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Effects of Dietary Lipid Levels on Metamorphosis and Survival of Mud Crab (Scylla paramamosain) from Zoeal 3 Stage to Instar 1 Crablet

Lam Tam Nguyen, Nguyen Thi Ngoc Anh, Tran Thi Thanh Hien

Date Received: 27-02-2018 / Date Accepted: 10-02-2019
A study on the effects of lipid levels in formulated feeds for mud crab (Scylla paramamosain) from zoeal 3 stage to instar crablet 1 was conducted in two rearing phases. From zoea 3 to the megalopal stage, the crabs were reared in 120 l composite tanks at salinity of 30‰ and stocking density of 50 Ind./l. From megalopal stage to crablet 1, the crabs were reared in the 50 l plastic tanks at salinity of 26‰ and stocking density of 10 Ind./l. The experiment was set up randomly with five isonitrogenous (53%) diets containing 6%, 8%, 10%, 12% and 14% lipid, and each treatment was done with five replicates. Mud crab larvae were fed experimental feeds combined with Artemianauplii during feeding trial. Results showed that the larval stage index of zoea 3 into zoea 5 stages varied in the range of 4.58-4.96 and the survival of megalopa was 5.45-7.40%, in which the 12% dietary lipid treatment attained highest values and was statistically different (P<0.05) compared to the remaining feeding treatments. Similarly, the highest survival, individual weight and carapace width of crablet 1 were obtained in the dietary lipid level of 12%. These results suggested that formulated diet containing 12% lipid could be considered as the most suitable diet for mud crab from 3 zoeal stage to instar 1 crablet.
Antioxidant Activity of Theobroma Cacao Extract In Vitro and Its Effect on Lipid Oxidation of Cobia Muscles

Nguyen Thi Huyen, Pham Thi Kim Quyen, Nguyen The Han

Date Received: 08-08-2016 / Date Accepted: 12-04-2017
Cacao tree (Theobroma cacao L.) is widely grown in the Central Highlands of Vietnam. During the harvest period, the leaves are not used for any purpose. The present study was conducted to determine the suitable extraction conditions to obtain a rich polyphenol and antioxidative extract from the cacao leaf. The dried cacao leaf extract was applied to prevent lipid peroxidation in the cobia muscles. The suibtale extraction conditions were determined as follows: the extraction solvent was 50% ethanol, the extraction temperature was 75°C, the extraction time was 90 min and the extraction method was ultrasound-assisted extraction. The extract obtained under the suitable conditions had the total polyphenol level, DPPH radical scavenging activity (EC50) and total reducing power (EC50) of 21.33 mg GAE/g dry matter, 0.05 mg/ml and 0.39 mg/ml, respectively. The dried cacao leaf extract was effective in retarding lipid oxidation of minced cobia muscles during cold storage of 9 days. Thus, the cacao leaf extract had a potential to be used as a natural antioxidant to control lipid oxidation during the cold storage of aquatic products.
Evaluation of Productivity and Meat Quality of Lac Son Ri Chickens at Different Slaughter Ages

Nguyễn Thị Nga, Vũ Quỳnh Hương, Bùi Văn Huế, Nguyễn Văn Duy, Vũ Đình Tôn

Date Received: 13-11-2025 / Date Accepted: 07-08-2026 / Date Published: 30-09-2026
This study evaluated the effects of slaughter age on carcass yield and meat quality of Lac Son Ri chickens. The study was conducted from January to September 2025. A total of 1,000 Lac Son Ri chickens were raised under free-range conditions in Chi Thien commune, Hoa Binh province, and fed a complete commercial diet. Male chickens were slaughtered at 17; 19 and 21 weeks of age, while females were slaughtered at 15; 17 and 19 weeks of age. The results showed that thigh meat weight, by-product weight, abdominal fat weight, and abdominal fat percentage increased with slaughter age, reaching the highest values at 21 weeks of age in males (P
DOI: https://doi.org/10.31817/tckhnnvn.2026.24.9.04
Using Formulated Diets for Growth-Out Trial of Bragid Catfish (Mystus nemurus) in Cages in Reservoir at Yen Thanh District, Nghe An Province

