Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
Journal of Survey in Fisheries Sciences
Cheese considered as a well-known dairy product which is manufactured in many varieties according to its texture and flavors. Cheese is formed by coagulation of casein and having high protein contents. Due to increase awareness of modern consumers' fortification of dairy foods including fresh cheese are in demand. Cheese analogues are made for fulfilling the demand of cheese. Cheese analogues are processed cheese-like product and enriched in nutrients. It is healthy and seems to be attractive when it is rearranged and prepared by using ingredients coming from natural source. Cheese analogue produced from olive oil is used as an alternate of cheese. Olive oil improves cardiovascular risk factors, such as endothelial dysfunction, blood pressure, postprandial hyper-lipidemia, lipid profiles, antithrombotic profiles and oxidative stress. The objective of present study is to develop cheese analogue using olive oil and Lactobacillus bulgaricus. Single step emulsification was done for fat stabilization. L. bulgaricus was isolated from yoghurt. Cheese analogue was subjected to physicochemical, microbiological and sensory analysis. Proximate analysis (moisture, pH, fat contents, ash, total solids and acidity) physicochemical analysis, sensory analysis and rheological analysis were performed. Physiochemical investigation has demonstrated that, with an increase in the olive oil level in cheese, non-significant pH, moisture, fat, total solids, total nitrogen and protein content were considerably influenced by olive oil amounts. Rheological research showed that olive oil quantity has a substantial effect on curd texture. Flavor and overall acceptance were significantly affected by days and concentration. Samples indicate more substantial results and general acceptance compared to other samples treated with minimum olive oil concentrations. The data obtained was analyzed statistically.
Journal of Oleo Science
had soaked dried vegetables and herbs in locally squeezed olive oil to keep them from degradation reactions. Flavored oils can also be obtained in many ways: as adding whole spices, ground spices, essential oils or oleoresin oils, or prepared and filtered oil/vinegar 15. In the Mediterranean there are some alternative practices for steeping, including adding flavoring ingredients directly into the mill as the olives are being pressed and getting the oil to get a flavored product right away, particularly with fresh lemons 1. Thus, flavored oil is obtained and consequently, it was used for pasta sauces, as a dip for bread, and salad dressing. Flavored oils had been used by all the peoples of the Mediterranean according to their traditional uses 7. So, the herbinfused olive oil was used on crunchy bread by Italians, while olive oil infused with black peppercorns, garlic, brandy and hot red peppers are used by Portuguese, and that infused with hot red peppers and herbs were used by Spanish. Recently, flavored olive oils have gained more attention. It prepared by soaking aromatic herbs in the oil so that the organoleptic properties and stability are modified. However, this process causes the extraction of undesirable Abstract: In this study, the effect of adding some aromatic plants (garlic, rosemary, thyme, and hot-red pepper) on the quality and organoleptic properties of flavored olive oil extracted from the olive fruits Maraqi variety are studied after adding aromatic plants at a concentration of 2%. Acidity, peroxide value, K232, K270, sensorial attributes, oxidative stability, and phenolic contents had been monitored. Also, phenolic compounds are identified in the flavored and unflavored olive oil samples. These results demonstrated that the aromatic plant had enhanced the flavored olive oil stability; the levels of addition of aromatic plants could be distinguished by the taster's sensory attributes of flavored olive oil. As the plan of the experiment includes process preparation and consumer preference, it is possible to apply the obtained results to the production of flavored olive oil. The producers will gain a new product with more added values due to the nutritional and antioxidant strength of the aromatic plants.
International Journal of Chemical and Process Engineering Research, 2015
Cheese analogues are cheese-like products with varied compositions and functional properties which produced by partial or whole replacement of milk components, in particular milk fat, by non milk-based components. The purpose of this research was to evaluate the effect of replacement of milk fat in processed cheese with different formulations from olive, corn and sesame oils on some chemical and sensory properties. The results indicated that the peroxide values were not affected by the replacement of milk fat with vegetable oils significantly (P <0.05), while the free fatty acid content was slightly but significantly affected. These two values were significant (P <0.05) increased during the three months of storage. The cholesterol contents in the cheese samples with olive, sesame and corn oils were 86.9, 84%, and 83.1%, respectively lower than those of the whole milk cheese sample. The replacement of milk fat with vegetable oils did not affect the appearance, color and tenderness of the processed cheese samples. The replacement of milk fat with vegetable oil significantly (P <0.05) affected the flavor of the cheese analogue samples.
