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• Characterization of BacillusStrains Isolated from Rice Vermicelli Phu Do Village Wastewater

  Nguyen Thi Lam Doan, Le Thi Quynh Chi

  Date Received: 29-01-2021 / Date Accepted: 07-04-2021

   Abstract PDF (VIETNAMESE)

  The Bacillusspecies have become an increasingly important group of microorganisms with many applications such as environmental pollution treatment, traditional fermented products, pharmacy, etc. This study collected 66 strains of Bacillusfrom the wastewater samples of rice vermicelli production families at Phu Do to build up a collection of strains of this genus. The activities of extracellular enzymes of 66 isolates were investigated. The results showed that 26/66 strains secreted all three extracellular enzymes as protease, amylase, and cellulase with the largest substrate resolution ring diameters of 18.3, 20.8 and 20.9mm, respectively. Among them, four different strains NTB2.1, NTB2.3, NTB2.11, NTB5.7 were more active in biofilm formation than others based on the crystalline purple dye method. The data from measurement of absorbability at 570nm (OD570) wavelength showed greater than or equal to 3.17. In addition, these strains inhibit the growth of pathogenic microorganisms such as E. coli, Salmolellaand these strains were not antagonized to each other.

• RESEARCH ON THE CHANGE OF 2-AP AND OTHER VOLATILE COMPOUNDSIN PROCESSING BUN FROM RICE

  Phan Phuoc Hien, JD Park, Truong Thi Bich Lieu

  Date Received: 29-05-2012 / Date Accepted: 15-09-2012 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Vermicelli is the traditional dish of Vietnam which is the main material to prepare “Hue Beef rice vermicelli” (Bun bo Hue), a very famous specialty originated from Huecity, the former imperial capital of Vietnam. Flavor and taste are important attributes of vermicelli. This study was carried out to determine the change in 2-AP and other volatile compounds as influenced by different durations of soaking rice in water during vermicelli processing. In order to identify and quantify the amount of 2-AP and other volatile compounds 2-AP extracted from pandan leaves was used as standard. Results indicated that 2-AP and other volatile compounds clearly changed in the vermicelli processing process and soaking for 12 hours was recommended.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.5.