Nguyen Quang Huy, Nguyen Thi Hong Tham, Tran Minh Hieu, Nguyen Duong Duc, Phan Gia Thanh, Tong Hoai Nam

Date Received: 28-03-2012 / Date Accepted: 25-05-2012
Four isoenergic feed pellets of different protein and lipid levels, namely D1 (35% Pr, 10% L), D2 (42% Pr, 10% L), D3 (42% Pr, 5% L) and D4 (35% Pr, 5% L), were used to investigate the growth of bagrid catfish Mystus nemurus in cages breed in water reservoir in Yen Thanh, Nghe An. Experimental fish of initial size of 47.0 ± 1.2 g were fed twice a day to satiation in 85 days. Fish fed on diet D2 which contained the highest protein and lipid levels showed the best growth rate and the lowest feed conversion ratio (P <0.05). Fish fed on D4 diet with the lowest in protein and lipid content yielded the lowest growth rate and protein efficiency ratio and the highest feed conversion ratio (P <0.05). Fish fed on diet D3 gave similar growth rate, protein efficiency ratio to those fed on diet D1 but had a lower feed conversion ratio (P <0.05). Survival rates of fish from all feed treatments were high (93.0-96.0%) and no significant difference was found among treatments. Based on these results, diet D2 (42 % protein and 10 % lipid) was recomended for maximizing growth rate and feed utilization of Mystus nemurus.
The Changesin Gamma-aminobutytric Acid, Phytic Acid Content and Other Compositions in Soybean During Germination

Nguyen Duc Doan, Dinh Thi Tuoi

Date Received: 01-04-2020 / Date Accepted: 25-05-2020
The objective of this study was to evaluate the effect of germination temperature and time on gamma-aminobutyric acid (GABA), phytic acid (PA) and other compositions (protein, lipid and ash). The Vietnamese variety of soybean DT2010 was germintated at 26, 28 and 30C for 24, 36 and 48h. GABA was analysed using high performance liquid chromatography (HPLC). Phytic acid was determined by the colorimetric method. Protein, lipid and ash were analysed using Kjeldahl, extraction in n-hexan and incineration method, respectively. GABA content increased by 2.2 times in the sample germinated at 30C/36h, meanwhile protein increased by 1.15 times in the samples germinated at 28C/48h, as compared to those in the ungerminated samples. In contrast, phytic acid content decreased by 25.30% in the samples germinated at 28C/48h; lipid and ash content also decreased by 39.52% and 62.85%, respectively,in the samples germinated at 30C/48h, as compared to those in the ungerminated samples. These results would be such a benefit for producing soybean derived food products for human health.
The Effects of Germination on Gamma-aminobutyric Acid, Phytic Acid and Chemical Composition of Hyacinth bean (Lablab purpureus(L.) Sweet)

Nguyen Thi Thom, Nguyen Thi Dinh, Duong Thi Doanh, Cao Thi Thao, Nguyen Duc Doan

Date Received: 26-02-2021 / Date Accepted: 18-04-2021
The study aimed to investigate the effects of temperature and germination time on the changing of gamma-aminobutyric acid (GABA), phytic acid and the hyacinth bean’s compositions (total solid content, protein, lipid, ash content). The seeds of Hyacinth bean were germinated at 26, 28, 30 and 32C for 12, 24, 36 and 48h. GABA and phytic acid were analyzed using the colorimetric methods. Total solid, protein, lipid and ash content were analyzed using the drying method, Kjeldahl, Soxhlet and incineration, respectively. The results showed that the germination was significantly influenced by GABA, phytic acid and chemical compositions of the germinated hyacinth bean seeds. Hyacinth bean seeds were germinated at 30C for 36h showed the highest content of GABA and protein. Phytic acid and total ash content significantly decreased as prolonging germination without being affected by incubated temperature. Lipid and total solid content also decreased as increasing germination temperature and prolonging incubation time.
Thu hồi protein và lipit từ đầu cá ngừ bằng enzyme protease công nghiệp