Plant Foods for Human Nutrition, 2016
We have compared three different production methods, which may be suitable to obtain flavored olive oil. The comparison was made employing two different herbs, thyme and oregano. The traditional and widespread method consist in the infusion of herbs into the oil. A second scarcely diffused method is based on the addition of herbs to the crushed olives before the malaxation step during the extraction process. The third innovative method is the implementation of the ultrasound before the olive paste malaxation. The main objective of the study is to verify the effect of the treatments on the quality of the product, assessed by means the chemical characteristics, total phenol content and radical scavenging activity of the resulting oils. Simultaneously, considerations on the efficiency, time consumption and labor, were made to identify the more suitable method for the large scale production, in order to enhance product quality and improve the process efficiency. The less favorable method was the addition Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation of herbs directly to the oil. A positive effect was achieved by the addition of herbs to the olive paste and other advantages were attained by the employment of ultrasound. These last two methods allow to produce oils "ready to sell", instead the infused oils need to be filtered. Moreover, the flavoring methods applied during the extraction process determine a significant increment of phenolic content and radical scavenging activity of olive oils. The increments were higher when oregano is used instead of thyme. Ultrasound inhibited the olive polyphenoloxidase, the endogenous enzyme responsible for olive oil phenol oxidation. This treatment of olive paste mixed with herbs before malaxation was revealed as the most favorable method due the best efficiency, reduced time consumption and minor labor, enhancing product quality of flavored olive oil.
Food Research, 2020
In the present study, a comparative analysis was undertaken on the possibilities of using olive oil in fresh spreadable cheese either emulsified or encapsulated. The changes in titratable acidity, active acidity and total Lactococcus count were recorded continuously throughout the storage period. At the end of the storage period, Lactococcus count in the samples with encapsulated oil were found to be slightly higher (7.7 and 7.8 log CFU.g-1 respectively) in comparison with the control sample (7.5 log CFU.g-1 ). A significantly higher content (P < 0.05) of unsaturated fatty acids (56.88 g per 100 g fatty acids) and a lower peroxide value of extracted fat (0.35 meqO2.kg-1 ) were found in the fresh spreadable cheese samples with 4% (w/w) encapsulated olive oil and extract of dill used as antioxidant in an amount of 0.003% (v/v). The addition of antioxidant (dill extract) further reduced oxidation process and enhanced cheese functionality. The sensory profile of the fresh cheeses, co...
International Journal of Dairy Science, 2015
Olive oil was laboratorial extracted by pressure system from olive fruit variety Koroneiki by using different concentration of sodium chloride (NaCl) during malaxation step. Using 2% NaCl was the best concentration where it enhanced oil extraction, improved the quality of the resultant oil as well as increased oil stability. The resultant olive oil was used in preparing of cheese yoghurt. Fermented buffalo milk (after adding the starter) was divided into three portions, the first portion serve as control while, the second and third part was fortified with 1 and 2% (w/w) of the extracted olive oil, respectively. The three portions were manufactured cheese yoghurt by the traditional method. Results revealed that samples manufactured by 1% olive oil gained the highest sensory scores, they possessed good flavor, acceptable body and texture and favorite appearance. These properties were gradually decreased with the progress of storage (after 2 weeks) to reach the minimum scores at the end of storage. Generally, the values of pH decreased during cold storage until 3 weeks; whereas, TS, TP increased in all treatments and TVFAs took the same trend. Acetaldehyde and diacetyl contents were also increased until 2 weeks then they began to decrease until the end of storage (3 weeks) in all treatments. Total viable count and lactic acid bacteria were gradually increased during storage at 5±1°C till the first week then it decreased through the remaining period of storage (2 weeks). Control and treatments behaved the same trend. Yeast and molds were not detected throughout storage. All samples were free of coliforms. So, It could be concluded that using of olive oil in preparing cheese yoghurt did not clearly affected the chemical and microbiological properties of the resultant product; however a noticeable improvement in the sensory properties was observed when used 1% olive oil.
International Journal of Food Science, Nutrition Health and Family Studies
The aim of this study was to make sure that there are no health issues for ordinary virgin olive oil (OVOO) category, through a biological study. Twenty-four male Albino rats weighting approximately 200 grams were divided into four groups, each group containing six rats. Group G1 fed on basal diet as a control negative group. The fat was replaced in the other three groups as follow: group G2 fed on basal diet with extra virgin olive oil (EVOO), group G3 fed on basal diet with OVOO and group G4 fed on basal diet with olive oil (OO) (mixture of virgin olive oil and refined olive oil). The experimental period was 60 successive days. At the end of the experiment lipid profile, liver functions, kidney functions and the activities of SOD, CAT, GSPx, GSH and MAD levels were determined. Undisputedly, EVOO had the best results in all study. OVOO did not affect negatively on all parameters unlike olive oil (contains refined olive oil) which caused significant increases in TC, LDL, VLDL, TG and MAD levels and also increased ALT, AST, ALP, SOD, CAT GSPx activity whereas HDL and GSH levels were decreased. Moreover, OVOO did not show any histopathological alterations in examined liver sections. .
