Syneresis is separation of why from milk gels, it is important to fermented dairy products because cheese moisture is influenced by the amount of whey expelled and yogurt need to avoid whey separation to keep product quality during storage. Many methods have been carried out to determine syneresis of gels which can technically be summarized into three types: centrifugation, cutting and mesh container drainage. Centrifugation method is widely used with different centrifugal force such as 3000 g, 30 min, 4 °C (Yeh and Yeh 1993), and step centrifugation from 100 to 300 g-force, 10 min (Harwalkar and Kalab 1981). But this method only represents the ability of curds to hold serum with extra force as many other studies called water-holding capacity or serum-holding capacity (degree of solvation). In cutting method, curds are directly cut (Calvo and Balcones 2000) in many ways which is hard to maintain identical in repeated trials. On the other hand mesh container drainage method is done by putting a curd in mesh container with another vessel under it in which way the whey of …show more content…
(1) The first one was to evaluate the accuracy of syneresis test. Syneresis test was carried out in 6 parallels for rennet curds and was repeated twice in a month by different laboratory equipment. (2) Rennet gels experiment included two factors, namely sterilized condition and acidification pH pre to rennet coagulation. Sterilized conditions were 65 °C for 30 min, 72 °C for 5min and 80 °C for 5min and acidification pH was 6.4, 6.2 and 6.0. (3) Acid gels experiment also includes sterilized condition and acid pH. Sterilized conditions were 95 °C for 5 min, 90 °C for 5min, 85 °C for 5min and the ending pH of acidification was 4.7, 4.2 and 3.9. Then performing syneresis evaluation, protein analysis, microstructure analysis of rennet curds and acid
However, once it reaches 70% of concentration, the enzyme becomes saturated, meaning that there are no active sites for the substrates to fill, which leaves casein (milk) molecules suspended in the curd; the saturation point for this curve was located at 6.5x 10-3 seconds. This was clearly evident in some of the visual results of the practical, where we could see that there was still milk that could be decanted when the curd was poured out. Therefore, even if we added more casein substrate, the curve enzyme activity would still flatten, indicating again that all or most of the active sites of the renin enzyme were full.
The Effect of Temperature on the Activity of Rennin in Milk Aim: To find out what effect different temperatures have on the enzyme, rennin, in milk. Introduction An enzyme is a biological catalyst. It speeds up a reaction by lowering the activation energy required to start the reaction. It speeds up a reaction, but remains unchanged unless certain limiting factors are introduced.
After finding out that Xanthan Gum and Whey Protein Concentrate were combined in an emulsion that will not destabilize, it was tested at certain temperatures. When this emulsion was tested at 4℃, this emulsion stayed stable. At 12℃, it separated 2 mL. As the temperature got hotter, it separated quicker. At 50℃, it came apart 3 mL. After 15 minutes at 80℃, it had separated all 10 mL. With water at 4℃ the emulsion stayed together the longest.
To investigate the osmotic effect of changing the concentration of sucrose solution; distilled water, 20% sucrose solution, 40% sucrose solution, 60% sucrose solution on the change in mass of potato cylinder after 30 minutes of being in solution.
Since the beginning of time, people have been drinking milk. Even today you will find a gallon of milk in almost every refrigerator in America. Milk is, and has always been, a staple of our diet. Because it contains essential proteins, carbohydrates, fats, minerals and vitamins, milk is considered one of nature's perfect foods. Unfortunately, throughout the last century milk has been subjected to many forms of modern processing practices, which deprive milk from many of its natural qualities and benefits. Therefore many essential vitamins and enzymes are lost. Processing milk has altered one of nature’s perfect foods and changed it into something nature did not intend. Because of the abundant health benefits in raw milk, this report will explain why it should be made legal for consumers to buy throughout the United States.
The purpose of this experiment is to detect what kind of macromolecules are present in these three types of milk by using the Benedict’s solution, Lugol’s solution, and Sudan IV solution. Also, using the nutrition facts labels to identify which substance is skim milk, whole milk, and soy milk. Hypothesis: Using the Benedict’s solution to detect for the presence of simple sugar. If the unknown A, B, C milk samples turn from bright blue to orange color during the Benedict's test, then these samples are positive control and the carbohydrates are present in them.
