جستجوی مقالات مرتبط با کلیدواژه "نانو کامپوزیت" در نشریات گروه "کشاورزی"

In this study, the survival of Lactobacillus casei probiotic bacteria added to polylactic acid-nanocellulose nanocomposite film during 16 days of storage in the refrigerator was investigated. For this purpose, three edible films including polylactic acid, polylactic acid + nano cellulose, polylactic acid + nano cellulose+ Lactobacillus casei (9 log CFU/g) were prepared and the physical and mechanical characteristics of the films as well as the survival of Lactobacillus casei bacteria were investigated. The results of the mechanical test showed that the use of probiotic bacteria decreased the tensile strength and elongation at break of the polylactic acid-nanocellulose film (P < 0.05), but the addition of nanocellulose improved the mechanical properties of the polylactic acid film. The results of physical tests including humidity, solubility, water vapor permeability showed that the addition of probiotic bacteria and nanocellulose improved the physical properties of the film, but the opacity of the films increased (P<0.05). According to the results of the present study, with the increase in storage time, the survival of probiotic bacteria in the nanofilm decreased, and at the end of the storage period, its values were equal to 6.12 log CFU/g, but it was within the permissible range (6 log CFU/g).Therefore, the composition of Lactobacillus casei probiotic strain in the edible film can be its suitable carrier at refrigerator temperature

As a new product, nanoabsorbents play an important role in controlling and removing environmental pollution. Fe3O4 nanoparticles, due to their high absorption level, have a great ability to increase the efficiency of zeolite adsorbents in removing pollutants. Naeej et al. (2013) explained Zeolite modified with zero iron nanoparticles, due to having many absorption sites as a reducing agent, can have a great ability to remove nitrate from drinking water. Yaghmaian et al. (2015) investigated the removal of nitrate from aqueous solutions with zero-valent iron nanoparticles and stated that at a pH of 5.8 and a contact time of 55 minutes, more than 80% absorption is obtained. Qarlaqi et al. (2015) investigated the efficiency of iron oxide nanoparticles for urban sewage treatment. They stated that at pH equal to 3 and contact time of 15 minutes, the maximum amount of absorption is obtained. Therefore, in this study, clinoptilolite zeolite adsorbent and nano composite prepared from A Zeolite Fe3O4 nanoparticles were prepared in order to remove nitrate ions from real wastewater in industrial system. Also, zeolite treatment and zeolite- clay treatment were tested for comparison.

In this research, Fe3O4 nanoparticles were used to increase the efficiency of zeolite in removing nitrate from aqueous solutions and real wastewater. Laboratory columns made of PVC material with a height of one meter and a 100 mm diameter were used. The investigated columns were filled up to a height of 60 cm with the investigated materials and 20 cm of wastewater was continuously placed on the columns. The investigated treatments include three adsorbent materials: a) six kilograms of zeolite (clinoptilolite), b) three kilograms of zeolite and three kilograms of clay, and c) six kilograms of nanocomposite prepared from zeolite and nanomagnetic with an optimal ratio (Ratio of Zeolite: 0.5 Fe3O4) was laboratory. Synthetic wastewater with a concentration of 40 ppm was prepared and used. The temperature of the wastewater used was 20 degrees Celsius and the pH of the treated wastewater was measured as 7.2. The experiment was carried out factorially and in the form of a completely random basic design in three replications.

The results showed that the nano composite based on zeolite and Fe3O4 can absorb 70% of nitrate in a small laboratory scale and non-continuous flow. In continuous flow and on a large-scale laboratory that has industrial application, the absorption rate of nanocomposite will reach 27% after 8 hours of continuous flow. This absorption rate is 17% for zeolite-clay and 13.4% for zeolite. Decreasing the contact time and increasing the amount of wastewater in continuous flow will reduce the effect of absorbents. The results of the average comparison of the nitrate concentration in the wastewater from the columns with different absorbers show that the difference between the nitrate concentration in all measurement times between the nanocomposite absorber and the other two absorbers is statistically significant at the 1% level. Also, the results of one-way analysis of variance to compare the effect of wastewater removal on an industrial scale between the adsorbents used showed that the nanocomposite adsorbent used has more efficiency than zeolite and zeolite-clay adsorbents. Due to the fact that the composition of nanocomposite (zeolite modified with nano Fe3O4) has more surface area than zeolite and clay adsorbent due to having nano compounds, so the reactivity of this adsorbent is increased and nitrate absorption in this adsorbent is more than other adsorbents. In general, the results of this research show that the nanocomposite used in this study has a relative ability to remove nitrate from the water environment, and if the contact time is increased, it can be used on an industrial scale with a suitable absorption percentage. The current research was done with continuous flow and short contact time. This is despite the fact that in most of the investigated studies, the contact time was more than 50 minutes. Therefore, the amount of absorption is less than the laboratory scale and non-continuous flow. To solve this problem, the continuous flow system should be designed in such a way that the contact time reaches at least more than 50 minutes. In addition, with proper design, passing through the filter can be done in two stages so that maximum absorption takes place.

