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Phytochemicals are chemical compounds produced by plants, generally to help them thrive or thwart competitors, predators, or pathogens. The name comes from the Greek word phyton, meaning plant. Some phytochemicals have been used as poisons and others as traditional medicine. As a term, phytochemicals is generally used to describe plant compounds that are under research with unestablished effects on health and are not scientifically defined as essential nutrients. Regulatory agencies governing food labeling in Europe and the United States have provided guidance for industry limiting or preventing health claims about phytochemicals on food product or nutrition labels.

Contents

1 Definition 2 History of uses 3 Functions 4 Consumer and industry guidance 5 Effects of food processing 6 See also 7 References 8 Further reading 9 External links

Definition[edit] Plants are composed entirely of chemicals of various kinds.[1] Phytochemicals (from Greek phyto, meaning "plant") are chemicals produced by plants through primary or secondary metabolism.[2][3] They generally have biological activity in the plant host and play a role in plant growth or defense against competitors, pathogens, or predators.[2] Phytochemicals generally are regarded as research compounds rather than essential nutrients because proof of their possible health effects has not been established yet.[4][5] Phytochemicals under research can be classified into major categories, such as carotenoids[6] and polyphenols, which include phenolic acids, flavonoids, and stilbenes/lignans.[5] Flavonoids
Flavonoids
can be further divided into groups based on their similar chemical structure, such as anthocyanins, flavones, flavanones, and isoflavones, and flavanols.[5][7] Flavanols
Flavanols
further are classified as catechins, epicatechins, and proanthocyanidins.[5][7] Phytochemists study phytochemicals by first extracting and isolating compounds from the origin plant, followed by defining their structure or testing in laboratory model systems, such as cell cultures, in vitro experiments, or in vivo studies using laboratory animals.[2] Challenges in that field include isolating specific compounds and determining their structures, which are often complex, and identifying what specific phytochemical is primarily responsible for any given biological activity.[2] History of uses[edit]

Berries of Atropa belladonna, also called deadly nightshade

Without specific knowledge of their cellular actions or mechanisms, phytochemicals have been used as poison and in traditional medicine. For example, salicin, having anti-inflammatory and pain-relieving properties, was originally extracted from the bark of the white willow tree and later synthetically produced to become the common, over-the-counter drug, aspirin.[8][9] The tropane alkaloids of A. belladonna were used as poisons, and early humans made poisonous arrows from the plant.[10] In Ancient Rome, it was used as a poison by Agrippina the Younger, wife of Emperor Claudius
Claudius
on advice of Locusta, a lady specialized in poisons, and Livia, who is rumored to have used it to kill her husband Emperor Augustus.[10][11] The English yew
English yew
tree was long known to be extremely and immediately toxic to animals that grazed on its leaves or children who ate its berries; however, in 1971, paclitaxel was isolated from it, subsequently becoming an important cancer drug.[2] As of 2017, the biological activities for most phytochemicals are unknown or poorly understood, in isolation or as part of foods.[2][5] Phytochemicals with established roles in the body are classified as essential nutrients.[4][12] Functions[edit] The phytochemical category includes compounds recognized as essential nutrients, which are naturally contained in plants and are required for normal physiological functions, so must be obtained from the diet in humans.[12][13] Some phytochemicals are known phytotoxins that are toxic to humans;[14][15] for example aristolochic acid is carcinogenic at low doses.[16] Some phytochemicals are antinutrients that interfere with the absorption of nutrients.[17] Others, such as some polyphenols and flavonoids, may be pro-oxidants in high ingested amounts.[18] Nondigestible dietary fibers from plant foods, often considered as a phytochemical,[19] are now generally regarded as a nutrient group having approved health claims for reducing the risk of some types of cancer[20] and coronary heart disease.[21] Eating a diet high in fruits, vegetables, grains, legumes and plant-based beverages has long-term health benefits,[12] but there is no evidence that taking dietary supplements of non-nutrient phytochemicals extracted from plants similarly benefits health.[4] Phytochemical
Phytochemical
supplements are neither recommended by health authorities for improving health[5][22] nor approved by regulatory agencies for health claims on product labels.[23][24] Consumer and industry guidance[edit] While health authorities encourage consumers to eat diets rich in fruit, vegetables, whole grains, legumes, and nuts to improve and maintain health,[12] evidence that such effects result from specific, non-nutrient phytochemicals is limited or absent.[4] For example, systematic reviews and/or meta-analyses indicate weak or no evidence for phytochemicals from plant food consumption having an effect on breast, lung, or bladder cancers.[25][26] Further, in the United States, regulations exist to limit the language on product labels for how plant food consumption may affect cancers, excluding mention of any phytochemical except for those with established health benefits against cancer, such as dietary fiber, vitamin A, and vitamin C.[27] Phytochemicals, such as polyphenols, have been specifically discouraged from food labeling in Europe and the United States because there is no evidence for a cause-and-effect relationship between dietary polyphenols and inhibition or prevention of any disease.[23][28] Among carotenoids such as the tomato phytochemical, lycopene, the US Food and Drug Administration
Food and Drug Administration
found insufficient evidence for its effects on any of several cancer types, resulting in limited language for how products containing lycopene can be described on labels.[29] Effects of food processing[edit] Phytochemicals in freshly harvested plant foods may be degraded by processing techniques, including cooking.[30][31][32] The main cause of phytochemical loss from cooking is thermal decomposition.[32] A converse exists in the case of carotenoids, such as lycopene present in tomatoes, which may remain stable or increase in content from cooking due to liberation from cellular membranes in the cooked food.[33] Food processing techniques like mechanical processing can also free carotenoids and other phytochemicals from the food matrix, increasing dietary intake.[32][34] In some cases, processing of food is necessary to remove phytotoxins or antinutrients; for example societies that use cassava as a staple have traditional practices that involve some processing (soaking, cooking, fermentation, etc.), which are necessary to avoid getting sick from cyanogenic glycosides present in unprocessed cassava.[35] See also[edit]