Nguyen Thi My Huong

Date Received: 28-09-2013 / Date Accepted: 22-12-2013
Sự thu hồi protein và lipit từ đầu cá ngừ vây vàng theo phương pháp thuỷ phân bằng enzyme đã được nghiên cứu. Sự thuỷ phân đầu cá ngừ được thực hiện bằng Protamex 0,5% ở nhiệt độ 45°C, không điều chỉnh pH, trong thời gian 120 phút, tỉ lệ nước/nguyên liệu là 1/1 (ml/g). Hiệu suất thu hồi nitơ, thành phần axit amin của sản phẩm thuỷ phân protein, hiệu suất thu hổi lipit và thành phần axit béo của dầu cá thu được từ sự thuỷ phân đầu cá ngừ đã được xác định. Kết quả đã chỉ ra rằng sau 120 phút thuỷ phân, hiệu suất thu hồi nitơ và lipit lần lượt là 70,3% and 65,4%. Sản phẩm thuỷ phân protein từ đầu cá ngừ vây vàng có hàm lượng protein 80%, lipit 1,3% và tro 7,9%. Sản phẩm thuỷ phân protein có hàm lượng axit amin không thay thế cao (33,67%). Dầu cá thu được từ sự thuỷ phân đầu cá ngừ giàu axit béo omega 3 (18,99%), đặc biệt axit docosahexaenoic (DHA) và eicosapentaenoic (EPA). Hàm lượng axit béo omega 6 là 4,37%. Các axit béo có hàm lượng cao trong dầu đầu cá ngừ là palmitic (29,75%), oleic (16,76%) và docosahexaenoic (14,56%).
Hypersensitive Response in “Nam Dan” Soybean Roots to Lead

Mai Van Chung, Nguyen Duc Dien, Nguyen Dinh San

Date Received: 05-09-2014 / Date Accepted: 10-10-2014 / Date Published: 06-08-2025
The present paper reported hypersensitive response (HR) in roots of soybean cultivar “Nam Dan” exposed to Pb2+ ion with concentrations of 0.1, 0.5 and 1.0mM after 6 hours treatment. An increase in content of thiobarbituric acid reactive substances (TBARS)-products of lipid peroxidation, and the high percentage of membrane injury caused serious cellular damage in root cells. Hydrogen peroxide (H2O2) was strongly induced and soon reached high level, however, the burst of superoxide anion radical (O2.-) was not recorded. The enhancement of HR was not correlated with the treated concentrations of Pb2+ . The activity of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT) rapidly increased and maintained high level in 6-48 hours after t Pb2+ treatmen, making contribution to control the burst of H2O2 and O2.- in HR in soybean roots.
DOI: https://doi.org/10.31817/tckhnnvn.2014.12.7.
Effect of some Technological Factors on the Lipid Extraction from the Flesh of Canarium tramdenum Dai and Yakovl. Fruits Harvested in Huong Son, Ha Tinh

Lai Thi Ngoc Ha, Do Thi Hong Hai, Nguyen Thi Thom, Nguyen Thi Thanh Thu

Date Received: 07-11-2022 / Date Accepted: 27-01-2023 / Date Published: 03-07-2025
In this study, effects of some technological factors on the lipid extraction from flesh of Canarium tramdenum Dai and Yakovl. fruits were evaluated. Lipid in Canarium tramdenum flesh was obtained by dynamic extraction using organic solvents. Results showed that the best extraction conditions were determined as followings: ethyl acetate used as extraction solvent, material/solvent ratio of 1/10 (w/v) at temperature of 40°C, two times of extraction (30 minutes for the 1st extraction and 15 minutes for the 2nd one). At these conditions, the oil extraction yield was of 99.56 ± 1.70%. The crude oil had acid value of 3.10 ± 0.34mg KOH/g and peroxide value of 0.45 ± 0.09 meq O2/kg. These values were lower than the maximal legal levels given in Vietnamese standards for vegetable oils TCVN 7597:2018. Oleic acid, palmitic acid and linoleic acid were major fatty acids of the crude oil. Interestingly, oil was rich in phenolic compounds (160.91 ± 4.14mg gallic acid equivalents/kg) and had high antioxidant capacity (2.91 ± 0.06mmol Trolox equivalents/kg). This opens potential application of this fruit oil in food technology as a natural preservative against lipid oxidation.
DOI: https://doi.org/10.31817/tckhnnvn.2023.21.1.
Effect of Slaughtering Age on Nutritional Composition and SensoryQuality of Tien Yen Chicken Meat

