Organic Foods Pdf Essay Example for Free

Organic Foods Pdf EssayAbstract During the last decade, consumers trust in food lineament has change magnitude drastically, mainly because of growing ecological aw arness and several food s lowlifedals (e. g. BSE, dioxins, bacterial taint). It has been found that intensive courtly agriculture spate introduce contaminants into the food chain. Consumers view started to look for safer and split up controlled foods bring outd in more environmentally couthy, authentic and local systems. Organically produced foods argon widely believed to satisfy the above demands, leading to lower environmental impacts and high(prenominal) nutrient values. So far, studies select partly con? rmed this opinion. Organic casts contain fewer nitrates, nitrites and pesticide residues only when, as a rule, more dry matter, vitamin C, phenolic compounds, inhering amino acids and total profitss than established crops. Organic crops overly contain statistically more mineral compounds and usua lly have remediate sensory and long-term storehouse qualities. However, there are also round negatives deedss cultivated in positive systems generally have 20% lower yields than accomplishedly produced crops.Several important problems indispensableness to be addressed in the coming years environmental, bacterial and fungal contamination of innate crops and, the nigh essential issue, the impact of constitutive(a) food economic consumption on animal and homo wellness. 2007 Society of Chemical Industry Keywords ingrained plant crops quality yield composition nutrition vitamins phenolics sugars nitrates nitrites pesticides dry matter health sensory qualities.FACTORS INFLUENCING THE QUALITY OF ORGANIC PLANT FOOD PRODUCTS There are several important factors in?uencing the quality of food products that also are applicable to constituent(a) fertiliserally produced plant products. As illustrated in Fig. 1, the basic factors are the quality of the environment (abiotic fact ors) and the levels of pest and pathogen damage (biotic factors) to which plants are exposeded.The main components of the environment (air, water, soil) have to be unpolluted if the crops obtained are expected to be of high nutritive quality. Many environmental contaminants enter the food production chain (soilplantanimalhuman organism), causing signi? cant problems in human health.1 These contaminants include sullen metals, pesticide residues, northward compounds, mycotoxins, chlorinated biphenyls (PCBs), aromatic hydrocarbons (e. g. benzoapyrene), plant growth stimulators (e. g. choline chloride), antibiotics, hormones, radioactive isotopes and plastic substances (monomers). Climate and tolerate are also important factors, as well as soil type and pH, soil cultivation, fertilisation and conditions of crop storage after harvest. ? Biotic factors can have also a signi? cant impact on crop quality. The main biotic factors are cultivar choice, bacterial and fungal contamination (di sease) and pest damage.Cultivars of the comparable crop species can differ signi? cantly in nutritive quality. For example, the content of ? carotene in carrots (Daucus carota L. ) can vary between 7. 19 and 13. 84 mg g? 1 depending on the cultivar. 2 The main potential source of bacterial contamination in plant crops is animal manure utilize in organic farming. Contamination can take place via the roots or by water splashing onto the leaf surfaces. The most important organisms are several species of facultative anaerobic bacteria (Salmonella enterica, Escherichia coli O157H7, Campylobacter spp., Listeria monocytogenes, Clostridium botulinum, Mycobacterium paratuberculosis), protozoa (Toxoplasma gondii), tapeworms, viruses and prions.The results obtained so far are contradictory. some(a) studies channelize higher(prenominal) bacterial contamination in organic crops, while other(a)s show the opposite. 3 Mycotoxins (produced by fungi) originate by and large in the ? eld but can a lso develop during storage. Owing to the fact that fungicides are not used Correspondence to Ewa Rembialkowska, Organic Foodstuffs Division, Faculty of Human Nutrition and Consumer Sciences, Warsaw Agricultural University, Nowoursynowska 159 C, PL-02-776 Warszawa, Poland E-mail ewa emailprotected pl (Received 24 October 2006 revised version received 29 January 2007 accepted 8 February 2007).Figure 1. Factors in? uencing the quality of organic food products. in organic agriculture, some authors believe that organically produced foods will contain higher concentrations of mycotoxins. However, literature reviews show that mycotoxin concentrations are usually similar or reduced in organic compared with effected products. 4 The most notorious mycotoxins are those produced by Fusarium species on cereal crops and maize.One of the reasons for lower Fusarium infections in organic grains could be the lower nitrogen concentrations in the tissues. 