In this study, exogenous pre-harvest treatment of tomato plants with MeJA （Methyl Jasmonate） and chitosan was used to elicit lycopene biosynthesis and stimulate plant growth. Lycopene is a bright red carotene and ca...In this study, exogenous pre-harvest treatment of tomato plants with MeJA （Methyl Jasmonate） and chitosan was used to elicit lycopene biosynthesis and stimulate plant growth. Lycopene is a bright red carotene and carotenoid pigment found in tomatoes, carrots and other red fruits and vegetables. It is a powerful antioxidant that protects cells from damage and blocks cancerous cell growth. Many studies suggest eating lycopene-rich foods may be directly linked to reducing risk of several cancers, heart disease and stroke, hence there is a need to enhance its levels in tomatoes. Tomato seeds were soaked in MeJA and chitosan solutions of varying concentrations and then planted. The resulting plants were irrigated with the solutions used to soak the seeds, accordingly. The heights of the plants were recorded on a tri-weekly basis and HPLC （High Performance Liquid Chromatography） was used to analyze the effects of the MeJA and chitosan solutions on lycopene yields in the tomato fruits. Analysis of chromatograms obtained from tomato samples in the MeJA and chitosan-treated groups showed enhanced levels of lycopene. Plant growth was not significantly affected by treatment ofMeJA. Chitosan, however, noticeably increased plant growth over 7 weeks.展开更多
Nitro and halogen substituted derivatives of the juglone naphthoquinone were synthesized and assayed for their antibacterial activity. 8-Nitrojuglone was obtained as the exclusive product from the direct nitration of ...Nitro and halogen substituted derivatives of the juglone naphthoquinone were synthesized and assayed for their antibacterial activity. 8-Nitrojuglone was obtained as the exclusive product from the direct nitration of juglone with nickel （Ⅱ） nitrate and p-toluenesulphonic acid. In addition, a series of five 8-halojuglone derivatives were synthesized via a solvent-free Friedel-Crafts acylation reaction. One of the acylation reactions afforded an anthraquinone-type derivative as the minor product. The 8-nitrojuglone derivative displayed the most notable activity against S. aureus. However, all of the 8-halojuglone derivatives were found to be less active than juglone against the bacteria assayed.展开更多
Antioxidant efficiency was studied in fresh edible algae： Cladophora, Microspara and Nostochopsis spp. from Nan River, Nan province. The samples were collected from Pua and Tha-Wang-Pha district, studied antioxidant ...Antioxidant efficiency was studied in fresh edible algae： Cladophora, Microspara and Nostochopsis spp. from Nan River, Nan province. The samples were collected from Pua and Tha-Wang-Pha district, studied antioxidant activity and compared the antioxidant efficacy of the extracts from the three fresh edible algae with a standard solution, 3-tert-butyl-4-hydroxyanisole （BHA）. This study found that an extract ofNostochopsis spp. was the highest antioxidant activity to DPPH free radical between 32.1 and 87.5, the highest amount of beta-carotene was 4.71-7.09 mg/g and the highest amount of phenol in fresh edible algae extracts from Microspora was between 9.37 and 37.02 mg/g. The highest vitamin C in Microspora was between 110.41-138.53 mg/100 g.展开更多
It was found out that spices straight from the package are not sterile. The only way to receive sterile spices is to use radiation technology which means to irradiate spices with ionizing radiation. However, this meth...It was found out that spices straight from the package are not sterile. The only way to receive sterile spices is to use radiation technology which means to irradiate spices with ionizing radiation. However, this method is quite expensive and raises great resistance of public. And this is the reason why we are interested in implementing plasma technology. The first step of the research was to choose the most appropriate spice. The range of available spices is nearly unlimited, however, we took into account the following ones： sweet paprika, basil, rosemary, saffron, marjoram, thyme and black pepper. Finally, we chose black pepper because it is most often used by butchers to make meat products. It is also called the ＂King of Spices＂ or the ＂Black Gold＂. Black pepper is one of the most often used spices in the United States and in Europe. It is important to have sterile black pepper when we aim at ripening products for example ripening sausages or some kinds of cheeses. What is more, it was found out that black pepper has antimicrobial properties, antioxidant effects and also antipyretic and analgesic properties. The aim of the research was to receive sterile spices using low pressure cold plasma with oxygen, nitrogen, air, argon and hydrogen peroxide.展开更多