Vu Quynh Huong, Nguyen Vinh Hoang, Nguyen Thi Nga, Nguyen Van Duy

Date Received: 09-08-2022 / Date Accepted: 27-01-2023
This study aimed to determine the nutritional, physicochemical,and organoleptic composition of Tien Yen’s caponsand layinghensatdifferent slaughtering ages. Caponswere evaluated at 6.5, 7, and 7.5 monthsof age. Hens were evaluated at 5, 5.5, and 6 months of age. The results indicated that the protein content of the meat did not change while the lipid and cholesterol content raised with the increasein chicken slaughter age. The cholesterol levelof capons at 7 and 7.5 months was 1.5 and 1.7 times higher than at 6.5 months, respectively. Similarly, the cholesterollevelof hens at 6 months of age was 1.3 times higher than at slaughter at 5 months. The physicochemical parameters of Tien Yen chicken such as toughness, color, rate of waterloss after storage and loss rate after processing did not show significant differences between slaughter ages, but earlier slaughter age had pH24 values higher than that of later slaughter age. The organoleptic quality of chicken meat was the same across the slaughter ages.Thus, slaughtertimeat 6.5 months of age for caponsand at 5 months of age for hens helps to reduce lipid and cholesterol levels in commercial Tien Yen chicken.
Identifying Lipid, Mineral, Fatty Acid Contents and Biochemical Indicators in Sesame (Sesamum indicum L.) Seeds

Tran Thi Thanh Huyen, Cao Phi Bang

Date Received: 25-07-2014 / Date Accepted: 14-10-2014 / Date Published: 06-08-2025
In this study, six sesame varieties collected from several provinces were used to determine chemical composition. The indicators of the nutritional quality of sesame seeds, such as lipid content, biochemical indicators (acid indexes, iodine numbers, and soap indexes), mineral contents and fatty acid contents were analyzed for comparison between the different sesame varieties. The results showed that three varieties, V5, V14 and V17 have high nutritional value and quality (lipid content more than 50%; acid indexes less than 3). All six varieties have high contents of minerals and unsaturated fatty acids (>70% of oleic, linoleic, linolenic).
DOI: https://doi.org/10.31817/tckhnnvn.2014.12.7.
Evaluation of Quality of Feed Ingredients used in Aquafeed Production

Nguyen Quoc Cuong, Pham Duy Hai, Le Hoang, Ly Huu Toan, Vo Thi My My, Le Tran Hoai Khanh, Nguyen Van Nguyen

Date Received: 08-10-2025 / Date Accepted: 02-07-2026 / Date Published: 27-08-2026
This study aimed to evaluate the quality of feed ingredients, focusing on chemical composition and safety limits. In this study, 67 samples of various feed ingredients from different feed mills and local brokers were collected to evaluate the quality. Biochemical and microbiological parameters were analyzed according to Vietnam National Standard methods, while amino acids and fatty acids were analyzed by High Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC), respectively. The results showed that fishmeal was a rich source of protein. Peruvian and Chilean fish meals contained higher than 65% protein, whereas local fish meals contained less than 62%. Tra catfish byproduct meal comprised 56-62% protein and 8-10% lipid. Meat and bone meal exhibited high protein content (46 to 51%) and ash content (30 to 37%), but an imbalanced amino acid composition in comparison to fishmeal.The protein content of soybean meal ranged from 45% to 46%, while the lipid content was low (<3.5%). Marine fish oil contained essential fatty acids, including highly unsaturated fatty acids (HUFA), while soybean oil provides valuable fatty acids, such as linolenic acid and alpha-linolenic acid. Starch sources, including rice bran, cassava, and wheat flour, were characterized by high carbohydrate content (45-86%). Furthermore, the results for ingredient safety limits showed that neither mycotoxins nor heavy metals exceeded their permissible limits.
DOI: https://doi.org/10.31817/tckhnnvn.2026.24.8.04
Determination of Digestiblity and Incorporation Level of Rice Bran inCommon Carp (Cyprinus carpio) Ciet