5 Insect pests also exert an in? uence on crop quality. Because of the ban on synthetic pesticides in organic agriculture, insects much damage fruits and vegetables, thereby diminishing their yield and harming their appearance. However, it is not clear whether they also reduce their nutritive quality. In contrast, there is severalise that organically grown plants contain more phytochemicals (which are natural insecticides) and are therefore more yucky to insect damage.6 They can also play a positive role in human health, because several phytochemicals, being plant defence compounds, are connected with possible health bene? ts (Brandt K, oral presentation at QLIF Congress, Newcastle, 2005). Regulations on organic plant production allow actions that avoid some negative features of crop quality if they are consistently performed by producers. In order to ful? l these demands and to offer highquality products to consumers, an ef? cient and airtight certi? cation and control system must be implemented.In most countries such sys tems are quite ef?cient, though a rapid increase in the number of organic farms could lead to problems with a subsequent loosening of regulatory control. because the main rule should be trust is good, but control is better. Moreover, the ? nal quality of organic food products is in? uenced by the effective death penalty of 2758 the regulations on animal production and organic food processing. Only precise ful? lment of all these regulations can guarantee the best organic food quality (Fig. 1). pretend OF REGULATION ON ORGANIC PLANT PRODUCTION The regulations for organic plant production are clear and detailed.7 The European Union (EU) regulation make in 19918 contains parts that relate directly to the composition of organic plant products. The most important aspects of this regulation include7 a ban on genetic engineering and genetically modi? ed organisms (GMOs) lower nitrogen levels a maximum limit for manure application of 170 kg N ha? 1 year? 1 a ban on synthetic pestic ides a ban on synthetic mineral fertilisers a ban on growth promoters. Organic farmers must follow the above regulations if they want to pass the inspection procedure every year and receive a certi? cation document.If all requirements are complied with, several qualitative results can be expected. The most important conclusions from scienti? c comparisons are given below. CONTAMINANTS Nitrates and nitrites A large join of data shows that the content of nitrates and nitrites is distinctly higher in conventionally cultivated than in organic crops. This is important, because nitrates can easily be converted into nitrites, which can cause a dangerous disorder called methaemoglobinaemia in babies, infants and elderly people. 9 J Sci Food Agric 8727572762 (2007) DOI 10. degree Celsius2/jsfa theatrical role of organic plant products.Moreover, nitrites can react with amines to create nitrosamines, which are carcinogenic and mutagenic substances causing cancer of the digestive tract a nd leukaemia. 10 This process is dangerous not only for young children but also for adults of any age. found on a large amount of data, the nitrate content of organic and conventional crops has been compared. On average, the nitrate content of organic crops was 49% that of conventional crops. 11 These and other data provide a basis for stating that organic methods lead to an approximately 50% reduction in the intake of nitrates and nitrites by humans.Pesticides Governments place level-headed limits, cognize as the Maximum Residue Level (MRL), on the level of pesticides that can be present in food. The MRL is usually estimated by testing soulfulness pesticides on rats. Governments proceed that consumption of pesticides below the MRL is not a health risk. However, at lower levels, pesticides are known or suspected to cause many diseases and health problems, including cancer. 12 The main problem is that the MRL for pesticides is usually estimated by testing individual pesticides o n rats for a relatively short period.Virtually nothing is known about the effects of consuming combinations of potentially hundreds of different pesticides over the course of a lifetime. We do not and cannot know explicitly what is causing what, so charge is the main tool available to us (Howard V, oral presentation at QLIF Congress, Newcastle, 2005). The levels of pesticide residues found in organic crops are de? nitely lower than those present in conventional crops (Howard V, oral presentation at QLIF Congress, Newcastle, 2005). It can be expected that eating organic foods will result in lower pesticide levels in human milk and body tissues.There is some license con? rming this possibility. Researchers in France found that the level of pesticide residues in the milk of breast-feeding women decreased signi? cantly with an increase in the proportion of organic food in the daily diet (from 25 to 80%). 13 All available results show that the content of pesticide residues is signi? c antly lower in organic crops, which creates safer health conditions for consumers eating organically. Heavy metals Heavy metals such as cadmium, lead, arsenic, mercury and zinc are introduced into the food chain from various sources, including industry, transportation, communal wastes and agriculture.For example, mineral phosphoric fertilisers used in conventional agriculture can introduce cadmium into crops, but the metal industry and transportation also cause cadmium contamination of soils and crops. indeed there are no clear results in studies comparing the levels of J Sci Food Agric 8727572762 (2007) DOI 10. 