Water quality improvement of Penaeus monodon culture pond for higher productivity through biomediation

Intensive culturing of Penaeus monodon generates considerable amount of wastes leading to the deterioration of water quality, disease outbreaks and lower yields. Recently, the application of biocontrol agents were started in ponds in order to improve yield through bioremediation. Analytical investigation of a biocontrol product (PROFS), an extensively used product of Biostadt India Ltd. was performed to determine its accuracy and applicability. It was found that four different types of Bacillus species (69×10 9 cfu/g) were present in the product. Amylase, phytase and protease activities in the product were 3.078, 4.584 and 84.154 U/g, respectively. The biocontrol treatment was applied in the ponds five times during the cultivation (120 days) of P. monodon at a dose of 1 kg/ha. The amount of total ammonia, nitrate and nitrite of the treated ponds varied from 0.418 ± 0.039 to 0.079 ± 0.028 ppm, 0.029 ± 0.008 to 0.014 ± 0.004 ppm and 0.0127 ± 0.0008 to 0.0098 ± 0.00007 ppm, respectively, which were significantly lower than the values measured for untreated ponds. The product showed antimicrobial activity against Vibrio harveyi MTCC 7954 (inhibition zone: 4.89 mm) and Vibrio vulnificus MTCC 1145 (6.41 mm). Average body weight of shrimps in treated ponds was 33 ± 2.42 g, which was 39.5% higher than the values measured from control ponds. The Vibrio count was negligible (0.12×10 5 cfu/ml) and the survival rate was 93% in treated ponds

Statistical optimalization of α-Amylase production from Penicillium notatum NCIM 923 and kinetics study of the purified enzyme

In this study, response surface methodology (RSM) was employed to optimize the production of α-amylase by Penicillium notatum NCIM 923 through solid-state fermentation. The individual and combinational effects of the factors, i.e. substrate amount, initial moisture, fermentation time, temperature and size of inoculum were found to have significant effects on α-amylase production: the optimum values of the tested variables were 5 g, 70%, 94 h, 28 °C and 20%, respectively. The predicted amylase production (2819.24 U/g) was in good agreement with the value measured under optimized surrounding (2810.33 U/g). The molecular mass of purified α-amylase was about 52 kDa. The enzyme activity exhibited its pH optimum between pH 4.6 and 6.6, and it had maximal activity at 50 °C. The apparent Km and Vmax of α-amylase for starch were 4.1 mg/ml and 247.6 μmol/min, respectively. The activation energy (Ea) for starch hydrolysis was found to be 14.133 kJ/mol. The enzyme was thermostable with half-life (t1/2) of 110 min at 80 °C and temperature coefficient (Q10) value of 1.0. Purified enzyme was activated by Ca2+ and inhibited by Hg2+ ions. EDTA also inhibited the enzyme activity, indicating that the purified enzyme is a metalloenzyme

Evaluation of some effective potentialities of newly formulated rice fermented food using Elephantopus scaber L. rhizome as herbal starter

Traditionally, fermented food and beverages are prepared by adding a mixture of plant residues as a starter or source of microbes. Most of the conventional fermented foods use a local starter which contains a mixture of herbs or old ferment or otherwise cereal dust-coated tablet. In this study, we have made an attempt to prepare a rice-based fermented food with the herbal starter (0.5% w/w) of Elephantopus scaber L. rhizome, and also examined its microbial and nutrient profiles. The food product is fortified with organic acid and titratable acidity of 0.58% and also contained an excellent source of microbes (LAB and Bifidobacterium sp.). The fermented food contains significant amount of fat, protein, minerals, vitamins, oligosaccharide, unsaturated fatty acids (ω3, ω6, ω7 and ω9) and a pool of free amino acids. The presence of phytochemical contents in the fermented rice was also exhibited significant effects against commercially available free radicals (DPPH, ABTS, FRAP and OH-radicals). Thus, food-grade microbes containing newly formulated fermented food would provide essential macro-and micro-nutrients to the individuals and convey the sustainability of good health. Therefore, the mentioned plant part would be used as an effective starter for aiding rice-based food products

Dietotherapeutic potency of ornamental lentil dumpling, a traditional food preparation from South West Bengal, India

Gahana bori (in Bengali) or ornamental lentil dumpling is a state-of-art preparation designed in the form of paisleys, ornaments or flowers, used as a decorative adjunct with the main dish.. Here, we have made an attempt to evaluate the dirtotherapeutic potency of this traditional preparation. The principal ingredient is the Vigna mungo (blackgram/ urad bean). In its preparation, the soaked bean is pasted and placed on a cloth piece having a central small pore. The fermented paste is squeezed onto the poppy seeds containing plate in such a way that it looks like an ornament. The sundried preparation is generally fried in oil and served along with the meal. For the first time, we have scientifically explored Gahana bori. The number of total aerobes, total anaerobes, yeast, mould, and LAB were increased during soaking. The contents of free phenolics and flavonoids were increased in the fermented paste and that also reflected by the higher in vitro DPPH antioxidant activity. The levels of B-group of vitamins particularly the quantity of riboflavin, thiamin, folic acid, vitamin B12, and vitamin C were also enriched in the products. The water extract of this product exhibited a notable antibacterial activity against enteropathogens. Thus, the lentil-based Gahana bori is not only improved the appearance or presentation of food product but also the same have a good health beneficial potentiality

Reutilization of waste fungal biomass for concomitant production of proteochitinolytic enzymes and their catalytic products by Alcaligenes faecalis SK10