Tran Thi Nang Thu, Nguyen Thi Hong Thu

Date Received: 16-11-2012 / Date Accepted: 06-01-2013 / Date Published: 13-06-2025
Possibility of using rice bran as raw material for common carp feed was evaluated throughthe digestibility value and its incorporation level in diet. The apparent digestibility coefficients (ADC) of rice bran was measured by indirect method using chromic oxide Cr2O3 as inert marker, feces were collected by sedimentation. The chemical composition of rice bran was 8.41% protein and 13.51% lipid. The digestibility of dry matter, protein and lipid of rice bran were high, reachingvaluesof97.86%, 87.45% and80.21%, respectively. Digestibilityof mineralsinrice branfor commoncarpvery high, reaching87.16%. Comparedwiththeprevious studiesonthedigestibilityoftherawmaterialsforcarp, rice branhasa relatively highdigestibilitywhich can beexplainedbythe different digestibility measure method. Evaluationthe effects ofdifferentricebranincorporation level ongrowth performance was carried out on common carp of size50g/fishwith3diets which weresupplemented35%, 40% and45% of rice bran. The growth performanceoffish fed 35% rice bran diet was significantly better than that of fish fed 40% and 45% rice bran diets. There was no significant difference between growth performace of fish used40% and45% rice bran diets. Rice bran can be incorporated in common carp diet at the suitable level of 35%. Thedaily growth weight gain was 2.23 g/fish/day and feed conversion ratio was 1.87 for common carp fed diet contenning 35% rice bran.
DOI: https://doi.org/10.31817/tckhnnvn.2013.11.1.
Influence of Ecological Sub-Region on Productivity and Quality of Brown Rice of Some Rice Varieties in The Northwest Region

Nguyen Hoang Phuong, Nguyen Thi Thu Hien, Nguyen Thi Quyen, Nguyen Duc Thuan, Nguyen Thi Ngoc Ha, Nguyen Van Khoa, Pham Van Cuong

Date Received: 07-02-2025 / Date Published: 21-02-2025
This study was conducted to assess the influence of different ecological sub-regions on the yield and quality of brown rice from local glutinous rice varieties and newly released Japonica rice varieties. The field experiments was conducted in during 2021 spring and autumn cropping seasons Moc Chau - Son La and Muong Thanh - Dien Bien. The findings revealed that local glutinous rice varieties had greater capacity for dry matter accumulation compared to the new Japonica varieties across all ecological regions. However, the yield of new Japonica variety, Ja35 (6.92-7.35 tons/ha), was significantly higher than that of local indigenous rice varieties (5.55-6.43 tons/ha). The different ecological subregions exterted significant impact on the lipid content in brown rice, but did not notably affect the protein content in brown rice of all rice varieties in all cropping seasons. It was observed that the lipid content in brown rice and rice bran in Dien Bien was higher than that in Son La. In contrast, the oryzanol content in brown rice in Son La was higher than that in Dien Bien for all rice varieties and seasons. The new rice varieties exhibited a higher oryzanol content compared to the indigenous varieties by 0.2-0.3%.
DOI: https://doi.org/10.1234/cvqean60
Health-Benificial Properties of Milk Fat Globule Membrane Components

Le Trung Thien, Bui Van Mien

Date Received: 25-05-2012 / Date Accepted: 15-08-2012 / Date Published: 13-06-2025
In milk, lipids occur in the form of globules with diameters varying from 0.1 to 15 μm. These fat globules have a surrounding thin film which is called the milk fat globule membrane (MFGM). Fat in the core of the globules is mainly composed of neutral triacylglycerides while the lipid moiety of the MFGM fraction mainly consists of polar lipids. The protein moiety of the MFGM also has a specific composition with mainly glycosylated proteins, which are greatly different from those in milk plasma. Milk contains as little as 2 g/L of MFGM material. However, this material received much attention in recent years due to both its health-beneficial properties and technological functionalities. This paper compiles up-to-date knowledge concerning the health-beneficial effects from consumption of MFGM components. In addition, basic knowledge about composition and structure of MFGM is also briefly discussed.
DOI: https://doi.org/10.31817/tckhnnvn.2012.10.5.
Effects of Dietary Canthaxanthin on Growth and Skin Color of Permit (Trachinotus falcatus)