Allelopathy List of antioxidants in food List of phytochemicals in food Nutrition Secondary metabolites

References[edit]

^ Breslin, Andrew (2017). "The Chemical Composition of Green Plants". Sciencing, Leaf Group Ltd.  ^ a b c d e f Molyneux, RJ; Lee, ST; Gardner, DR; Panter, KE; James, LF (2007). "Phytochemicals: the good, the bad and the ugly?". Phytochemistry. 68 (22–24): 2973–85. doi:10.1016/j.phytochem.2007.09.004. PMID 17950388.  ^ Harborne, Jeffrey B.; Baxter, Herbert; Moss, Gerard P., eds. (1999). "General Introduction". Phytochemical
Phytochemical
dictionary a handbook of bioactive compounds from plants (2nd ed.). London: Taylor & Francis. p. vii. ISBN 9780203483756.  ^ a b c d "Phytochemicals". Micronutrient Information Center, Linus Pauling Institute, Oregon State University, Corvallis, Oregon. 2017. Retrieved 12 February 2017.  ^ a b c d e f Heneman, Karrie; Zidenberg-Cherr, Sheri (2008). "Publication 8313: Phytochemicals" (PDF). University of California Cooperative Extension.  ^ "Carotenoids". Micronutrient Information Center, Linus Pauling Institute, Oregon State University, Corvallis, Oregon. July 2016. Retrieved 12 February 2017.  ^ a b "Flavonoids". Micronutrient Information Center, Linus Pauling Institute, Oregon State University, Corvallis, Oregon. November 2015. Retrieved 12 February 2017.  ^ Sneader, W. (2000). "The discovery of aspirin: A reappraisal". BMJ (Clinical research ed.). 321 (7276): 1591–1594. doi:10.1136/bmj.321.7276.1591. PMC 1119266 . PMID 11124191.  ^ Landau E (22 Dec 2010). "From a tree, a 'miracle' called aspirin". CNN. Retrieved 18 June 2014.  ^ a b Michael (1998). Alkaloids : biochemistry, ecology, and medicinal applications. New York: Plenum Press. p. 20. ISBN 0-306-45465-3.  ^ Timbrell, John (2005). The poison paradox : chemicals as friends and foes. Oxford: Oxford Univ. Pr. p. 2. ISBN 0-19-280495-2.  ^ a b c d "Why is it important to eat vegetables? Nutrients". ChooseMyPlate.gov, USDA Center for Nutrition
Nutrition
Policy & Promotion, US Department of Agriculture. 16 January 2016. Retrieved 12 February 2017.  ^ "What is an essential nutrient?". NetBiochem Nutrition, University of Utah.  ^ Iwasaki, S (April 1998). "Natural organic compounds that affect to microtubule functions". Yakugaku Zasshi. 118 (4): 112–26. PMID 9564789.  ^ Bjeldanes, Leonard; Shibamoto, Takayuki (2009). Introduction to Food Toxicology (2nd ed.). Burlington: Elsevier. p. 124. ISBN 9780080921532.  ^ Shaw, D (December 2010). "Toxicological risks of Chinese herbs". Planta Medica. 76 (17): 2012–8. doi:10.1055/s-0030-1250533. PMID 21077025.  ^ Oxford Dictionary of Biochemistry and Molecular Biology. Oxford University Press, 2006. ISBN 0-19-852917-1. ^ Halliwell, B (2007). "Dietary polyphenols: Good, bad, or indifferent for your health?". Cardiovascular Research. 73 (2): 341–7. doi:10.1016/j.cardiores.2006.10.004. PMID 17141749.  ^ "Fiber". Micronutrient Information Center, Linus Pauling Institute, Oregon State University, Corvallis, Oregon. April 2012. Retrieved 12 February 2017.  ^ "Health claims: fiber-containing grain products, fruits, and vegetables and cancer; Title 21: Food and Drugs, Subpart E, 101.76". U.S. Food and Drug Administration. 5 January 2017. Retrieved 8 January 2017.  ^ "Health claims: Soluble fiber from certain foods and risk of coronary heart disease (CHD); Title 21: Food and Drugs, Subpart E, 101.81". U.S. Food and Drug Administration. 5 January 2017. Retrieved 8 January 2017.  ^ "Common questions about diet and cancer". American Cancer
Cancer
Society. 5 February 2016. Retrieved 8 January 2017.  ^ a b EFSA Panel on Dietetic Products, Nutrition
Nutrition