Today, the widespread use of organophosphorus insecticides such as chlorpyrifos in agriculture has caused serious environmental problems, and it seems necessary to provide a solution to eliminating these substances. Iron oxide nanoparticles are one of the types of nanoparticles that are widely used in the environment due to their good magnetic properties and ability to absorb pollutants. Nanoparticles are prepared in different ways. Recently, the use of green synthesis methods of nanoparticles using plant extracts has attracted the attention of researchers due to its compatibility with the environment. In this research project, the green synthesis of iron oxide nanoparticles in the matrix of polylactic acid nanofibers was prepared with the plant extract of Artemisia as an effective and cheap super absorbent for agricultural water treatment. Then, the effect of this adsorbent in the removal of chlorpyrifos poison and the effect of variables affecting absorption such as contact time, amount of adsorbent, temperature and pH in this process were investigated. Analysis of the structure of the composition showed that iron oxide nanoparticles are well stabilized in polylactic acid nanofibers and the average size of nanoparticles is 29 nanometers. Also, the results of the absorption test by nano adsorbent showed that the maximum amount of absorption to remove chlorpyrifos is done at pH=7 and with an amount of 0.7 grams of adsorbent, and the prepared adsorbent can be reused after 5 times of recycling. Therefore, it can be concluded that due to the presence of iron oxide nanoparticles, the nanocomposite made can increase the absorption capacity of agricultural toxins.

Among the different types of polymers used for packaging and coating, polyvinyl alcohol (PVA), given its very enviable properties, has been used in various industrial applications. It is used for instance as controlled release in pharmaceutical elements, paper, textile and food supplement coating due to its good physical properties, chemical resistance, thermostability, film-forming capability, efficiency and biodegradability. The aim of this work was to examine the combined effect of montmorillonite (MMT) platelets and titanium oxide (TiO2) spherical nanoparticles on the physical and mechanical properties of PVA/ TiO2/MMT nanocomposites, and to determine the optimal combination to provide good properties, using response surface methodology (RSM).   Materials &

PVA, PVA/TiO2, PVA/MMT and PVA/ TiO2/MMT nanocomposite films were prepared by the solution casting method. For each sample, 1.8 g of PVA was dissolved in 50 mL deionized water and maintained for 24 h at room temperature. The mixture was then heated to 90˚C and stirred using a magnetic stirrer up to 3 h to ensure the complete dissolution of PVA, followed by cooling down the solution to room temperature. Various amounts of TiO2 nanoparticles (1 and 2 w% on a dry basis) were added to deionized water and agitated with a stirrer for 12 h at 500 rpm. This method was also used for MMT (2 and 4 w% on a dry basis). The nanoparticle suspension was subjected to ultrasonic homogenization for 20 min to ensure a good dispersion. The 50 mL nanoparticle suspension was added to the PVA solution drop by drop during a period of 5 min while maintaining intense stirring (1000 rpm). Mixing was continued and glycerol (30 w% based on the polymer) was added. Vacuum with a rotary vacuum pump was applied to remove air bubbles from the solution. The solution was poured into a 15-cm internal diameter Petri dish with a perfectly flat bottom and carefully aligned horizontally. Homogeneous films were peeled off after drying in an air oven at 40˚C for 72 h. Scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) were performed for characterizing the morphology of nanocomposite films. The effect of these two nanoparticles on physical and mechanical properties, was evaluated by response surface methodology (RSM). A three-level factorial design was used to define the test points for the series of experiments. Among the various design alternatives suggested by theoretical algorithm, the selected design consisted of 13 experiments including five replicate central points used for variance calculation. Furthermore, PVA film data were analyzed using the Design-Expert program (Version 7.0, Stat-Ease Inc., Minneapolis, Minnesota) to find the optimum combination of constituents for the best properties.  

