1.
Effecacy Of Prebiotic Galacto-Olingosaccharides Produced In Low Lactose Skimmed Milk Powder By Transgalactosylation
by Tauseef Ahemd Faiz | Dr. Sanaullah Iqbal | Dr. M. Nasir | Prof. Dr. M. Athar Khan.
Material type: ; Format:
print
Publisher: 2013Dissertation note: Functional food does not only provide nutrition but works as defense against human nutrition related diseases (Menrad et al, 2000). Global market of functional foods industry has worth at least 33 billion US$ (Hilliam, 2000). Functional foods are the foods that provide health gains and can reduce the risk of diseases beside basic nutrition, including health care of gut. The first generation of functional foods involved supplementation of calcium (Ca) and vitamins for their recognized health attributes (Saarela et al, 2002). Among these additives, probiotics and prebiotics have acquired more interest as a major group of functional food additives (Gibson and Ziemer, 1998).
GOS present in commercial milk powder has the ability to promote the growth of bifidobacterium and lactobacilli in vitro reported by the studies (Cummings et al, 2001; Cummings, 1995).The market of GOS in infant formulae milk as a food ingredient and due to its bifidogenic properties is gaining popularity (Chow, 2002). GOS are chiefly used in infant milk formula and infant foods (Crittenden and Playne, 2009). Their remarkable thermostable properties allow them to be incorporated in large variety of foods and commercial products in addition to infant foods (Yang and Silva, 1995). Recently, they have been used in beverages (fruit juices and other acid drinks), meal replacers, fermented milks, flavored milks, and confectionery products (Affertsholt-Allen, 2007).
Laboratory scale reactions for GOS synthesis were carried out by dissolving 600mM lactose solution in phosphate buffer (0.1 M, pH: 6.8) to which £]-galactosidase at varying levels was added. As indicated by studies in the literature (Kim, 1997; Barbara et al, 2006; Playne et al, 2009), high lactose concentrations facilitate transglycosylation reactions.
Milk was procured from local market and concentrated for 15 min and milk was stored at refrigeration temp for further analysis. 5ml of milk samples was taken for enzyme analysis 0£gl, 100£gl, 200£gl, 300£gl and 800£gl respectively samples was collected at 30min
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and 1hr. Enzyme was denatured by applying heat and samples were analyzed on TLC with lactose and Yakult Oligomate (Oligomate 55N.) as standard.
Large scale milk trial was done with respect to our optimization trial is was carried out temprature of 42.5„a C with 2.5hr reaction time. 10litter milk was transgalactosylated and boiling was done at 100„a C to stop further enzyme acticity. Milk was dried through freeze drying technique in PCSIR lahore.
Mean values for proximate data of Milk powder is presented in table 4.4 shows Dry matter (96.03¡Ó1.12) while for Fat, Ash and Protein values respectively(18.04¡Ó1.53), (4.02¡Ó0.91) and (31.75¡Ó1.41) respectively.
The statistical analysis pertaining to Lactobacilli log10 cfu/g of feces in two groups of mice divided on the basis of prebiotic milk powder incorporation in their diet were highly significant (P <0.01) and also highly significant in study intervals. Similarly bifidobacteria and E.Coli log10 cfu/g in feces of mice were significantly different (P <0.01) in groups and with study interval times.
Functional food product milk powder containing transgalactosylated oligosaccharides milk powder can be used at extensive scale for human trials. This could be value added product in which we could produce prebiotic economically.
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3.
Determination of Biogenic Amines (Histamine & Putrescine) in Sea Fish Dr. Sanaullah Iqbal
by Faseeha Farooqi (2012-VA-541) | Dr. Muhammad Nasir | Prof. Dr. M. Athar khan.
Material type: ; Literary form:
not fiction
Dissertation note: Biogenic amines (BAs) which are the nitrogenous compounds with lower molecular weight and they are formed by the decarboxylation of free amino acids by bacterial activity in food products during fermentation process and storage of the food (Sorungbe, 2005). Diet having high concentration of these complexes are the main source of biogenic amines in body.The most communal biogenic amines which are identified in food are Putrescine, tyramine, histamine and cadaverine. Uncontrolled microbial enzymatic activity of bacteria causes them to accumulate in food (Adam et al. 1999).
Foods having high quantity of biogenic amines includes fermented vegetables, meat products, fish products, juices, dairy productand alcoholic beverages e-g wine and beer. When biogenic amine histamine is ingested it first reaches to the gastrointestinal tractwhere, it binds to some specific receptors if the detoxification system is not capable to remove it (Jarisch, 2004).
Biogenic amines in bodyinvolves inmany important physiological functions, if their level is high in the body then it signify a direct danger to human well-being. There are some drugs e-g ethanol inhibit enzymes of biogenic amines catabolic pathways (Bodmeret al. 1999).
Presence of biogenic amines can be bad indicator for meat it shows the presence of bacteria in meat which caused spoilage of meat (Miceal et al. 2007).
More quantities of biogenic amines in processed, cooked and fresh foodstuffs can be associated to low sterile quality meat. Histamine which is most common biogenic amine acts as vasodilator and neurotransmitter on cardiovascular system and on central nervous. If histamineexceeds to certain level in body then it causes vomiting,diarrhea,headaches, cramps,stomachache, nausea, migraineand hypotension (Moreira et al. 2008). Histamine stimulatesthe smooth muscles of the gastrointestinal tract and uterus, often increases the exoneration of acid release from gastric mucosa, diarrhea, stomach ache and cramps. Another signs ofhistaminases causes the allergic reactions to the skin which includes pruritus flush and urticarial. Reduction of biogenic aminesin food industry is amission for the future (Prithwiraj et al. 2010).
Improvement of diagnostic standard approaches for identification of biogenic amines in food product is good attention not only because of their toxicity level, on the other hand it can also be used as food quality indicators, consenting biogenic amine checking from raw materials to the ready to eat food. In corresponding, techniques for the identification of biogenic amines generating bacteria been established to access risk of biogenic amines formation in food content and to avoid their accumulation in eatable stuff. Safety of food is the main obligation that should be fulfilled during manufacturing process. While high intensity of biogenic amines are associated to customer health and their deliberations in food still not sufficiently standardized by governing organizations (Lehane et al. 2000). At present time, there are certainly no common regulations which defines the parameters and limits of biogenic amine tolerance in food products. Biogenic amine levels are irregularly distributed in food product on the other hand more control must be used on fermented food products of local source or got with traditional procedures (Paulsen et al. 2007).
It is assumed that the existence of biogenic foodborne harming or poisoning is generally underestimated for the reason that of misdiagnosis and under reporting. We believes that the scientific diffusion of the tools that identify or determine the development of biogenic amines in food and the hazards related to their consumption might contribute to increase the alertness and awareness of hands involved which encourages the more responsible portion and consumption of better protection and quality of food (Patange et al. 2005).
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