Carrot （Daucus carom） is a valuable source of health promoting ingredients such as anthocyanin, carotenes, phenolic compounds etc. These substances are important to man as a source of pharmaceuticals, fragrance, agr...Carrot （Daucus carom） is a valuable source of health promoting ingredients such as anthocyanin, carotenes, phenolic compounds etc. These substances are important to man as a source of pharmaceuticals, fragrance, agrochemicals as well as food additives and used for prevention of many chronic diseases. Since these activities may be correlated with the presence of antioxidant compounds, extract of carrot and carrot callus were evaluated for their anthocyanin, flavonoids and total phenolic content as well as total antioxidant activity. Anthocyanin content was measured by spectrophotometric method. Total phenols and flavonoids were analyzed according to the Folin-Ciocalteu method and total antioxidant activity was assessed by ferric reducing/antioxidant power （FRAP） assay. Anthocyanin, flavonoids and total phenolic content were estimated to be 9.36 mg%, 46.96 mg% and 57.01 mg% for callus and 6.82 mg%, 32.96 mg% and 42.69 mg% for carrot, respectively, on fresh weight basis. The total antioxidant activity for the callus and carrot was found to be 51.13 mg, 118.77 mg, 91.08 mg and 140.08 mg equivalent and 79.40 mg, 184.44 mg, 141.43 mg and 217.52 mg equivalent to gallic acid, vitamin C, butylated hydroxyanisole （BHA） and trolox, respectively, when expressed per 100 g on fresh weight basis. The antioxidant activity of fresh carrot was found to be higher compared to its callus.展开更多
Hydrilla verticillata （I.f.） Royle twigs were exposed to CdCI2 （50, 100, 200 and 500 BM） under continuous light for 48 hrs and the physiological parameters like photosynthetic pigment （chlorophylls a, b and carot...Hydrilla verticillata （I.f.） Royle twigs were exposed to CdCI2 （50, 100, 200 and 500 BM） under continuous light for 48 hrs and the physiological parameters like photosynthetic pigment （chlorophylls a, b and carotenoids） contents, activities of antioxidative enzymes like superoxide dismutase （SOD）, catalase （CAT） and peroxidase （POX） along with lipid peroxidation level were determined. With respect to increase in Cd concentration in the medium and exposure duration, decrease in pigment contents, and decrease in the activities of SOD, CAT and POX were found. The increased levels of lipid peroxidation indicated the prevalence of oxidative stress situation in the tissues which might be one of the reasons behind Cd induced toxicity in Hydrilla verticillata. Since there was significant decrease in the activities of key antioxidative ezymes, the study suggests that Hydrilla verticillata may not be effective for phytoremediation of cadmium in these concentration ranges.展开更多
文摘In this study, exogenous pre-harvest treatment of tomato plants with MeJA （Methyl Jasmonate） and chitosan was used to elicit lycopene biosynthesis and stimulate plant growth. Lycopene is a bright red carotene and carotenoid pigment found in tomatoes, carrots and other red fruits and vegetables. It is a powerful antioxidant that protects cells from damage and blocks cancerous cell growth. Many studies suggest eating lycopene-rich foods may be directly linked to reducing risk of several cancers, heart disease and stroke, hence there is a need to enhance its levels in tomatoes. Tomato seeds were soaked in MeJA and chitosan solutions of varying concentrations and then planted. The resulting plants were irrigated with the solutions used to soak the seeds, accordingly. The heights of the plants were recorded on a tri-weekly basis and HPLC （High Performance Liquid Chromatography） was used to analyze the effects of the MeJA and chitosan solutions on lycopene yields in the tomato fruits. Analysis of chromatograms obtained from tomato samples in the MeJA and chitosan-treated groups showed enhanced levels of lycopene. Plant growth was not significantly affected by treatment ofMeJA. Chitosan, however, noticeably increased plant growth over 7 weeks.
文摘Nitro and halogen substituted derivatives of the juglone naphthoquinone were synthesized and assayed for their antibacterial activity. 8-Nitrojuglone was obtained as the exclusive product from the direct nitration of juglone with nickel （Ⅱ） nitrate and p-toluenesulphonic acid. In addition, a series of five 8-halojuglone derivatives were synthesized via a solvent-free Friedel-Crafts acylation reaction. One of the acylation reactions afforded an anthraquinone-type derivative as the minor product. The 8-nitrojuglone derivative displayed the most notable activity against S. aureus. However, all of the 8-halojuglone derivatives were found to be less active than juglone against the bacteria assayed.
