飼料中添加山梨酸鉀，能夠抑制霉菌生長，尤其是對抑制黃曲霉素的形成效果顯著，從而避免飼料腐敗變質(zhì)。同時(shí)，它在動物腸道中還能起到抗微生物生長的作用。而且，山梨酸鉀沒有刺激性味道，不會引起動物味蕾不適，加之其作為不飽和脂肪酸，易于被動物消化，對動物沒有不良影響。鑒于飼料在貯存、運(yùn)輸和銷售過程中容易腐敗變質(zhì)，山梨酸鉀在飼料工業(yè)中的應(yīng)用市場極為廣闊。?

In the field of animal feed, both the United States and the European Union recognize potassium sorbate as a legal feed additive for animal feed. Adding potassium sorbate to feed can inhibit the growth of fungi, especially the formation of aflatoxin, which has a significant effect on preventing feed spoilage. At the same time, it can also have an anti microbial growth effect in animal intestines. Moreover, potassium sorbate has no irritating taste and does not cause discomfort to animal taste buds. In addition, as an unsaturated fatty acid, it is easily digested by animals and has no adverse effects on them. Given that feed is prone to spoilage and deterioration during storage, transportation, and sales, the application market of potassium sorbate in the feed industry is extremely broad. ?

其他領(lǐng)域：除了食品和飼料行業(yè)，山梨酸鉀在化妝品行業(yè)也被用作防腐劑，能夠防止化妝品因微生物滋生而變質(zhì)，延長化妝品的使用壽命。此外，在一些藥品制劑中，山梨酸鉀同樣發(fā)揮著防腐作用，保障藥品在有效期內(nèi)的質(zhì)量穩(wěn)定。

Other fields: In addition to the food and feed industry, potassium sorbate is also used as a preservative in the cosmetics industry, which can prevent cosmetics from deteriorating due to microbial growth and extend their service life. In addition, in some pharmaceutical preparations, potassium sorbate also plays a preservative role, ensuring the quality stability of the drug during its expiration date.

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