X-ray diffraction patterns showed that the nanoparticles were well dispersed in the polymer matrix of PVA/ TiO2 and PVA / MMT films with layered microstructure. In addition, the linear effect of MMT nanoparticles and the interaction of TiO2 and MMT on tensile strength were significant. The linear, quadratic and interaction effects of both nanoparticles on Young's modulus were also significant. In general, the optimum values of TiO2 and MMT were 1% and 4% respectively for mechanical properties. The presence of both nanoparticles had a significant effect on transparency and ΔE. Results of nanocomposite films indicated that the film with 2% TiO2 and 4% MMT has higher WI and actually is darker than other samples. By analyzing different results with response surface method, the nanocomposite film with 0.5% TiO2 and 4% MMT was proposed as optimum combination for mechanical and physical properties

Citrus are one of the major agricultural production available in the world and it is one of the popular fruits in the diet. The most well-known varieties of citrus fruits include oranges, lemons, grapefruits and tangerines. Cultivation of sweet lemon requires specific climate situation that it is found in many region of Iran. However, the high quality ones are in Jahrom, Ghsre Shirin, Dezfool, Jiroft and the Sorth of Iran. Two major limitation of long-term storage for citrus fruits are decay caused by pathogens, especially fungi, skin fruit damage and water loss, which can cause wrinkles and reduce product marketability and consumer acceptability. Edible coatings are one of the most effective methods to maintaining the fruit quality. Today edible coatings can preserve citrus quality and provide attractive approach to satisfactory performance. Chitosan is used for film or edible coatings to extend the shelf life of foods such as fruits, meat and fish and foods. The results of several studies indicate the effective role of chitosan in controlling fruit during storage. Wax in the fruit is used to prevent moisture loss and wrinkle of the fruit and also to maintain the appearance of the product and its marketability. So, the final goal of this study is investigate the effect of edible coatings (chitosan-clay Nano composite, Wax coatings and olive oil) on some quality attributes of sweet lemon during shelf life storage.

Sweet lemon's fruits (216 N.) were harvested randomly from a citrus orchard in Dezfool, Iran. The samples immediately sent into the laboratory for storage after necessary treatments. All fruits were disinfected by immersion in 4% chlorox for 3 minutes and then dried. Chitosan with low molecular weight (43 KD) was bought from Sigma Aldrich Company. Clay was purchased from Sefid Sang Aligoodarz Company in Iran and wax coating was provided from Pooshesh Hayat sabz company in Iran. The chitosan-clay coating was prepared by dissolving a mixture of chitosan (3w/v% to solution), clay (5, 10 and 15% wt to chitosan) and glycerol (10v/w% to chitosan) and tween 80(5% v/w to chitosan) in acid lactic solution (2%). Nano structure of chitosan-clay nano-composite was approved by XRD analysis. The chemical parameters of fruit juice such as TSS (%), pH(%) and TA (%) of lemon juice were measured. TSS was determined by digital refractometer (model MA882, made in Japan). pH was measured by pHmeter ( portable p-755 model) and TA was determined by AOAC standard method. The experiment was performed at three levels of chitosan-clay nanocomposite, olive oil, Carnoba wax and uncoated samples during 12 days shelf life storage. The experimental design was factorial based on completely randomized design with three replications. Limon samples were maintained at ambient temperature of 25 ℃ and relative humidity of 80-85%. Chemical characteristics (pH, citric acid, fruit juice TSS, vitamin C) and mechanical characteristics (weight loss percentage, sphericity coefficient, maximum shear force, maximum fracture force and maximum tensile strength of the fruit skin) were measured during storage.

The results of experiments showed that the trend of changes in vitamin C content decreased during storage. But this decrease was slower in the different percentages of chitosan-clay, olive oil coating and carnoba wax than in the control samples. The results showed the significant differences at 1% and 5% levels between different coatings at maximum fracture force, percent weight loss and pH. In addition, the effect of storage times on TSS, pH and maximum fracture force was significant. The lowest and highest percentage of weight loss for uncoated samples and olive oil coating were 12.3% and 10.23%, respectively. Results showed that the coated fruits had the better performance in preserving the quality of properties than the uncoated samples and 5% chitosan-clay nanocomposite coatings were higher performance than the other coatings.