Nguyen Quang Huy, Do Van Thin

Date Received: 21-08-2018 / Date Accepted: 08-11-2018
This study was conducted to evaluate the effects of dietary canthaxanthin on growth and skin color of permit (Trachinotus falcatus) cultured in sea cages. Four formulated diets with the same nutritional composition (45% protein and 15% lipid) were supplemented with canthaxanthin at 0 mg/kg, 40 mg/kg, 80 mg/kg and 120 mg/kg. Yellow color on the body and fins of the fish was evaluated by colorimetry using Yolk Color Fan. The growth, feed conversion ratio and survival of the fish were not significantly different (P >0,05) after 30 days of culture. However, the yellow color on the body and fins was markedly different among treatments. Fish fed diet supplemented with with 120 mg canthaxanthin/kg had higher yellow scores than those fed control diet (0 mg/kg) and 40 mg/kg diet (P <0,05). There was no difference in color score between treatments supplemented with 0, 40 and 80 mg canthaxanthin/kg. The results showed that supplementation of 120 mg canthaxanthin/kg diet effectively enhanced skin color of permit.
Effect of Fermentation Time of Tofu Whey on Quality of Tofu

Nguyen Quang Duc, Tran Thi Thu Hang

Date Received: 11-09-2018 / Date Accepted: 27-03-2019
In traditional tofu (soybean curd) production, fermented tofu whey (acidic whey) - the watery part of soymilk remaining after the formation of tofu curd which is then naturally fermented -isutilized as protein coagulant. The aim ofthis studywas to investigate the changes of severalmajor chemical and microbiological components of the tofu whey during natural fermentation as well as the effect of fermentation time of tofu whey on the quality of tofu. The sugar and soluble protein content decreaseddue tomicroorganisms’ consumption as substrates. The increase of acid concentration was attributed tothe development of lactic acid bacteria. The whey after different fermentation times used as coagulants gavetofu with variablequality. Tofucoagulated with the whey after 24 h fermentation hadhigh protein and lipid content (14.8% and 5.2%, respectively)andgood water holding capacity(5 g water / g protein), and attainedhighest sensory evaluation scores (17.7). In addition,the whey after 24 h of fermentation used to coagulate tofu brought the highest yield(159%).
DeterminingTechnological Parameters for Cooking and Drying ofSilky Fowl(Gallus domesticus brisson)Meat

Nguyen Thi Hoang Lan, Ngo Xuan Dung, Nguyen Ngoc Cuong

Date Received: 07-09-2015 / Date Accepted: 05-05-2016
The study was carried to determine optimal parameters forsilky fowl meat powder processing thatensurefood safety and hygiene.The silky fowlsat 4 weeks of agehaving22.88% protein, 2.19% lipid and 18.2mg/100g iron werechosen for meat powder processing. The silky fowl meat steamed at 1000C for 20 minutesand then dried at 60oCfor 24 hours gave the optimal nutritional and sensory quality. The protein content of the powder was 50.71%and, especially,the iron content was significantly high (40.30mg/100g)..
Lead-Induced Oxidative Stress and Defense Responseof Soybean ‘DT84’

Mai Van Chung, Tran Ngoc Toan

Date Received: 14-01-2015 / Date Accepted: 22-07-2015
Oxidative stress in root of soybean [(Glycine max (L.) Merr.] cv. DT84’ was induced by exposure to Pb2+ ion. The reactive oxygen species (ROS) products such as hydrogen peroxide (H2O2), superoxide anion radical (O2.-) were rapidly produced 6-12 hours after treatment with Pb2+. The enhancement of the ROS was closely dependent upon concentrations of Pb2+. An increase in content of thiobarbituric acid reactive substances (TBARS) - product of membrane lipid peroxidation, and the high percentage of injury (13.89-25.03%) indicated that the cellular damage was resulted from oxidative stress. The induction of superoxide dismutase (SOD) and catalase (CAT) in roots of soybean cv. DT84 as the defense response of soybean via these antioxidative enzymes reduced the concentration H2O2 and O2.- 24 hours following Pb2+ treatment, therefore, contributing to control oxidative stress in soybean roots.
Effects of Nitrogen FertilizerLevels on Content and Quality of Rice Bran Oil in JaponicaRice Line with Thick Aleurone Layer

Nguyen Hoang Phuong, Nguyen Thi Thu Hien, Nguyen Thi Quyen, Nguyen Duc Thuan, Nguyen Van Khoa, Pham Van Cuong