1002/jsfa heavy metals in organic and conventional crops. Some data point to higher levels in conventional crops, while others show the opposite. 11 A problem to be solved is whether organic farming (composting, change magnitude the organic matter in soil, pH, etc. ) can diminish the intake of heavy metals by cultivated plants.DESIRABLE COMPOUNDS IN PLANTS Vitamins, phenol ic compounds and mineral compounds The nutritive value of foods depends mainly on them having the appropriate content of compounds indispensable for proper functioning of the human organism. The content of phyto-compounds in plant foods is a topic of smashing interest in food science nowadays. A growing body of evidence indicates that secondary plant metabolites (phytochemicals) play a critical role in human health and may be nutritionally important. 14 There are two main theories explaining the factors in? uencing the levels of compounds in plants.15 The carbon/nitrogen (C/N) balance theory states that, when nitrogen is easily available, the plant will ? rst make compounds with high nitrogen content, e. g. proteins for growth and nitrogen-containing secondary metabolites such as alkaloids, glucosinolates and non-protein amino acids such as the Allium ? avour precursors. When nitrogen availability is limiting for growth, the metabolism changes more towards carboncontaining compound s, e. g. starch, cellulose and non-nitrogen-containing secondary metabolites such as phenolics and terpenoids. The second, newer theory is the growth/ differentiation balance hypothesis (GDBH).15 It states that the plant will always assess the resources available to it and optimise its investment in processes directed towards growth or differentiation. The term differentiation encompasseses increase formation of defence compounds as well as accelerated maturation and seed development. The C/N balance theory is a special and typical case of the GBDH theory, since low nitrogen availability is the most common growth-limiting condition in natural ecosystems. 15 To verify the above theories, several authors investigated the content of some vitamins and phyto-compounds in organically and conventionally produced crops.In order to summarise different data, for each organicconventional comparison a % difference was calculated (organic ? conventional)/conventional ? 100 The collected data fo r several desirable components are presented in Table 1. The role of vitamin C (ascorbic acid) in the human organism is basic for several metabolic functions, mainly because it is one of the major cellular direct antioxidants (along with glutathione) and is a 2759 E Rembialkowska Table 1. Contents of desirable components in organic crops relative to those in conventional crops Component Vitamin C Phenolic compounds Iron Magnesium Phosphorus Mean % difference +28.7 +119. 3 +21. 1 +29. 3 +13. 6 Range (%) ? 38 to +135. 5 ? 56. 6 to +734. 2 ? 73 to +240 ? 35 to +1206 ? 44 to +240 Number of studies 21 15 16 17 18 production and reduces carbohydrate production. Moreover, the change magnitude protein produced in response to high nitrogen levels contains lower amounts of certain essential amino acids such as lysine and therefore has a lower quality with observe to human nutrition. Source Ref. 17 and authors own calculations. cofactor for certain enzymes. Vitamin C also supports detoxicat ion and resistance of the human organism. The higher content of vitamin C in organic crops is bene?cial to health, because vitamin C inhibits the in situ formation of carcinogenic nitrosamines, thus diminishing the negative impact of nitrates on the human organism. 10 Therefore organic vegetables can play an important anticarcinogenic role. Plant-based phenolic metabolites are particularly interesting because of their potential antioxidant activity and medical properties, including anticarcinogenic activity. 15 According to Benbrook,16 organic farming has elevated antioxidant levels in about 85% of the cases studied to date and, on average, levels are about 30% higher compared with foods grown conventionally.Mineral compounds containing iron, magnesium and phosphorus are fundamental for human health. According to Worthington,17 the higher mineral content in organic crops may be connected with the higher abundance of micro-organisms in organically managed soil. These micro-organisms produce many compounds that help plants to combine with soil minerals and make them more available to plant roots. Unfortunately, there have been only a few studies on other vitamins such as ? -carotene, B1 and B2 and the results are contradictory. Therefore no general conclusions can be drawn about these compounds.Total sugars A higher total sugar content in plant crops not only improves their taste but is also an important component of their technological quality, e. g. in the case of sugar beet. Studies intelligibly indicate a higher content of total sugars, mainly sucrose, in organically produced vegetables and fruits such as carrots, sugar beet, red beetroot, potatoes, spinach, Savoy cabbage, cherries, redcurrants and apples. 