In this study, the effect of chitosan-clay nanocomposite, olive oil, Carnoba wax and uncoated samples during 12 days shelf life storage on Chemical characteristics (pH, citric acid, fruit juice TSS, vitamin C) and mechanical characteristics (weight loss percentage, sphericity coefficient, maximum shear force, maximum fracture force and maximum tensile strength of the fruit skin) were investigated. The results of this study showed that 5% chitosan-clay nanocomposite coatings were higher performance than the other coatings.

Biodegradable magnetic nanocomposites of cellulose have been widely used in adsorption of heavy metals from water. In this research, nano magnetic papers were produced by commercial craft long fiber (NMP), magnetic fibers with 1% gluconic acid (NMP / GA 1%), nanocrystalline cellulose (MNCC) as well as carboxymethyl cellulose (MCMC), and the adsorbents were used to remove heavy metals of lead (Pb) and nickel (Ni). The nanocomposites were evaluated by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and sample vibration magnetometer (VSM). X-ray diffraction patterns showed that magnetic fibers and composites were successfully produced and the nano magnetite peaks were observed in all samples. Examination of nano magnetite and cellulose nanocrystals showed that most of the particles were in the range of 1 - 19 and 1 - 65 nm, respectively. The highest magnetic saturation was related to the nanocrystalline cellulose magnetic composite. Adsorption samples were examined by a microwave plasma atomic emission spectrometer. The results of lead and nickel adsorption test showed that the NMP / GA 1%, MCMC and control sample adsorbents had highest and lowest amount of lead and nickel adsorption, respectively. Lead metal also has a higher adsorption than nickel with all the adsorbents.

Natural polymers have gained increasing attention for the development of packaging to reduce ecologically-related problems caused by plastic packaging (environmental pollution). Among these natural polymers, proteins such as gelatin is considered a good candidate for food packaging. However, several studies have shown that gelatin films are brittle, and their hydrophilic nature connotes high water vapor permeability and water solubility. Different solutions have been suggested to overcome these weaknesses, including adding crosslinking agents and chemical modification, adding nanoparticles and developing bio-film blends and bilayers with polysaccharides. Agar is a polysaccharide extracted from marine red algae, which is biocompatible, has good mechanical properties and possesses good film-forming properties. Preventing food spoilage from light and oxygen-induced oxidation is one of the greatest concerns in the food industry. Despite having good mechanical and relatively good water vapor permeability properties, protein- or polysaccharide-based films dont have sufficient barrier properties against oxygen and UV light that cant properly prevent the oxidation of food products. Among nanoparticles, metal oxides like TiO2 (such as antiradiation and antimicrobial activities) and Montmorillonite (such as improved mechanical and barrier properties against moisture, WVP and gases) have evidenced good potential to improve functional properties of bio-films. Thus, the present study aimed to develop a new biodegradable bilayer agar/gelatin film incorporating nanoclay and TiO2 for food packaging, with maximum water sensitivity and maximum UV light and oxygen barrier properties.
Agar/gelatin bilayer films were prepared by a two-step casting technique. First, the agar layer was produced by solubilization of 1.5 g of agar powder (agar-agar analytical grade were obtained from Merck Co., Germany) in 100 mL of distilled water. Then, glycerol (obtained from Merck Co., Germany) was added as plasticizer. The agar film-forming solution was casted onto petri-dish. In the next step, the gelatin (obtained from cold water fish skin was purchased from Sigma-Aldrich, St. Louis, MO, USA) solutions were prepared by dissolving 4 g of the fish gelatin in 100 mL of distilled water. Glycerol was also added as plasticizer. The TiO2 dispersions (in ratios of 0 and 2% of the gelatin) and MMT (Na–montmorillonite (in ratios of 0, 3, 5 and 10% of the gelatin)) were added to the gelatin solution and stirred and sonnicated. Finally, produced solutions were then casted. The agar/gelatin films, with or without TiO2 and MMT, were characterized using SEM analysis. Film transparency, water vapor permeability, water solubility, swelling, surface color and mechanical properties of the bilayer films were also examined.
In this study, bilayer films based on agar and gelatin incorporated with TiO2-MMT nanoparticles have been successfully developed. Results demonstrated that some properties of the bilayer films were greatly influenced by TiO2 and MMT nanoparticle content. So that, the addition of TiO2 decreased water vapor permeability of the bilayers more than 15%, upon increasing TiO2 content to 2%. However, swelling ratio and moisture content increased with the increase in the nano-TiO2 content, probably due to the hydrophilic nature of the TiO2 nanoparticles. Also, whiteness index (WI) increased by adding 2% of TiO2 nanoparticles. As shown in the surface photograph of the bilayer films, TiO2 generated more opaque and whiter films, which might be related to the white color of TiO2 nanoparticles in solution form. Also, the addition of MMT (0, 3, 5, and 10%) to bilayer-2% TiO2 significantly decreased water vapor permeability and transmission of UV light of the bilayer films. However, tensile strength (TS) decreased with further increase of the nanoparticle concentration. Increasing the concentration of nanoparticle's MMT to 5%, the tensile TS of the agar/gelatin films increased from 12.86 to 20.54 MPa; it might also be related to the interactions between sulphydryl and carboxylic groups from certain amino acids in the gelatin structure with MMT and TiO2 nanoparticles. However, the TS decreased again with further increase of the filler content up to 10% MMT. Also, the addition of MMT from 3%-10% concentration significantly reduced the elongation at break value (EB) of the bilayer films from 41.77 to 28.90% for the bilayer films (p