and Allergies (NDA)2, 3 European Food Safety Authority (EFSA), Parma, Italy (2010). "Scientific Opinion on the substantiation of health claims related to various food(s)/food constituent(s) and protection of cells from premature aging, antioxidant activity, antioxidant content and antioxidant properties, and protection of DNA, proteins and lipids from oxidative damage pursuant to Article 13(1) of Regulation (EC) No 1924/20061" (PDF). EFSA Journal. 8 (2): 1489. doi:10.2903/j.efsa.2010.1489. CS1 maint: Multiple names: authors list (link) ^ "Code of Federal Regulations, Title 21, Part 101, Food Labeleing, Subpart D, Specific Requirements for Nutrient Content Claims, Section 101.54". US Food and Drug Administration. 1 April 2016. Retrieved 12 February 2017.  ^ Aune, D; Chan, D. S.; Vieira, A. R.; Rosenblatt, D. A.; Vieira, R; Greenwood, D. C.; Norat, T (2012). "Fruits, vegetables and breast cancer risk: A systematic review and meta-analysis of prospective studies". Breast Cancer
Cancer
Research and Treatment. 134 (2): 479–93. doi:10.1007/s10549-012-2118-1. PMID 22706630.  ^ Smith-Warner, S. A.; Spiegelman, D; Yaun, S. S.; Albanes, D; Beeson, W. L.; Van Den Brandt, P. A.; Feskanich, D; Folsom, A. R.; Fraser, G. E.; Freudenheim, J. L.; Giovannucci, E; Goldbohm, R. A.; Graham, S; Kushi, L. H.; Miller, A. B.; Pietinen, P; Rohan, T. E.; Speizer, F. E.; Willett, W. C.; Hunter, D. J. (2003). "Fruits, vegetables and lung cancer: A pooled analysis of cohort studies". International Journal of Cancer. 107 (6): 1001–11. doi:10.1002/ijc.11490. PMID 14601062.  ^ "Electronic Code of Federal Regulations, Title 21, Chapter I, Subchapter B, Part 101.78. Health claims: fruits and vegetables and cancer". US Government Printing Office. 9 February 2017. Retrieved 12 February 2017.  ^ Gross P (1 March 2009), New Roles for Polyphenols. A 3-Part Report on Current Regulations & the State of Science, Nutraceuticals World, retrieved 12 February 2017  ^ Schneeman BO (9 July 2015). "Qualified Health Claims: Letter Regarding "Tomatoes and Prostate, Ovarian, Gastric and Pancreatic Cancers (American Longevity Petition)" (Docket No. 2004Q-0201)". Office of Nutritional Products, Labeling and Dietary Supplements, Center for Food Safety and Applied Nutrition, US Food and Drug Administration. Retrieved 12 February 2017.  ^ Bongoni, R; Steenbekkers, L.P.A; Verkerk, R; van Boekel, M.A.J.S; Dekker, M (2013). "Studying consumer behaviour related to the quality of food: A case on vegetable preparation affecting sensory and health attributes". Trends in Food Science & Technology. 33 (2): 139–145. doi:10.1016/j.tifs.2013.08.004.  ^ Bongoni, R; Verkerk, R; Steenbekkers, B; Dekker, M; Stieger (2014). "Evaluation of Different Cooking Conditions on Broccoli (Brassica oleracea var. italica) to Improve the Nutritional Value and Consumer Acceptance". Plant foods for human nutrition. 69 (3): 228–234. doi:10.1007/s11130-014-0420-2. PMID 24853375.  ^ a b c Palermo, M; Pellegrini, N; Fogliano, V (2014). "The effect of cooking on the phytochemical content of vegetables". Journal of the Science of Food and Agriculture. 94 (6): 1057–70. doi:10.1002/jsfa.6478. PMID 24227349.  ^ Dewanto, V; Wu, X; Adom, KK; Liu, RH (2002). "Thermal processing enhances the nutritional value of tomatoes by increasing total antioxidant activity". Journal of Agricultural and Food Chemistry. 50 (10): 3010–4. doi:10.1021/jf0115589. PMID 11982434.  ^ Hotz, C; Gibson, R. S. (2007). "Traditional food-processing and preparation practices to enhance the bioavailability of micronutrients in plant-based diets". The Journal of Nutrition. 137 (4): 1097–100. PMID 17374686.  ^ Contents: Roots, tubers, plantains and bananas in human nutrition. Rome: FAO. 1990.  Chapter 7: Cassava
Cassava
toxicity