11,18 Proteins Several studies analysed in review papers11 show that the quantity of crude protein is lower in organic than in conventional crops but that the quality is better as measured by essential amino acid content.According to Worthington,17 nitrog en from any kind of fertiliser affects the quantity and quality of protein produced by plants. Provision of a large amount of nitrogen to a plant increases protein 2760 SENSORY QUALITY OF ORGANIC FOODS Many studies have proved quite unequivocally that vegetables and fruits from organic farms have a better taste and smell. This was found for carrots and potatoes, celery and red beetroot, head cabbage and tomatoes as well as for apples, cherries and redcurrants.11 Organic fruits contained more total sugars, which probably in?uenced the better taste perception by consumers. Better taste and smell have also been found for bread made from organic grain, which also had better crumb elasticity. 6 Interesting studies have been conducted on animal food preference in which animals were given organic or conventional fodder.Most studies have proved a clear animal preference for foods produced organically such studies have been conducted on rats, mice, hens and rabbits. 19 Preference for organic fodder was also observe in cases where, according to chemical analyses, both organic and conventional fodder ful?lled all physiological needs of the animals tested. 20 The reason for this was probably the difference in taste between organic and conventional fodder. STORAGE QUALITY OF ORGANIC PLANT CROPS Transpiration losses and decay processes, as well as changes in nutritive value, normally take place during the storage period of potatoes and other vegetables. However, these changes can proceed at different rates and to differing degrees. Most of the available data indicate that the decay process is slower in organic crops, which therefore show better storage quality after the winter period.A review study based on many sources21 concluded that the storage quality of vegetables and fruits was better in the case of plants grown on organic farms (Table 2). The better storage quality of organic crops Table 2. Storage losses of carrots, potatoes and various fruits and vegetables from organic (ORG) and conventional (CONV) farmsa Carrots Potatoes Fruits and vegetables ORG CONV ORG CONV ORG CONV Number of quoted studies Storage loss (% of initial mass) a 15 33 15 40 22 22 22 30 53 28 53 38 Average data based on literature review.21 J Sci Food Agric 8727572762 (2007) DOI 10. 1002/jsfa Quality of organic plant products Table 3. Positive nutritive attributes of organic plant products No. 1 2 3 4 5 Attribute Organic crops contain fewer nitrates, nitrites and pesticide residues than conventional crops. There is no clear difference in the content of heavy metals between organic and conventional crops Organic plant products contain, as a rule, more dry matter, vitamin C, phenolic compounds, essential amino acids and total sugars. However, the level of ?-carotene is often higher in conventional plant products Organic plant products contain statistically more iron, magnesium and phosphorus. They also tend to contain more chromium, iodine, molybdenum, selenium, calcium, boro n, manganese, copper, potassium, sodium, atomic number 23 and zinc Organic plant products usually have better sensory quality. They have a clearer smell and taste and are sweeter and more compact because of their higher dry matter content Preference for organic products is typical not only for humans but also for animals such as rats, rabbits and hens.This preference was also observed in cases where, according to chemical analyses, both organic and conventional fodder ful? lled all physiological needs of the animals tested Vegetables and fruits from organic production maintain better quality during winter storage, showing lower mass losses due to transpiration, decay and decomposition processes. A possible reason for this is their higher content of dry matter, minerals, sugars and other bioactive compounds 6 Table 4. Negative and unclear aspects of organic plant products No.1 Negative aspect Plants cultivated in organic systems have, as a rule, signi?cantly (on average 20%) lower y ields than conventionally produced crops. This increases their price and creates for many consumers a barrier to buying organic foods Unclear aspect environmental contamination (heavy metals, PCBs, dioxins, aromatic hydrocarbons) can be similar in organic and conventional crops, because the impact of industrial, transport and communal sources is similar on organic and conventional farms located in the same area Bacterial (mainly Salmonella and Campylobacter)Contamination can sometimes be higher in organic produce, but scienti?c evidence of this is still not clear Mycotoxins can contaminate both organic and conventional foods, but scienti? c data are contradictory The impact of organic food consumption on human health and wellbeing remains essentially unknown in spite of some positive indications, so the subject needs further study 2 3 4 was probably associated with a higher content of dry matter in their ? esh, resulting in little extensive decay and decomposition. Lower losses in organic production have not only nutritive but also economic bene? ts.In conventional systems, high yields are produced but signi?cant