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• Assessment and Prediction of Productivity of wild macrofungal species in the Central Highlands of Vietnam

  Dang Thi Thu Huong, Nguyen Van Sinh, Nguyen Hung Manh, Bui Thi Tuyet Xuan, Nguyen Tien Dung

  Date Received: 18-08-2023 / Date Accepted: 25-12-2023

   Abstract PDF (VIETNAMESE)

  The assessment of productivity of some important wild macrofungi helps us to predict the mushroom supply in different natural conditions and make recommendations on development of empirical models for achieving highest productivity. This study aimed to evaluate productivity of seven important macrofungi in the forest from 90 plots in 03 National Parks belongings to the Central Hiaghlands for nearly 3 years (from 2021 to 2023). The macrofungi included 6 edible species: Boletus edulisBull., Agaricus bisporus(J.E.Lange Imbach), Ramaria botrytoides(Pk.) Comb., Amanita caesarea(Scop.) Pers., Termitomyces eurrhizus(Berk.) R. Heim. and Auricularia nigricans(Sw.) Birkebak, Looney & Sánchez- García and 01 medicinal species: Ganoderma lucidum(Curtis) P. Karst. to build the predicted models for them. The method of collecting and determining the fresh weight of edible mushrooms in the field was carried out weekly from May to November every year. The average yield of Ganoderma lucidumwas the highest at 19.22 ± 2.95 kg-1ha-1year and the lowest of Ramaria botrytoides: 2.42 ± 0.54 kg-1ha-1year. Using the quadratic polynomial function to build predicting models, 07 prediction models were built for each mushroom species and 04 predicting models for each National Park and in the Central Highlands with sufficient reliability as shown by high determination coefficient (R2 = 0.7518-0.9909).

• Modelling for Growth of Mould

  Dao Thien, Tran Thanh Hoa, Nguyen Thi Bich Thuy, Tran Thi Lan Huong

  Date Received: 29-05-2012 / Date Accepted: 12-08-2012

   Abstract PDF (VIETNAMESE)

  Predictive mycology aims at predicting fungal development in foods and raw products. For many years, most of the studies concerned food pathogenic bacteria. Recently, there is a growing concern about food contamination by moulds, especially strains responsible for mycotoxins production. This paper advocates the use of specific models for describing germination and growth of mould.

• Sorption Isotherm Curve of Freeze Dried Salmon Product

  Nguyen Xuan Duy, Nguyen Anh Tuan

  Date Received: 28-11-2012 / Date Accepted: 03-01-2013

   Abstract PDF (VIETNAMESE)

  Sorption isotherm curve of freeze dried (FD) product was investigated at 20oC, 30oC, and 40oC. Experimental data obtained were verified by eight mathematical models including BET, Bradley, GAB, Halsey, Henderson, Kühn, Mizrahi, and Oswin. Eight models agreed well with experimental data (R2= 0.9374-1,0000) when water activity (Aw) varied from 0.12 to 0.43. However, when Aw is extended ranging from 0.12 to 0.93, only four models named as GAB, Kühn, Halsey and Oswin still show a good agreement with the experimental data. These models can be used in predicting water absorption of FD salmon product at 20oC, 30oC, and 40oC withacorrelation coefficient (R2) ranged from 0.9776-0.9917, 0.9867-0.9991, 0.9821-0.9920 and 0.9464-0.9995, respectively. Errors between experimental and calculated data from the four models were 5.1%, 4.9%, 8.7% and 9.4%, respectively. Water monolayer value is determined at approximately 5%.