Cheminform, 2003
For Abstract see ChemInform Abstract in Full Text.
Foods
1) Background: Extra virgin olive oil (EVOO) is responsible for a large part of many health benefits associated to Mediterranean diet as it is a fundamental ingredient of this diet. The peculiarities of this golden, highly valued product are in part due to the requirements that must be met to achieve this title, namely, it has to be obtained using exclusively mechanical procedures, its free acidity cannot be greater than 0.8%, it must not show sensory defects, and it has to possess a fruity taste.
Applied Sciences
Virgin olive oil (VOO) has unique chemical characteristics among all other vegetable oils which are of paramount importance for human health. VOO constituents are also responsible of its peculiar flavor, a complex sensation due to a combination of aroma, taste, texture, and mouthfeel or trigeminal sensations. VOO flavor depends primarily on the concentration and nature of volatile and phenolic compounds present in olive oil which can change dramatically depending on agronomical and technological factors. Another aspect that can change the flavor perception is linked to the oral process during olive oil tasting. In fact, in this case, some human physiological and matrix effects modulate the flavor release in the mouth. The present review aims to give an overview on VOO flavor, with particular emphasis on the mechanisms affecting its production and release during a tasting.
Journal of Food Lipids, 2007
ABSTRACTA study is reported on the chemical and sensorial characteristics of extra virgin olive oil flavored with hot pepper, garlic, oregano and rosemary during 7 months of storage. The oils were prepared by addition of the spice oily extracts at three different levels of concentration to an extra virgin olive oil. The following parameters were monitored: acidity, peroxide value (PV), K232, K270, (E)-2-hexenal/hexanal ratio and sensorial characteristics. At the end of the storage, all samples showed PV and K232 values lower than the control, whereas similar values of acidity, K270 and (E)-2-hexenal/hexanal ratio were observed. These results demonstrated that the herb and spice extracts improved the stability of the extra virgin olive oil. Tasters were able to distinguish among the levels of addition, and at the end of the storage, they preferred the oils flavored with 20 g/L of rosemary, 40 g/L of hot pepper, 40 g/L of oregano and 30 g/L of garlic.A study is reported on the chemical and sensorial characteristics of extra virgin olive oil flavored with hot pepper, garlic, oregano and rosemary during 7 months of storage. The oils were prepared by addition of the spice oily extracts at three different levels of concentration to an extra virgin olive oil. The following parameters were monitored: acidity, peroxide value (PV), K232, K270, (E)-2-hexenal/hexanal ratio and sensorial characteristics. At the end of the storage, all samples showed PV and K232 values lower than the control, whereas similar values of acidity, K270 and (E)-2-hexenal/hexanal ratio were observed. These results demonstrated that the herb and spice extracts improved the stability of the extra virgin olive oil. Tasters were able to distinguish among the levels of addition, and at the end of the storage, they preferred the oils flavored with 20 g/L of rosemary, 40 g/L of hot pepper, 40 g/L of oregano and 30 g/L of garlic.PRACTICAL APPLICATIONSThis research is strongly oriented to the industrial application. The obtained results could be immediately applied to flavored olive oil production since the experimental plan includes the set-up of the process and the preference of consumers. Producers will acquire a novel product having a greater added value (due to the nutritional and antioxidant power of the spices) but without changes in the plants already present in the factories and, thus, without increases in costs.This research is strongly oriented to the industrial application. The obtained results could be immediately applied to flavored olive oil production since the experimental plan includes the set-up of the process and the preference of consumers. Producers will acquire a novel product having a greater added value (due to the nutritional and antioxidant power of the spices) but without changes in the plants already present in the factories and, thus, without increases in costs.