Further reading[edit]

Higdon, J. An Evidence – Based Approach to Dietary Phytochemicals. 2007. Thieme. ISBN 978-1-58890-408-9. Rosa, L.A. de la / Alvarez-Parrilla, E. / González-Aguilar, G.A. (eds.) Fruit and Vegetable Phytochemicals: Chemistry, Nutritional Value and Stability. 2010. Wiley-Blackwell. ISBN 978-0-8138-0320-3.

External links[edit]

Media related to Phytochemicals at Wikimedia Commons Dr. Duke's Phytochemical
Phytochemical
and Ethnobotanical Databases – United States Department of Agriculture

v t e

Types of phytochemicals

Terpenoids

v t e

Types of Terpenes and Terpenoids (# of isoprene units)

Basic forms:

Acyclic (linear, cis and trans forms) Monocyclic (single ring) Bicyclic (2 rings) Iridoids (cyclopentane ring) Iridoid
Iridoid
glycosides (iridoids bound to a sugar) Steroids (4 rings)

Hemiterpenoids (1)

Isoprene
Isoprene
(C5H8) Prenol Isovaleric acid

Monoterpene
Monoterpene
(C10H16)(2)

Acyclic

Ocimene Myrcenes

Monocyclic

Limonene Terpinene Phellandrene Umbellulone

Bicyclic

Pinene
Pinene
(β and α Camphene Thujene Sabinene Carene

Monoterpenoids (2,modified)

Acyclic

Linalool Citronellal Citral Citronellol Geraniol Geranyl pyrophosphate

Monocyclic

Grapefruit mercaptan menthol p-Cymene thymol Perillyl alcohol Carvacrol

Bicyclic

Camphor Borneol Eucalyptol Halomon Eucalyptol Pinene Ascaridole

Sesquiterpenoids
Sesquiterpenoids
(3)

Farnesyl pyrophosphate Artemisinin Bisabolol

Diterpenoids (4)

Geranylgeranyl pyrophosphate Gibberellin Retinol Retinal Phytol Taxol Forskolin Aphidicolin Salvinorin A