Asaclimactericfruit, peach has a highrespiration rateandvery lowshelf life. Nowadays theuse ofappropriatepostharvesttechnologiesto increase fruit postharvest lifeis necessary.Use of nanotechnologyis considered asan effective method to increase fruit postharvest life. Nanotechnology isused extensivelyinallstages of production, processing, storage, packagingand transport ofagriculturalproducts.The objective of this study was to investigate the effect of silver and silica nanocomposites, nanosilver and polypropylene containers on shelf-life and preservation of peach qualitative characteristics (Prunuspersicacv. Elberta) such as titrable acidity, soluble solids, ascorbic acid, total antioxidant and total phenolics content in cold storage after the harvest.
To determine the effect of nanopackaging onshelf life andqualitativecharacteristics ofElberta peaches,the experiment was conducted in a factorial based on a completely randomized design with two treatmentsand four replications.The first factor consisted of nanopackagingnanosilver, silver and silica nanocompositesandpolypropylenepackaging, and the second factor was coldstorage periods of15, 30 and 45 daysattemperaturesfrom 0 to0/5 °C and a relative humidityof 85to 95%.In general, the experiment consisted of 36 experimental units, and each includinga container with four Elberta peach fruits.Data were analyzed by using SAS software, and Microsoft Office Excel 2010 software was used to plot the graphs.Duncan's multiple range test was used to compare the means of treatments.
At the end of the maintenance period, the highest firmness of peach texture was related to nanosilver containers. The main cause of fruit softening is the destruction of cell wall components, especially pectin, which is caused by certain enzymes such as polygalactronase. Whenstorage timeincreased, polypropylene containers showed a higher weight loss compared to nanocomposite containers, thus the results indicated that nanopackaging had a greater effect on preventing weight loss, which could be attributed to the formation of better barrier against water molecules. Nanoparticles and polypropylene containers up to 30-daystorage period preserved the pH of the product to some extent and prevented it from increasing too much. However, with an increase in storage time from 30 to 45 days, the pH of all dishes showed sharpincrease. In most treatments, fruits grew during the maintenance period, which is due to the reduction of organic acids. The lowest levels of organic acids reduction were recorded in polypropylene and nanosilver treatments. Generally, organic acids decreased as a result of respiration or becoming sugars, whichcan bedirectly related to metabolic activity. Maintaining organic acids in fruits is the result of a slowdown in the processes of ripeningand aging and reduction inrespiration and other metabolic activities. The results showed that in all the three treatments, the amount of soluble solids up to 15-day periodshowed an increasing trend, and after the end of day 30, it stopped in nanosilver and polypropylene treatments, and soluble solids were retained but reduced in nanocomposite treatment showed that this decrease. Nanocomposite containers exhibited the best performance in maintaining ascorbic acid content and preventing its changes, while ascorbic acid content in nanosilver and polypropylene containers varied greatly, thoughthere were no significant differences among thetreatments. Low oxygen environments, such as packaging containers, can inhibit ascorbic acid changes during maintenance by inhibiting oxidation. The results showed that total antioxidant level was almost identical in all treatments at the end of maintenance. Antioxidant activity has a close relationship with phenolic compounds, flavonoids and vitamins. The antioxidant capacity of fruits and vegetables is related to enzymatic and non-enzymatic compounds such as vitamin C, phenolic compounds, and carotenoids. Treatments reducingrespiration and producingethylene can reduce the rate of aging,the rate of free radical production and the consumption of antioxidants. Based on the results, on the day 30 in all treatments, the amount of phenolic compounds initiallyincreased, which is normal in red fruits, but afterwards decreased in all treatments mainly due to the increased activity of the polyphenol oxidase enzyme and the progression of aging. Increasing the amount of phenol on the day 30 can be attributed to decreased activity of the polyphenol oxidase enzyme and the oxidative stress associated with high concentrations of oxygen.
Nanopackaging increased the shelf life and qualitative properties of peach fruit. Nanotechnology has a simple and fast process for industrialization compared to other methods of keeping food products. As a result, the use of modern technologies such as nanopackaging can improve the taste, favor, quality of food and the storage of crops, especially fruits and vegetables.