Date Received: 19-05-2023 / Date Accepted: 29-06-2023
A pot experiment was carried out in net house to evaluate the effect of nitrogen fertilization levels (0.5; 1.0 and 1.5g N per 0.03m2pot) on photosynthesis, grain yield and bran oil of the promising line with thick aleurone layer (Ja12) and the check variety (the original Mizuhochikara) in both autumn and spring season. The photosynthetic rate was measured in 5 plants of each treatment at flowering, milkand dough stages while whole plant dry matter accumulation was measured in five plants at effective tillering, booting, dough and mature stages. At the harvesting stage, the grain yield, ratio of bran/brown rice, and oil content were analysed in 20 plants of each treatment.The experiment results showed that photosynthesis rate and dry matter accumulation increased in both rice varieties with increasing N fertilizer level. The grain yield and characteristics related to oil quality including lipid content and γ-oryzanol content ofJa12 were higher than those ofthe check variety at all fertilizer levels in both cropping seasons. Increasing the amount of nitrogen fertilizer did not increase the ratio of bran/brown rice but increased the content of bran oil and the γ-oryzanol content in both rice varieties, especially the increase was much higher in Ja12 than that in Mizuchihokara variety in both cropping seasons.
Effect of Additional Materials and Additives on Quality of Soy Yogurt Fortified with DragonFruitJam

Tran Thi Dinh, Nguyen Thi Quyen, Nguyen Thi Thuy Nga, Vu Thi Huyen, Than Thi Huong, Nguyen Thi Hoang Lan, Daylan A Tzompa-Sosa, Koen Dewettinck

Date Received: 28-07-2023 / Date Accepted: 12-04-2024 / Date Published: 12-06-2025
The study aimed to investigate the effect of ingredients and foodadditives on the quality of soy yogurt. The quality attributes of soy yogurt with dragon fruit jam addition were determined using instrumental analysis. The sensory properties of the product were evaluated using the ranking method. The results showed that soy yogurt supplemented with 1.5% whey protein, 0.5%skimmed milk, 0.5% whipping cream, and stabilizers of 0.8% gelatin and 0.2% modified starch resulted in the soy yogurtwith protein content equivalent to animal-basedyogurt with 3.6% protein, 1.3% lipid, 12.0% carbohydrate, stable product texture,and highly acceptable sensoryquality.
DOI: https://doi.org/10.31817/tckhnnvn.2024.22.4.
Characterization and Selection of Self-Pollinated and Geitonogamy-Derived Avocado Trees with High Fruit Quality in Tien Giang Province

Nguyen Thi Mai Hanh, Le Huu Hai, Thai Hoang Phuc

Date Received: 08-07-2022 / Date Accepted: 04-08-2023
This research was conducted to identify avocado trees with high quality of fruit as a source ofbreeding new avocado species. The survey was performed on individual avocado tree which had capable of fruiting in Tien Giang. The selected avocado trees recorded flowering characteristics., ratio of flowers on the tree, described fruit characteristics., and analyzed fruit quality criteria. In this study, four individual avocado trees were selected, displaying a capable of self-pollination and cross-pollination with flowers on the same tree, denoted as Cai Lay 1, Cai Lay 2, Cai Lay 3 and Cho Gao. They were well adapted to the conditions in Tien Giang province, yielding 70-120kg of fruit per tree every year. On average, the percentage of self-pollinated flowers accounted for about 33.31%, the group of semi-pollinated flowers accounted for about 11.25% and group A/group B flowers (which could not pollinate) accounted for about 51.45%. Those trees possessed fruit pulp moisture (ranged from 72.6-79.9%), fruit hardness (ranged from 1.03-1.37N) and high brix elevation (ranged from 10.0-12.0%). Out of them, Cai Lay 1 avocado indicated a higher lipid content (20.5%) and protein content (3.08%) than the Booth avocado varieties of class I, avocado 034 grown in Da Lat and avocado 034 grown in Tien Giang.
Selecting Strains and Experimental Cultivation of Hymenopellis Radicata(Rooting Shank) on Common Local Source of Substrate in Da Nang City