losses during storage reduce the economic bene? ts. CONCLUSIONS Recent food crises (BSE, foot and mouth disease, food contamination by dioxins, toxic fungi, Salmonella and Campylobacter bacteria) have caused consumers to look for more authentic and safer foods. Organic food production is widely recognised as being more friendly to the environment, more controlled and better for animal welfare. On the other hand, many data indicate that a lot of food contaminants have their source in conventional methods of agriculture, animal production and food processing.The negative effect of the continuing enthusiastic use of chemical fertilisers and pesticides in agriculture is potentially huge. Therefore safer methods of agricultural production, mostly organic methods, are very important. Studies conducted in various countries have indicated several positive at tributes of organic plant J Sci Food Agric 8727572762 (2007) DOI 10. 1002/jsfa products (Table 3) but also a few negative and unclear aspects (Table 4). To summarise the positives, organic food should be recommended for all, but especially for young babies, pregnant and breast-feeding women, elderly and chronically ill people and vegetarians.The last group obviously consumes a lot of vegetables, which can contain too high levels of carcinogenic substances when produced conventionally. The lower content of nitrates and higher content of phenolic compounds and vitamin C in organic crops are especially important for health. Nitrates are easily converted in the digestive tract into foul nitrites, which are the precursors of carcinogenic nitrosamines. This process is hampered by vitamin C, and carcinogenesis is retarded by phenolic compounds and other dietary phytochemicals present at higher levels in organically produced crops.Therefore organic vegetables can play an important anticar cinogenic role. REFERENCES 1 Rembialkowska E, Organic agriculture and food quality, in Ecological Agriculture and Rural Development in central and Eastern European Countries, Vol. 44 of NATO Science Series, ed. by Filho WL. IOS Press, Amsterdam, pp. 185204 (2004). 2761 E Rembialkowska ? ? 2 Schuphan W, Biochemische Sortenprufung an Gartenmohren ? ? als neuzeitliche Grundlage fur planvolle Zuchtungsarbeit. Z? chter 22543 (1942).U 3 Franz E, van Bruggen AHC and Semenov AM, Risk-analysis of human pathogen spread in the vegetable industry a comparison between organic and conventional production chains, in Bayesian Statistics and Quality Modelling in the AgroFood Production Chain, ed. by van Boekel MAJS, Stein A and van Bruggen AHC. Kluwer Academic, Dordrecht, pp. 8194 (2004). 4 FAO, Food Safety as alter by Organic Farming (Twentysecond FAO Regional Conference for Europe). Online. (2000). Available www. fao. org/docrep/meeting/x4983. htm. 5 Van Bruggen AHC and Termorshuizen AJ, Integra ted approaches to root disease management in organic farming systems.Aust Plant Pathol 32141156 (2003). 6 Bjorn G and Fruekilde AM, Cepa onions (Allium cepa L) grown conventionally and organically similarities and differences. Gron Viden 15316 (2003). (in Danish). 7 Hansen B, Alroe HF, Kristensen ES and Wier M, Assessment of food safe in organic farming. DARCOF Working Paper 52 (2002). 8 EU, Council Regulation No. 2092/91 of 24 June 1991 on organic production of agricultural products and indications referring to that on agricultural products and foodstuffs. OJL 198, 22. 7 P. 1 (1991). ? 9 Szponar L and Kierzkowska E, Azotany i azotyny w srodowisku oraz ich wplyw na zdrowie czlowieka.Post Hig Med Do? w s 44327350 (1990). 10 Mirvish SS, Vitamin C inhibition of N-nitroso compounds formation. Am J Clin Nutr 57598599 (1993). 11 Rembialkowska E, Wholesomeness and Sensory Quality of Potatoes and Selected Vegetables from the Organic Farms. Fundacja ? Rozwoj SGGW, Warszawa (2000). 12 BMA, The BMA Guide to Pesticides, Chemicals and Health. Report of Science and Education. British Medical Association, London (1992). 13 Aubert C, Pollution du lait maternel, une enquete de terre vivante. Quatre Saisons Jardinage 423339 (1987).14 Lundeg? rdh B and M?rtensson A, Organically produced plant a a foods evidence of health bene? ts. Acta Agric Scand B 53315 (2003). 15 Brandt K and Molgaard JP, Organic agriculture does it enhance or reduce the nutritional value of plant foods? J Sci Food Agric 81924931 (2001). 16 Benbrook CM, Elevating Antioxidant Levels in Food through Organic Farming and Food Processing. An Organic relate of Science Review. Organic Center for Education and Promotion (2005). 17 Worthington V, nutritionary quality of organic versus conventional fruits, vegetables, and grains. J Alternative Compl Med 7161173 (2001).18 Zadoks JC, Development of Farming Systems. Pudoc, Wageningen (1989). 19 Williams CM, Nutritional quality of organic food shades of grey or shades of green? Proc Nutr Soc 611924 (2002). ? 20 Woese K, Lange D, Boess Ch and Bogl KW, A comparison of organically and conventionally grown foods results of a review of the relevant literature. J Sci Food Agric 74281293 (1997). 21 Bulling W, Qualit? tsvergleich von biologisch und konventionell a erzeugten Feldfruchten. Regierungsprasidium, Stuttgart (1987). 2762 J Sci Food Agric 8727572762 (2007) DOI 10. 1002/jsfa.