Fungal biomass, being organic waste, could be an excellent source of protein, carbohydrate and minerals. However, it has not been exploited fully until now. Efficient management of this waste can not only address the environmental impact on its disposal but also yield value-added metabolites. In the present study, in order to explore its potential, we subjected dead fungal biomass of Aspergillus niger SKN1 as substrate for both fermentative and enzymatic biodegradation, respectively by potent proteo-chitinolytic bacteria Alcaligenes faecalis SK10 and its enzyme cocktail. The results revealed that reasonable amount of protease and chitinase could be biosynthesized by the fermentative mode of utilization, while a mixture of amino acid, peptides and low-molecular weight amino-sugar (mono and oligomeric form of N-acetylglucosamine) could be generated through enzymatic hydrolysis. The physicochemical condition of both the bioprocess was subsequently optimized through statistical approach. The projected utilization of waste zero-valued fungal biomass offer a sustainable and environmentally sound method for production of microbial metabolites and large scale execution of the same could be proficient and in tune with the principle of circular economy

Parametric optimalization of submerged fermantation conditions for xylanase production Bacillus cereus BSA1 through Taguchi Methodology

Extracellular xylanase production of Bacillus cereus BSA1 was optimized under submerged fermentation using Taguchi orthogonal array (OA). An L18 layout of OA was constructed at three-levels of six factors, i.e. temperature, pH, and xylan, Na2HPO4, NH4NO3 and NaCl concentrations, influencing the xylanase synthesis. The enzyme production was studied in 18 parallel batch systems using different levels of each factor. The results were processed with Qualitek-4 software using ‘bigger is better’ quality character, and combination of 35 oC; pH 6.0; and xylan 0.5; NH4NO3 0.5, Na2HPO4, 0.1; NaCl 0.05 concentrations (in w/v %) with a predictive xylanase production of 7.404 U/ml was obtained. Fermentation experiment was performed for further validating the statistical output, and it resulted 10.24% in the xylanase yield (from 6.44 U/ml to 7.10 U/ml) as compared to one variable at a time (OVAT) design. Interaction effects of the factors individually and in combination can be evaluated by using Taguchi method design of experiment

Screening of health beneficial microbes with potential probiotic characteristics from the traditional rice-based alcoholic beverage, haria

Fermented foods are natural habitats of various food-grade microorganisms which not only fortify the food material with bioactive molecules, but they could directly exert health beneficial effect to the consumers. The present study aimed to screen the microbial consortium of haria (a traditional alcoholic rice beverage), for therapeutic potentiality. Twenty-nine fermented beverage samples were collected from different areas of Bankura District (West Bengal, India).Initially, 45 dominant bacterial isolates were purified from the collected samples. From these, 3 microorganisms were screened out based on growth and acidification kinetics: these proved to be Bifidobacterium sp. (MKK4), Pediococcus lolli (MKK21), and Lactobacillus sp. (MKK37) isolates. Finally, based on a cumulative probiotic score, MKK4 (Bifidobacterium sp.) was selected for further studies. The ubiquitous presence of this strain in the collected samples was confirmed through PCR-DGGE fingerprinting. This strain was considerably stable in simulated acid and bile solutions; it also exhibited strong auto-aggregation and cell surface hydrophobicity of 82% and 53%, respectively. Under conditions of nutrient depletion, the isolate was capable to form biofilm (66.3%). The selected bacterium showed strong antimicrobial activities against Shigella dysenteriae MB14, Salmonella typhi E 1590, Micrococcus luteus ATCC 9341, Staphyloccus aureusMB13, Vibrio cholerae K510, and Escherichia coli ATCC 25922 isolates. These results suggest that the food-borne Bifidobacterium sp. MKK4 can be used as potent probiotic agent

Effect of microbial load on the condition index of the edible oyster, Saccostrea cucullata in the Sundarbans, India

The effect of microbial load on the condition Index of the edible oyster, Saccostrea cucullata were analysed on monthly basis during 2010 and 2011 from the three different stations (Namkhana, Frasergaunge and Sajnekhali) of Indian Sundarbans. The results showed significant variation with respect to microbial load between stations and seasons, which is reflected in the tissue of edible oyster. Significant positive correlations were observed between microbial load of the ambient environment and the tissue system of oyster. The Condition Index of the oyster species also exhibited negative correlation with the microbial load of oyster tissue, which confirms the negative stress induced by microbes on the growth and survival of the species

Hepatotoxic effect of Rifampicin as an Anti-Tuberculosis drug on male Albino rat

Tuberculosis is one of the serious airborne infectious diseases. Rifampicin is commonly used as anti-tuberculosis drug which creates drug-induced hepatotoxicity. Physiologically, liver maintains metabolic homeostasis and also regulates the detoxification process. The study of rifampicin mediated hepatotoxicity had been performed on male albino rat after its oral administration with a dose of 50 mg/kg body weight/day for 14 days. Several biochemical markers like serum glutamate pyruvate tranaminase (AST), serum glutamate oxaloacetate transaminase (ALT), alkaline phosphatase (ALP), lactate dehydrogenase (LDH), serum total protein, serum bilirubin, serum cholesterol were considered to evaluate the toxicity. Significant elevation of level of AST (115.89%), ALT (134.40%), ALP (46.15%), serum cholesterol (91%) and bilirubin content (119.44%) had been observed in treated group compared with control group. High level of MDA content as lipid peroxidation marker was also been noticed in drug induced group. Histopathological studies had shown the disintegrated hepatolobular structure with dilated central vein. All these findings indicated that the selected dose of rifampicin is hepatotoxic; proper monitoring and care are essential during the treatment of tuberculosis. Keywords: rifampicin; hepatoxicity; anti-tuberculosi