جستجوی مقالات مرتبط با کلیدواژه "اسانس ها" در نشریات گروه "بیوتکنولوژی و ژنتیک گیاهی"

 The effect of different concentrations of three types of gas mixtures (carbon dioxide, nitrogen),as well as vacuum and ordinary condition and ginger and cinnamon essential oils were evaluated to prolong shelf life of of creamy donut at ambient (25ºC) in one 4-layer container (119 μ).

 Ordinary packaging, as control samples were compared with four type of modified atmosphere packaging 1) 80% CO2 + 20% N2; 2) 20% CO2 + 80% N2;3) 50% CO2 + 50% N2, and 4) under vacuum condition along with injection ginger and cinnamon essential oils and samples without essential oils. Experiments were performed on samples as follows microbial test (aerobics count, mold and yeast count ),‌‌chemical pH test, amount of dripped water and sensory evaluation during 20 days.

 The shelf life, of creamy donut samples were reported with ginger essential oil under gas compositions, 80% CO2; 50% CO2 & 20% CO2 20, 19, 16 days in vacuum and ordinary conditions were 13, 11 days respectively, with cinnamon essential oil under different modified atmospheres, vacuum and ordinary conditions were 18, 16, 14, 11,‌‌ 9 days, without essential oil injection, under gas compounds above and vacuum and ordinary conditions were 15, 13, 11, 9, 6 days respectively.

 The best condition belonged to samples containing ginger essential oil under conditions 80% CO2 till 20 days, which had desirable effects on microbial population (aerobics bacteria "4.82 logcfu/ml", mold & yeast "2.56 logcfu/ml"), amounts of pH (5.49), dripped water (%0.61) and also sensory properties of samples.

Plants extracts can be a new sources for pest and disease controlling. In this research, the antibacterial effects of essential oil from 9 plants including, Juncus, Euonymus japonicas, Taxus baccata, Dana racemose, Datura stramonium, Lythrum Salicaria, Cupressus sempervirens, Ilex aquifolium and Hyssopus officinalis with different concentrations, means 12.5, 25, 50 and 100 % used for three bacteria such as E.coli, Pseudomonas syringae. pv syringae, Rathayibacter tritici through in the form of disc diffusion. The experimental was as completely randomized factorial design with three replications. At the end, qualitative and quantitative analysis of the components of the essential oil were analyzed by GC-MS. The results of variance analysis of the inhibitory effects in different concentrations showed that, plant species, the different concentrations of essential oil, the type of bacteria and mutual interaction have shown the significantly meaning, in terms of inhibitory effects (P <0.01). The results indicated, the most antimicrobial activities related to the Juncus essential oil with the zone of 13.3 mm for E.coli. The part of Juncus essential oil so examined by GC-MS system and the result has shown 14 different compounds. The maximum and minimum substances were Menthol (41%), Menthone (12%) and Pulegone (8.62%), respectively. From this research, we conducted that the juncus.s essential oil putatively can be as a source of disease control agent.

Because the role of essential oils and aromatic substances in plants is lost due to chemical evaporation or chemical instability over time, Many methods have been used to increase the stability and durability of essential oils, and encapsulation is one of the most important ones. In this study, micro or nanocapsules containing mint essential oil were prepared by coacervation and freeze drying methods using various polymers such as sodium alginate, starch and malto dextrin. Initially, with different weighing of each of the polymers, solutions were prepared with deionized water to achieve the best concentration. The ultrasound homogenizer was then used to homogenize, and the mint essence was gradually added to the homogeneous solution. The capsules were prepared immediately after preparing homogeneous polymer and essential oil mixtures. After that, the capsules were evaluated by scanning electron microscopy(SEM). The type of polymer, polymer concentration and mixing speed are among the factors affecting the type of capsule and how the mint essence is released.

The term "cryopreservation" refers to the storage of cells, organs, and tissues in liquid nitrogen ( 196 ° C). At this temperature, the physical and biochemical reactions of cells are virtually stopped; in these particular circumstances, the time of protection is unlimited. Storage of seeds is arguably the most efficient method for the ex situ preservation of plant genetic resources. Low storage costs and regeneration of whole plants from genetically diverse material, offer distinct advantages for the storage for conservation of seeds compared with other types of plant tissues.

In order to preserve seeds of Foeniculum vulgare(Apiaceae) medicinal plant, in cryopreservation condition, we used Desiccation pre-treatment for seeds. After a week seeds of treatment were extracted from the liquid Nitrogen and were melted in Ben Murray with 42°C. Then treatment and control seeds were transferred to a germinator in 24°C and 16/8H optical period.The seeds were distillated by Clevenger apparatus and the essential oils obtained were analyzed by GC/MS. The antioxidant activity determined by DPPH method.