文摘Antioxidant efficiency was studied in fresh edible algae： Cladophora, Microspara and Nostochopsis spp. from Nan River, Nan province. The samples were collected from Pua and Tha-Wang-Pha district, studied antioxidant activity and compared the antioxidant efficacy of the extracts from the three fresh edible algae with a standard solution, 3-tert-butyl-4-hydroxyanisole （BHA）. This study found that an extract ofNostochopsis spp. was the highest antioxidant activity to DPPH free radical between 32.1 and 87.5, the highest amount of beta-carotene was 4.71-7.09 mg/g and the highest amount of phenol in fresh edible algae extracts from Microspora was between 9.37 and 37.02 mg/g. The highest vitamin C in Microspora was between 110.41-138.53 mg/100 g.
文摘It was found out that spices straight from the package are not sterile. The only way to receive sterile spices is to use radiation technology which means to irradiate spices with ionizing radiation. However, this method is quite expensive and raises great resistance of public. And this is the reason why we are interested in implementing plasma technology. The first step of the research was to choose the most appropriate spice. The range of available spices is nearly unlimited, however, we took into account the following ones： sweet paprika, basil, rosemary, saffron, marjoram, thyme and black pepper. Finally, we chose black pepper because it is most often used by butchers to make meat products. It is also called the ＂King of Spices＂ or the ＂Black Gold＂. Black pepper is one of the most often used spices in the United States and in Europe. It is important to have sterile black pepper when we aim at ripening products for example ripening sausages or some kinds of cheeses. What is more, it was found out that black pepper has antimicrobial properties, antioxidant effects and also antipyretic and analgesic properties. The aim of the research was to receive sterile spices using low pressure cold plasma with oxygen, nitrogen, air, argon and hydrogen peroxide.
文摘Carrot （Daucus carom） is a valuable source of health promoting ingredients such as anthocyanin, carotenes, phenolic compounds etc. These substances are important to man as a source of pharmaceuticals, fragrance, agrochemicals as well as food additives and used for prevention of many chronic diseases. Since these activities may be correlated with the presence of antioxidant compounds, extract of carrot and carrot callus were evaluated for their anthocyanin, flavonoids and total phenolic content as well as total antioxidant activity. Anthocyanin content was measured by spectrophotometric method. Total phenols and flavonoids were analyzed according to the Folin-Ciocalteu method and total antioxidant activity was assessed by ferric reducing/antioxidant power （FRAP） assay. Anthocyanin, flavonoids and total phenolic content were estimated to be 9.36 mg%, 46.96 mg% and 57.01 mg% for callus and 6.82 mg%, 32.96 mg% and 42.69 mg% for carrot, respectively, on fresh weight basis. The total antioxidant activity for the callus and carrot was found to be 51.13 mg, 118.77 mg, 91.08 mg and 140.08 mg equivalent and 79.40 mg, 184.44 mg, 141.43 mg and 217.52 mg equivalent to gallic acid, vitamin C, butylated hydroxyanisole （BHA） and trolox, respectively, when expressed per 100 g on fresh weight basis. The antioxidant activity of fresh carrot was found to be higher compared to its callus.
文摘Hydrilla verticillata （I.f.） Royle twigs were exposed to CdCI2 （50, 100, 200 and 500 BM） under continuous light for 48 hrs and the physiological parameters like photosynthetic pigment （chlorophylls a, b and carotenoids） contents, activities of antioxidative enzymes like superoxide dismutase （SOD）, catalase （CAT） and peroxidase （POX） along with lipid peroxidation level were determined. With respect to increase in Cd concentration in the medium and exposure duration, decrease in pigment contents, and decrease in the activities of SOD, CAT and POX were found. The increased levels of lipid peroxidation indicated the prevalence of oxidative stress situation in the tissues which might be one of the reasons behind Cd induced toxicity in Hydrilla verticillata. Since there was significant decrease in the activities of key antioxidative ezymes, the study suggests that Hydrilla verticillata may not be effective for phytoremediation of cadmium in these concentration ranges.
