Lactobacillus acidophilus (a bacterium for short) belongs to the genus Lactobacillus in the family lactobacilli. It is a Gram-positive bacterium with slender rod shape, no flagella, no movement, anaerobic or facultative anaerobic; It can use glucose, fructose, lactose and sucrose for homotype fermentation to produce DL lactic acid. Pg-las107 is the enterprise number

Product No.: pg-las107

Product classification functional probiotic powder

I. Basic Information

Lactobacillus acidophilus (a bacterium for short) belongs to the genus Lactobacillus in the family lactobacilli. It is a Gram-positive bacterium with slender rod shape, no flagella, no movement, anaerobic or facultative anaerobic; It can use glucose, fructose, lactose and sucrose for homotype fermentation to produce DL lactic acid.

II. Size and colony morphology

1. Size under electron microscope, the cell size is generally 0.6 ~ 0.9 × 1.5～6.0 μ m. They are arranged in single, double or 2-3 short chains. The bacteria are usually slender rod-shaped, without flagella and do not move, as shown in the figure:

2. Colony morphology on MRS medium, the colony formed is small, with smooth edges, convex and smooth surface, flashing oily light, opaque and no pigment.

III. suitable for growth environment

1. The optimum growth temperature is 35 ℃ ~ 38 ℃, no growth below 20 ℃, the maximum growth temperature is 43 ℃ ~ 48 ℃, and the heat resistance is poor; The optimum pH is 5.5 ~ 6.0, and the initial pH is 5.0 ~ 7.0. It has strong acid resistance and can grow and reproduce in an environment where other lactic acid bacteria cannot grow. Lactobacillus acidophilus has particularly strong acid and bile salt resistance. When the bile salt concentration is 0.3% and the pH value is 2.0, the survival rate reaches 62.2%; Lactobacillus acidophilus has obvious osmotic pressure resistance, and its maximum tolerable concentration of NaCI is 9%; Lactobacillus acidophilus had obvious inhibitory effect on Staphylococcus aureus and Escherichia coli, and the diameter of its inhibition circle was 15mm and 14mm respectively; Lactobacillus acidophilus has certain tolerance to gentamicin, aminophyllin and chloramphenicol, but the degree of tolerance is different.

2. The growth and reproduction of Lactobacillus acidophilus needs certain growth factors such as vitamins. It grows slowly and has a long production cycle under the most suitable growth temperature; The low rate of acid production in milk is mainly due to its incomplete proteolytic enzyme system, redox potential and trace elements. Adding substances that reduce redox potential (such as ascorbic acid, cysteine, etc.) and growth promoting substances, such as liver extract, carrot extract, lactose, lactose hydrolysate and casein hydrolysate, can promote the growth of Lactobacillus acidophilus.

IV. growth characteristics

1. Culture characteristics: it can be cultured in the laboratory with MRS medium;

2 biochemical characteristics: the growth and reproduction of Lactobacillus acidophilus needs certain growth factors such as vitamins and folic acid. It grows slowly and has a long production cycle under the most suitable growth temperature; The weak proteolytic power and low acid production rate in milk are mainly due to its incomplete proteolytic enzyme system, redox potential and trace elements. Adding substances that reduce redox potential and growth promoting substances to milk can promote the growth of Lactobacillus acidophilus.

5： Product information:

[executive standard] Q / pgjk0001s

[food production license No.] sc10637082900938

[shelf life] the shelf life is 24 months

[storage and transportation] the product is stored at - 18 ℃ or lower, and needs to be sealed and protected from light. The shelf life is 24 months.

[packaging] the products are packaged in high barrier composite aluminum foil bags, with packaging specifications of 1kg / package, 5kg / package, or according to customer needs.