Objective:To investigate the influencing factors in acidity test in the quality standard of lactasin. Methods:The acid-ity was tested under the conditions of milk from different sources, various inoculation amount and preservation conditions. Results:The acidity was not stable under the conditions of milk with different brands and batches. The current quality standard could not truly reflect the influence of preservation conditions on the sample quality. Conclusion:The unreliable acidity test results are caused by the quality problem of milk culture media and the current unreasonable standard method.

Objective:To investigate the microbial contamination status of Chinese herbal pieces from Guangxi regions and provide reference for the microbial limit standard. Methods:According to Chinese Pharmacopoeia (2015 edition), the herbal pieces were analyzed for the total number of aerobe microbial, yeasts, molds, thermophilic bacteria and bile-resistant gram-negative bacteria,and salmonella was also detected. Results:In 90 batches of Chinese herbal pieces,the lg average value of the total number of aerobe microbial was 3.7,and that of the total yeasts and molds was 1.7,that of thermophilic bacteria was 0.9 and that of bile-resistant gram-negative bacteria was 1.1,and Salmonella was not detected out. There were statistically significant differences (P < 0.05) in the microbial contamination levels of herbal pieces with different processing techniques and packaging materials. Conclusion:According to different processing methods and administration, microbial limit standard should be established for classification in order to guide the standardized production of Chinese herbal pieces and improve their quality gradually.

OBJECTIVE:To analyze the results of national evaluation inspection for 83 batches of Compound jiegeng mahuangjian syrup(Ⅱ)from 4 manufacturers,and to evaluate their quality. METHODS:Legal inspection method and exploratory research were adopted to test,analyze and evaluate sample statistically. The contents of exploratory research included HPLC method was used to determine the contents of preservative benzoic acid and ephedrine hydrochloride;antibacterial efficacy examination of formulation was studied;pH value of solution was determined;the content of sucrose was determined by polarimetry photometry;the relationship of the content of ammonium chloride with microbial contamination was studied;headspace GC method was used to determine the contents of menthol and ethanol;Platycodon grandiflorum extractum was identified and studied by TLC. RESULTS:Results of legal inspection showed that among 83 batches of sample,80 batches were qualified and 3 batches were unqualified,with qualified rate of 96.4%. Unqualified items were loading capacity,microbial limit and content ofammonium chloride,content of ammonium chloride. The results of legal test combined with exploratory research showed thatantibacterial efficacy of formulation of one manufacturer was not in accordance with the regulations;Some raw materials were notfed according to formulation, and the quality of products was not even. It is recommended to revise the quality standard:identificatied the Campanulaceae by TLC; determination the pH, preservative content, menthol content; revision ephedrinehydrochloride assay method to HPLC. CONCLUSIONS:The overall quality of Compound jiegeng mahuangjian syrup(Ⅱ)is notsatisfactory;there is a big flaw in the production process and quality control of some manufacturers;quality standards needed to beimproved.

Adulteration in meat products is a widespread issue that could lead to serious threats to public health and religious violations. Technology that offers rapid, sensitive, accurate and reliable detection of meat species is the key to an effectual monitoring and control against meat adulteration. In recent years, high-throughput sequencing-based DNA metabarcoding technology has developed rapidly. With the characteristics of being high-throughput, highly precise and high-speed, this technology can simultaneously identify multiple species in complex samples, thus offering pronounced advantages in the surveillance of adulteration in meat and meat products. Starting with an introduction of the major developments in the high-throughput sequencing technology in the past two decades, this review provides an overview of the technical characteristics and research methods of DNA metabarcoding, summarizes the application of DNA metabarcoding technology in meat adulteration detection over the last few years, discusses the challenges of using DNA metabarcoding technology in the detection of meat adulteration, and provides future prospects on the development of this technology.
DNA ; Food Contamination/analysis* ; High-Throughput Nucleotide Sequencing/methods* ; Meat/analysis* ; Meat Products ; Technology