Tran Thi Thu Thuy, Vo Tran Khanh Huyen, Vu Thuy Duong, Pham Chau Huynh

Date Received: 03-10-2023 / Date Accepted: 25-12-2023
Rooting shank or black root mushroom, Hymenopellis radicata(Xerula radicata, Oudemansiella radicata),is a wild edible mushroom known for its high nutritional and medicinal value and, thus, significant potential for the food and pharmaceutical industries. The objective of this study was to select Hymenopellis radicatafrom five different sources and compared under controlled growing conditions in Da Nang city, Vietnam. The substrates consisted of 80.0 w% rubber tree sawdust, 10.0 w% rice bran, 9.0 w% cornmeal, and 1.0 w% CaCO3, with 30 bags per experiment, replicated three times. The mushrooms were evaluated for their growth, biological efficiency, and fruiting body quality. Data analysis identified a superior genetic source (designated as M2), which was recommended for cultivation in Da Nang city. Mycelial growth rate on the substrate was 6.26±0,24mm/day, biological efficiency of 12.06±0.38%, total protein content in the fruiting body of 31.2 w% dry weight, lipid content of <1.0 w% dry weight, and absence of E.coliand Salmonella. Notably, Hymenopellis radicataexhibited a high cadmium uptake capacity (~3.7 mg/kg dry weight), surpassing the permissible limit of 0.2 mg/kg according to QCVN 8-2:2011/BYT, while showing no affinity for lead.
Co-culture of Tilapia (Oreochromis niloticus) andRed Seaweed (Gracilaria sp.) with Different Feeding Regimes

Nguyen Thi Ngoc Anh, Nguyen Phat Dat, Tran Ngoc Hai

Date Received: 09-02-2017 / Date Accepted: 11-02-2017 / Date Published: 12-06-2025
The study on co-culture of tilapia (Oreochromis niloticus) and red seaweed (Gracilariasp.) with different feeding rates was conducted consisting of 4 treatments with 3 replicates. Fish was mono-cultured and fed at libitumas a control.In other three treatments, fishwere co-cultured with red seaweed and fed at 75%, 50%and 25% feed ration of the control. The experimental fish with mean weight of 4.65-4.69g were stocked at density of 250fish/m3 and at salinity of 10ppt. After 56 days of culture, the survival of fish was not affected by the feeding regimes, ranging from 95% to 100%.The growth rates of fish fed 75% satiation were not significantlydifferent(p>0.05) compared to those inthe control. Proximate composition of fish fillet (moisture, protein and ash) was similar among treatments while lipid level in the control was significantly higher than the 50% and 25% satiation feeding regimes.These results indicated that tilapia- red seaweed co-culture with feeding75% feed rationof the controlstill sustained normal growth performance of tilapia and reducedthe feed cost as well as maintained better water quality.
DOI: https://doi.org/10.31817/tckhnnvn.2017.15.11.
Potential of Metan (CH4) Digested from Organic Waste Sources in Vietnam

Bui Ngoc Tan, Dinh Mai Thuy Linh, Kazuya Matsunaga, Pham Van Cuong

Date Received: 18-04-2026 / Date Accepted: 05-09-2026 / Date Published: 30-09-2026
This study evaluated the physicochemical properties and methane production potential (BMP) of four organic by-products: feed waste, pig manure, chicken manure, and plant waste, through batch anaerobic fermentation over 42 days. The experiment was conducted using a laboratory BMP system. Performance indicators were calculated based on chemical oxygen demand (COD) and electrothermal production efficiency. The results showed that feed waste was the optimal feedstock with the highest accumulated CH4 yield (21,482NmL) and BMP (638,5ml CH4/g VS). Plant waste had a BMP of 513,5NmL CH4/g VS but a low COD conversion rate (7.01%) (half that of feed waste) due to its higher carbon content. Chicken manure had the highest solids content, while BMP was achieved at 346NmL CH4/g VS. Pig manure had the lowest BMP index, but its CH4 gas quality was superior, reaching 72.16% due to its high lipid content. The efficiency of electricity and heat production of the materials decreases gradually from food waste > chicken manure > plant waste > pig manure. The study confirms that the potential and quality of methane gas depend closely on the input materials, which form the basis for using these materials for biogas production and electricity generation in Vietnam.
DOI: https://doi.org/10.31817/tckhnnvn.2026.24.9.02

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