Colloids and Interfaces
Bitter taste is a positive sensory attribute that correlates with the concentration of phenols in olive oil. However, excessive bitterness can be perceived by consumers as a negative attribute. The aim of this investigation was to improve the process of debittering Don Carlo extra virgin olive oil (EVOO), which is rich in phenols, through blending with newly produced Leccino EVOOs, which can provide high oleuropeinolytic activity. The debittering process of blending Don Carlo EVOO with two types of Leccino EVOOs (decanter and settled EVOO), was carried out during three months of storage in canisters placed in fixed positions, or periodically inverted to prevent sedimentation. The reduction in phenolic concentration and bitterness index (K225 value) reached maximum values of 51% and 42% respectively in Don Carlo EVOO mixed with Leccino settled EVOO after three months of storage in periodically inverted containers. Analytical indices and sensory analysis, in accord with bitterness ind...
Olive oil, and especially virgin olive oil (VOO) and extra VOO, has great interest worldwide because of its unique fatty acid profile, phenolic compounds with positive health properties for the human health and appreciated aroma profile. However, the composition of VOO can change dramatically depending on the olive variety, field management, olive fruit maturity degree, harvesting and processing, which can affect its final characteristic flavour. At industrial level, the extraction conditions applied can affect the concentration and composition of phenolic and volatile compounds, with possible negative consequence and the formation of off-flavours. Olive crushing, malaxation, centrifugation, filtration and storage were reported to be all possible factors affecting VOO flavour. The present review paper describes the factors affecting the virgin olive oils composition, with a focus on the aroma compounds, biophenols and the resulting sensory profile. A particular focus was put on the volatile and phenolic compounds and their relation with the sensory description and impact of the final flavour. In conclusion, many factors still need to be studied to fully understand the complex composition and interactions of this appreciated product. This information is also relevant and useful both for scientific knowledge and for its industrial application, as producers can modulate the final characteristics of the VOO.
The effect of fortification with olive oil on yoghurt quality was investigated. Control yoghurt was made using classic yoghurt culture and whole milk. Other four yoghurt treatments were made by ABT-5 culture and whole milk fortified with 0, 1, 2, and 4% virgin olive oil. The sixth treatment was prepared using ABT culture and skim milk with 4% virgin olive oil. Changes in rheological, chemical, microbial and organoleptic properties of yoghurt were monitored during refrigerated storage (4°C) of yoghurt for 15 d. Samples of yoghurt with added olive oil to whole milk showed a slight decrease in titratable acidity during the 180 min of fermentation. Adding of olive oil had no clear effect on coagulation time and curd tension whereas decreased the syneresis of yoghurt. Acidity, TS, fat and TVFA contents of yoghurt supplemented with olive oil were higher than those of control whereas the contents of TN and WSN were similar in both. Yoghurt samples fortified with olive oil had less numbers of TVBC. The addition of olive oil improved the viability of lactic acid bacteria and bifidobacteria. The bifidobacteria counts were sufficient to yield numbers of beneficial organisms that were higher than the accepted threshold (106 cfu.g-1) for a probiotic effect. Also, olive oil adding improved the body, texture and flavor of the yoghurt.
Molecules, 2020
In this study, the influence of phenolic compounds on the sensory scores attributed to extra virgin olive oil (EVOO) by panel test was investigated. Two model olive oils (MOOs) with identical concentrations of volatile compounds, differing only in the amount of biophenols (297 vs. 511 mg kg −1), were analysed by two official panels and by SPME-GC/MS. Six other MOOs set up by the two previous models were also tested and analysed. They were formulated separately with the addition of three off-flavours ('rancid', 'winey-vinegary' and 'fusty-muddy'). While high levels of EVOO phenolic compounds did not produce any effect on the headspace concentration of volatile compounds, they did affect the scores of both positive and negative sensory attributes of EVOO, due to the well-known in-mouth interactions between EVOO phenols, saliva and volatile compounds. In particular, a decrease of about 39% in the positive fruity score was found in the presence of a higher concentration of phenols. Regarding EVOO off-flavours, the higher level of phenolic compounds decreased by about 23% the score of 'fusty-muddy' defect and increased the score of 'winey-vinegary' defect about 733%. No important effect of EVOO phenolics on the perceived intensity of the 'rancid' defect was found. These findings could be helpful in explaining some discrepancies of panel test responses observed during extra virgin olive oil shelf life.