Many types of microorganism that is used for the making of cheese. These microorganism are used to acidify the milk. The acidifying milk is a very good condition for the curd and whey to be easily separated. At this condition, the growth of any bacteria in the cheese can be
Varying Concentration of Rennin and Its Effect on the Goagulation Time of Milk Scientific Knowledge Enzymes Enzymes are large molecules, which are protein in nature. They are biological catalysts that speed up chemical reactions in the body. They operate by a "lock and key" method. The Enzyme has a certain "lock" (active site) that only a specified substrates "key" will fit into.
What Makes Human Milk Special? (Mar-Apr 2006). New Beginnings Vol. 23 No.2 , pp 82-3.
Although the milk itself does not have a very long life, other foods and some dairy products can be made using it. Cheese would be the main example of this, which can be produced simply by the curdling of milk. Rennin, found in the substance rennet, is a milk-coagulating enzyme capable of assisting in the production of cheese. Therefore the temperatures at which the milk and rennet coagulate best at in this experiment, are
Emulsions are important in food science. Not only do they provide an important sensory aspect in many foods, but a functional one as well. From hollandaise to ice cream, getting hydrophobic and hydrophilic molecules to play nice with each other can be a difficult task. According to Modern Cuisine, it was previously thought that Hollandaise, a classic French emulsion of egg and butter, could only be made by letting butter drip from natural heat of the hand. Of course, modern science has taught us that, with the use of emulsifiers, these mystic mixtures can be created without the voodoo and magic once thought necessary. This paper will discuss emulsions as applied to hollandaise, chocolate, hot dogs and their characteristic pH, moisture content, shelf stability and quality of viscosity. An explanation of the chemical processes that occur between the raw ingredients of each food and the relationship between the structure and function of their components will be explained, as well as the importance of the chemical changes that take place during production. The characteristics that define these foods as emulsions will be compared and contrasted to further elucidate the mystery of the emulsion. Bon Appetite!
Pasteurization is a process that kills microbes mainly bacteria in food and drink such as milk, juice and others. Louis Pasteur was the first to discover inactivation of microorganisms by heating for the prevention of spoilage of wine in 1860 (Pescott et al., 1990). The purpose of pasteurization is not to sterilize a substance but to eliminate the disease causing pathogens. In food industry, particularly in dairy farming, many heating processes are present among the different types of fluids. Processes like sterilization, chilling of milk and pasteurization are strictly required to be cheap.
The freshly squeezed citrus juices of Lemon,lime and orange were analysed through titration over the period of 2 weeks. Initially the lime juice was found to be slightly more acidic than the other juices followed by lemon juice and then orange juice since it is known that usually lime is more acidic than lemon and orange. It was hypothesised that the acidity of each juice will increase or decrease after the period of two weeks depending upon the sugar content of that citrus fruit that the juice is extracted from. The acidity of the juice with the highest sugar level will gradually increase over the period of time since sugar contribute to the the fermentation of the citrus juice to lactic acid. The hypothesis was shown to be correct;however
Food rheology has long been applied in many areas of the food industry to optimize the food product development, processing methodology and finishes product quality assessment. Generally, food rheology is the study of the food respond to the applied stress or strain and generate the information on the insight of the food structural organization (Farid, 2010). The rheological data are essential in many areas of the food industry such as processing engineering calculation, determining the ingredient functionality in product development, intermediate or finish product quality control, shelf life testing, evaluation of food texture by correlation to sensory data and analysis of rheological equations of state or constitutive
Food manufacturers use chemical in food processing because of huge economical profit. It is always cheaper to make low quality food rather than healthy food. Food manufacturers’ objectives are to find cheap methods to gain higher profit. The application of techniques such as pasteurization, fermenting and pickling are often use in food companies to prevent food from spoiling ahead of time. Their intention is to stock the food for a long period of time without worrying about early deterioration that can lead to major financial loss. Food companies use antibiotics in chicken, and steroids in cow to stimulate their growth. In an experiment, it was shown that injection of growth hormone in cow improves and stimulates milk production (Baldwin, 1995). Companies’...