3 results about "Bromocresol purple" patented technology

The utility model relates to the technical field of dairy products, and discloses a dairy product freshness indicating label which comprises an annular indicating shell arranged on a dairy product bottle opening and further comprises a connecting groove formed in an inner cavity of the annular indicating shell, and a pH sensitive gel sheet material is arranged in the connecting groove. Threaded strips are arranged in the annular indicating shell. Firstly, a transparent acrylic observation ring is integrated at the top of an annular indication shell, and is matched with a built-in pH sensitive gel sheet material, so that visual monitoring of the freshness of the dairy product is realized, and the working principle is as follows: when microorganisms metabolize to produce acid in the product storage process, the headspace COconcentration in a bottle is increased, acid gas permeates a special PTFE microporous membrane, and the pH sensitive gel sheet material is detected; when the product is in use, the product reacts with a pH sensitive gel sheet formed by compounding agarose / gelatin and bromcresol purple, a consumer can visually judge the state of the product through an observation window only by opening a sealing cover, purple represents freshness, yellowish purple indicates that the product is close to the shelf life, and yellow represents that the product is deteriorated.

The application provides a method for detecting plant growth hormone-like substances in sludge stabilization products, comprising the following steps: contacting the root system of a plant with a sludge extract solution added with CaCl2 to activate a messenger; transferring the plant treated by the activated messenger to an agar gel layer plate added with bromocresol purple indicator; observing the color development of the agar gel layer plate during the culture process; and judging the content of the plant growth hormone-like substances in the sludge extract solution according to the color development. The method for detecting plant growth hormone-like substances in sludge stabilization products provided by the application is based on the acidification degree of the root system of a plant, takes bromocresol purple as an indicator, and combines color development with a plant water culture experiment, so that simple, rapid and low-cost qualitative detection of the plant growth hormone-like substances in sludge stabilization products is realized.

This invention belongs to the field of microbial culture technology. It provides a method for culturing cariogenic acid-producing anaerobic bacteria and its application. The culture medium comprises the following components in the following proportions: peptone 0.5-5%, sucrose 1-10%, sodium chloride 0.1-0.6%, bromocresol green 0.1-0.3%, bromocresol purple 0.01-0.15%, vitamin C 0.01-0.05%, Tween-80 0.01-0.06%, phenylethanol 0.01-0.25%, and deionized water, forming a liquid culture medium. Based on the specific requirements of bacterial culture, this invention is used for culturing bacteria from teeth and the oral cavity. Peptone is used as the nitrogen source, and sucrose as the carbon source. When bacteria multiply rapidly, they convert sucrose into an acidic substance, changing the pH of the culture medium. In the presence of bromocresol green / bromocresol purple, the color of the culture medium changes, allowing for the determination of bacterial content in the sample and the prediction of the risk of dental caries.