Molecules, 2019
Olive oil is not only known for its pungent, bitter, and fruity taste, but also for its health potential, which is often hypothesized to depend on its phenolic compounds. One hundred extra virgin olive oil samples (monocultivaric as well as blends of varieties) were assessed with regard to their sensory properties and phenolic compound composition. Nineteen phenolic compounds have been determined and correlated with sensory data. In all olive oil samples, oleocanthal and oleacein were the most abundant phenolic compounds, with average amounts of 77.9 mg/kg and 41.8 mg/kg, respectively. The highest correlation coefficient between a sensory descriptor and the phenolic compounds was found for the bitter taste sensation and the total phenolic content with r = 0.72 and in particular, for 3,4-DHPEA-EA, with r = 0.57. Intensity plots were assessed for the three main sensory descriptors fruitiness, bitterness, pungency, and for the quality factor harmony, which is associated with the degree of ripeness aroma of olive oil. Positive correlations for the aroma descriptors freshly cut grass, leaves, and nuts, and the phenolic compounds were especially observed for oleoside 11-methylester and vanillic acid. The present study provides a comprehensive database of phenolic compounds in olive oils from six different varieties and seven countries.
Foods
The goal of this work was to investigate the impact of the flavoring of some aromatic plants/spices, including rosemary (R), lemon (L) and orange (O) at the concentration of 5% and 35% (w/w) added by 2 methods (conventional maceration and direct flavoring), on quality attributes, chemical changes and oxidative stability of extra virgin olive oil (EVOO). Six flavored oils were obtained (EVOO + O, O + O, EVOO + R, O + R, EVOO + L and O + L). The physicochemical parameters (water content, refractive index, acidity and peroxide value, extinction coefficient, fatty acids, volatile aroma profiles, Rancimat test, phenols and pigments composition) of the flavored oils were investigated. Based on the results obtained, it was observed that flavoring with a conventional process provided increased oxidative stability to the flavored oils, especially with rosemary (19.38 ± 0.26 h), compared to that of unflavored oil. The volatile profiles of the different flavored oils revealed the presence of 3...
Journal of Food Quality, 2022
This research was conducted to evaluate consumer preferences of seven extra virgin olive oils (EVOOs) from foreign and Tunisian cultivars. Two studies were carried out. The first is a comparative physicochemical characterization of the VOOs tasted by the consumers. The second is a consumer survey where each consumer tasted each VOO six times. Using simple linear regressions, we have performed a new method that gives a pairwise comparison between the oils. It revealed that Coratina and Chetoui cultivars were the most preferred revealing by the high concentration of polyphenols with 468 and 525 ppm, respectively, and Arbequina was the less preferred with 182 ppm. We have then performed a principal component analysis on the data composed by the physicochemical parameters that highly discriminate between cultivars. The latter showed important differences between the most and the less preferred oils and that oxidative stability, palmitic, palmitoleic, oleic, and linoleic fatty acids, tri...
Mljekarstvo, 2016
The present paper is focused on the physicochemical and sensory parameters of low-fat white brined cheese-like product obtained from the substitution of milk fat by milk-olive oil emulsion, in comparison with full and low-fat control cheeses. Formulated milk samples were initially pasteurized at 63 °C for 30 min, cooled down to 35 °C, and subsequently 0.35 mL L-1 of microbial rennet were added. The obtained cheeses were stored at 4 °C during 24 hours and then analyzed for physicochemical and sensory properties. The replacement of milk fat in white brined cheese resulted in a lower total solids content due to the higher water-binding capacity of fat replacers used. Fat content was significantly higher for low-fat white brined cheese-like product than in low-fat control cheese. This result was attributed to fat retention capacity of the fat replacers used. Lipolysis index was the highest in the case of low-fat white brined cheese-like product due to changes in cheese microstructure after fat replacers incorporation in low-fat products. Milk-olive oil emulsion showed the lowest cheese-making yield compared to its full and low-fat counterparts. The cheese like-product sample received a significantly lower overall impression score by the panelists than full and low-fat cheeses.
Foods
The influence of semi-hard (C1), hard (C2), and soft whey cheese (C3) immersed in extra virgin olive oil (EVOO) on its oxidative and hydrolytic parameters, fatty acids, and phenolic composition during two months of simultaneous storage was investigated. Accelerated hydrolytic and oxidative degradation was noted in EVOO stored with the immersed cheese compared to control oil. Oxidation indicator (K232), myristic (C 14:0), and trans-oleic fatty acid (C18:1t) exceeded the prescribed limit for the EVOO category in oils stored with immersed C1 and C2, which indicated that standard analytical parameters are ineffective as tools to examine the declared quality and authenticity of such topping oils. The noted changes in fatty acid profile were primarily prescribed to the migration of fats. C1 and C2 influenced a comparable reduction in EVOO total identified phenolic content (−92.1% and −93.5%, respectively), despite having a different content of total proteins and moisture, whereas C3 influ...
European Journal of Lipid Science and Technology, 2016
Changes in chemical and sensory characteristics of Chemlali extra-virgin olive oil as depending on filtration †
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.