国产AV中文字幕,夜色网,久久99嫩草熟妇人妻蜜臀,久久久久国产综合AV天堂

新聞中心您現(xiàn)在的位置:首頁(yè) > 新聞中心 > 新品發(fā)布——改良Letheen瓊脂基礎(chǔ)(顆粒)

新品發(fā)布——改良Letheen瓊脂基礎(chǔ)(顆粒)

更新時(shí)間:2024-11-01   點(diǎn)擊次數(shù):114次

近期我司新推出HBKP8603-3-250改良Letheen瓊脂基礎(chǔ)(顆粒


Modified Letheen Agar Base is used for the determination of bacterial activity of quaternary ammonium compounds.

Approximate Formula:


Ingredients
gm/liter
Peptone from Meat
10.0
Peptone from Casein
10.0
Meat Extract
3.0
Yeast Extract
2.0
Sodium Chlorid
5.0
D(+) Glucose
1.0
Lecithin
1.0
Sodium Bisulfite
0.1
Agar
20.0
Final pH7.2±0.2 at 25℃

*Adjusted and/or supplemented as required to meet performance criteria.


Directions: 

Suspend 52.1g of the medium and 7 ml of Tween-80 in one liter of distilled water or deionized water. Mix well. Heat and boil for 1 minute with frequent agitation to completely dissolve the powder. Sterilize in an autoclave at 121℃(15 lbs.) for 15 minutes. Pour into petri dishes.

Principle and Interpretation: 

Peptone, meat extract and yeast extract provide nitrogen source for the growth of microorganisms, vitamin and growth factor. Sodium chloride provides a suitable osmotic environment. Glucose is a fermentable sugar. Lecithin can neutralize quaternary ammonium salt, Tween-80 can neutralize phenol, hexachlorophenol, formalin, the combination of which can neutralize ethanol. Sodium bisulfite partially neutralize the preservative systems commonly found in cosmetics. Agar is the solidifying agent of the medium.

Appearance:

Dehydrated medium is a free-flowing yellowish granule. The prepared medium is a kind of yellowish transparent gel.

Precautions: 

This medium is for laboratory use only. Dried medium which is past shelf life, caking or color variation cannot be used.

Storage conditions and Shelf life:

Modified Letheen Agar Base must be stored tightly capped in the original container at 5-30°C. The dehydrated medium has a shelf life of 3 years from date of manufacturing. Prepared medium may be stored, out of direct light at 2-8°C.

Quality control: 

Prepare the culture medium as per label directions. Inoculate and incubate at 36±1℃ for 24 hours.


Microorganism
Strains Number
Inoculum (CFU)
Growth
Recovery
Staphylococcus aureus
ATCC 6538
10-100
Luxuriant
≥70%
Pseudomonas aeruginosa
ATCC 9027
10-100
Luxuriant
≥70%
Escherichia coli
ATCC 25922
10-100
Luxuriant
≥70%
Salmonella typhimurium
ATCC 14028
10-100
Luxuriant
≥70%

References:
1. FDA Bacteriological Analytical Manual (BAM), 8th ed. (1995), chapter 23:Microbiological Methods for Cosmetics, Letheen Agar (modified) = M 78,etheen Broth (modified) = M 79.



青島高科技工業(yè)園海博生物有限公司

青島高科技工業(yè)園海博生物有限公司

地址:青島市高新區(qū)錦匯路1號(hào)A2棟

© 2025 版權(quán)所有:青島高科技工業(yè)園海博生物有限公司  備案號(hào):  總訪問(wèn)量:132317  站點(diǎn)地圖  技術(shù)支持:化工儀器網(wǎng)  管理登陸

欧美a级肉欲大片xxx| 亚洲V日韩V精品v无码专区小说| www.欧美一区| 无码人妻精品一区二区三区久久| 日韩有码一区| 国产免费小黄片| 色偷偷噜噜噜亚洲男人| 欧美日韩一区亚洲| A∨亚洲天堂| 欧美亚洲区成人免费电影| 男吃奶玩乳尖高潮视频午夜 | 亚洲天堂精品久久| 欧美另类日韩无| 99久久国产综合精品五月天| 欧美日韩风情| 亚洲午夜精品一区二区| 欧美美女后入网站| 黄色综合网站| javaparse人妻xxxx| www.五月| 国产在线小视频| 亚洲日韩中文字幕在线播放| 一区二区三区在线观看视频| 国产调教| h视频在线观看| 色图片一区二区| 青青草国产精品| 日韩欧美一| 丝袜 亚洲 日韩| 嫩草嫩草嫩草影院| 人妻中文字幕在线播放| 综合色区| 国产一区99| 欧洲123AV| 欧美人妖一234区| 久久天堂爱| 黄片无限看欧美| 看国产特级黄片视频| 亚洲精品视频久久| 国产三级网站| 无码av免费一区二区三区|