It is important to increase storage quality of orange by using of natural coatings. In this research, quality of Thomson oranges coated with chitosan-clay nano composite edible coating and fogger - wax (fog production from Ortho Phenil Phenol by electro fogger with nano dimension) was compared with the sample without coating during storage. Orange quality properties were evaluated during storage for 3 months in a cold storage at 6oC temperature and 85-90% relative humidity. Results showed that fruits coated with chitosan-clay had highest pH, chroma, peel moisture and firmness compared to the other samples. Therefore, this nano coating increased fruit resistance to fungal diseases, retained peel fruit color and inner texture strength during storage. Amount of total soluble solid and acid total of fruit juice for fogger - wax coating decreased and increased during storage, which this trend could indicate fermentation phenomenon in the fruit. So using of chitosan-clay nano composite edible coating can be offered for prevention of decrease fruit quality during storage.

In recent years, there has been a lot of attention in producing and using of renewable and environmental friendly cellulose film and coverage. Regarding to the application of these films and coverages in different industries such as food, packaging and medical industries, their antimicrobial property is apparent. The purpose of this research is producing cellulose antibacterial film. At first, long fibr pulp convert to NFC using a supergrinder and then nanosilver treated films prepared applying silver nitrate through two different ways. In the first method, silver nanoparticles with considerations of 5 and 10 ppm reduced on NFC particles’ surface using retention aid. In second methods the prepared NFC film has been immersed in solution of Ag nanoparticle in concentration levels of 5 and 10 ppm. On higher concentration of used nanosilver solution, the amount of retained Ag nanoparticle in the first method was higher than the second one whereas, on lower concentration one, the differences of retained nanosilver values between two methods was a little. It has worth of mentioning that immerging method has the benefit of avoiding Ag nanoparticle wasting during pulp draining and nanosilver solutions could be reused simply.

Three coatings، Carnoba wax، Chitosan and naocomposite، were used to prevent postharvest losses of Golden Delicious apple. The effect of three coatings was compared with uncoated samples on quality and physical properties of apples during storage. These properties were pH، soluble solids (TSS)، color intensity (a، b، L and E coefficients) and density. The variations of quality properties of apples during six months at two conditions of cold storage (2 °C and 95% RH) and environmental storage (20 °C and 45% RH) were evaluated. The results showed that pH، brix and color intensity for three coatings had an ascending trend but density and L had a descending trend in environmental condition. In the environmental condition، the highest color intensity losses were found for the without coating samples and the lowest losses for the wax coating samples. In opposite، color intensity for the wax coating samples had lowest losses. There was no more change in brix trend for nanocomposite coating.

In recent years using fresh foods that have undergone minimal processing، has become widespread. The use of active packaging is a new method for preserving of these products. In this study، active starch-clay nanocomposite films with addition of cinnamon essential oil or potassium sorbate (0، 5، 7. 5 and 10% on the base of dry starch) were prepared. The physical، mechanical and antimicrobial properties of the active films were evaluated. For the evaluation of antimicrobial properties of the films، Aspergillus niger was used as one of the important spoilage fungi of bread. The results showed that 5% of the antimicrobial additives didn’t any antimicrobial activity. However، by increasing the concentration of the additives، antimicrobial activity also increased. In the same amounts of both additives، the films which contained cinnamon essential oil had stronger antimicrobial effects. The addition of potassium sorbate increased water vapor permeability of the films. However، cinnamon essential oil، didn’t affect this property of the films. These results showed that the films could be used as an active food packaging.