The percent of viability of the control seeds (83%) was observed in comparison to the treated (53%). The major component of essential oil was anethole (80.04%) comparing the control (78.6%). No adverse effects were observed on the antioxidant properties and their essential oils.

Cloves an important plant source of phenolic compounds, antioxidant, anti-cancer, anti-inflammatory, which has long been used. According to the importance of extracts and essential oils and the importance of them in various industries due to their unique characteristics, the extract and the essential oil of clove plant were extracted and subjected to chemical analysis to identify and evaluate the chemical constituents of them. Extract was isolated by maseratoin method and isolation of essential oil was done by celevenger. Extract and essential oil were analyzed by gas chromatography in coupled with mass spectrometry (GC / MS). Eight compounds were identified in the clove extract that its main components were eugenol (85.5%), eugenol acetate (2.3%) and heptacosone (1.8%), respectively. Seven chemical compounds were identified in the clove oil which the main ones including eugenol (86.36%) and beta-cariophilic (7.66%). Eugenol was the main combination in both the extract and the essential oils and showed the highest concentration of this compound among them.

Strawberry fruit is popular with customers all over the world, and many factors causing the less of the early and reduce its storage life. In this study, the effect of the concentrations 0- 100- 200- 300 µl/l of T. vulgaris and T. kotschyanus and CaCl2 solution concentrations 0- 100- 200- 300 mg/L was tested on some characteristics of postharvest strawberry fruit. Traits include the amount of TSS, ascorbic acid, anthocyanin, soluble sugars, activity of PPO and GR enzyme. The results showed that 300µl/L of T. vulgaris compared to other treatments of TSS, ascorbic acid, anthocyanin, soluble sugars have significant effects on the level of 5%, and concentration of 200 µl/l T. kotschyanus compared to the other treatments reduced activity of PPO enzyme and increased of activity of GR enzyme and had a significant effect on the level of 5%. Concentration of 300 µl/l T. vulgaris compared with the other concentrations improve the traits measured. Since different active ingredients and essential oils due to its antifungal properties to reduce corruption and increase the storage life of the strawberry crop. The result can increase the shelf life of fruits compared to control fruits.

In order to investigate the antifungal effect of fennel and savory essential oil on golden delicious apple’s postharvest life and reduction of decay, this experiment was conducted in complete randomized design (CRD) with seven treatments and four replications. The treatments included: control (fruits inoculated with Pencillium fungi without any treatments), and 3-5 minute dipping in medicinal plant essential oil (Fennel and Summer savory) at the concentrations of 400, 800, and 1200 mg/lit. Treated fruits were stored under cold storage for 3 month. The analyzed factors included: decay and weigh loss percentages, total soluble solid (TSS), juice pH, total acid (TA), TSS/TA ratio, decreasing percent of total acid, and increasing percent of TSS and pH. The results indicated that the minimum percentage of weight loss, the highest value of TSS and TSS/TA ratio were in treatment with Fennel essential oil (800 mg/lit). The percentage of decay in treatments with the essence of both plants was significantly less than the control. The amount of TSS increased during the storage period. Although the percentage of medicinal plants increased, the amount of decay and TSS reduced while the percentage of weight loss increased. The maximum amount of TSS/TA ratio was respectively observed in Fennel essential oil (800 and 1200 mg/lit).

Candidal vulvovaginitis occurs in female genital by the over growth of candida especially candida albicans. Noticing the daily increase of drug resistance, attempts should be made for providing anti-fungal and anti-microbial drugs. This study is to determine the comparison of concentration in-vitro effects of Zataria multiflora Boiss and Mentha pulegium Essential Oil plants Composition with one of them Nystatin on Candida albicans Isolates of Vaginal Candidiasis and comparing their with standard.

This experimental study assessed the antimicrobial effect of 2 plant extracts on Candida Albicans. Zataria multiflora Boiss and Mentha pulegium were selected based on previous researches and traditional usel. On each plate, one plant extract disc, one nystatin disc (aspositive control) and one blank disc (as negative controls) were placed. The mean diameter of non-growth halo around each plant extract was compared with the mean diameter of non-growth halo of positive control discs after 24 hours.Data analysis was done by ANOVA statistical test.

There was significant different between the diameter of non-growth halo around the plant extracts and nystation discs. (p<0.05).

Zataria multiflora Boiss and Mentha pulegium exhibited antifungal effects on C. Albincans But the effect of Mentha pulegium on the lack of growth of Candida Albicans strains was greater than that in Zataria multiflora Boiss.