Sesterterpenoids (5)

geranylfarnesol

Triterpenoids (6)

Steroids

Phytosterols

Campesterol beta Sitosterol gamma sitosterol Stigmasterol

Tocopherols Cholesterol Testosterone Cholecalciferol
Cholecalciferol
(Vit D) Ecdysones

Other

Saponins Squalane Lanosterol Acids

Oleanolic acid Ursolic acid Betulinic acid Moronic acid

Sesquarterpenes/oids (7)

ferrugicadiol tetraprenylcurcumene

Tetraterpenoids (Carotenoids) (8)

Carotenes

Alpha-Carotene Beta-Carotene Gamma-Carotene Delta-Carotene Lycopene Neurosporene Phytofluene Phytoene

Xanthophylls:

Canthaxanthin Cryptoxanthin Zeaxanthin Astaxanthin Lutein Rubixanthin

Polyterpenoids (many)

sap, resins, latex of many plants, e.g. rubber

Norisoprenoids (modified)

3-oxo-α-ionol 7,8-dihydroionone

Synthesis

Terpene
Terpene
synthase enzymes (many), having in common a Terpene
Terpene
synthase N terminal domain (protein domain)

Activated isoprene forms

Isopentenyl pyrophosphate
Isopentenyl pyrophosphate
(IPP) Dimethylallyl pyrophosphate
Dimethylallyl pyrophosphate
(DMAPP)

Phenolic compounds

v t e

Types of phenolic compounds

Natural monophenols

Benzenediols Benzenetriols Apiole Carnosol Carvacrol Dillapiole Rosemarinol

Polyphenols

v t e

Types of polyphenols

Flavonoids (C6-C3-C6)

v t e

Types of flavonoids

Flavonoids

Anthoxanthins

Flavones

Apigenin, Chrysin, et.c.

Flavonols

Quercetin, Kaempferol, et.c.

Isoflavoness

Daidzein, Genistein, Orobol
Orobol
et.c.

Neoflavonoids

Dalbergichromene

Flavans

Flavan

Luteoliflavan

Flavan-3-ols (flavanols)

Catechin, Gallocatechol, et.c.

Flavan-4-ols (flavanols)

Apiforol, Luteoforol, et.c.

Flavan-3,4-diols

Leucocyanidin, Leucodelphinidin, et.c.

Flavanones

Hesperidin Naringenin Eriodictyol

Flavanonols

Taxifolin Aromadendrin, et.c.

Anthocyanidins

3-deoxyanthocyanidins

Cyanidin, Delphinidin, et.c.

3-hydroxyanthocyanidin

Apigeninidin, Guibourtinidin, et.c.

Aurones

Aureusidin Leptosidin

Chalcones

Chalcones

Butein, Isoliquiritigenin, et.c.

Dihydrochalcone

Phloretin

Miscellaneous

List of phytochemicals in food C-methylated flavonoids O-methylated flavonoids Furanoflavonoids Pyranoflavonoids Prenylflavonoids Methylenedioxy Castavinols

Flavonoid
Flavonoid
biosynthesis

Flavonolignans

Silymarin

Lignans ((C6-C3)2)

Matairesinol Secoisolariciresinol Pinoresinol

Stilbenoids (C6-C2-C6)

Resveratrol Pterostilbene Piceatannol Pinosylvin

Curcuminoids

Curcumin

Tannins

v t e

Types of natural tannins

Hydrolysable tannins

Ellagitannins

Punicalagins Castalagins Vescalagins Castalins Casuarictins Grandinins Punicalins Roburin A Tellimagrandin IIs Terflavin B

Gallotannins

Digalloyl glucose 1,3,6-Trigalloyl glucose

Condensed tannins

Proanthocyanidins Polyflavonoid tannins Catechol-type tannins Pyrocatecollic type tannins Flavolans

Phlorotannins

Eckol 8,8′-Bieckol 6,6'-Bieckol Dieckol Eckstolonol Diphlorethol Difucol Fucophlorethol A Phlorofucofuroeckol A Tetrafucol A Trifucol Bifuhalol 7-Phloroeckol Phlorofucofuroeckol B

Flavono-ellagitannins (complex tannins)

Epicutissimin A Acutissimin A

Other Miscellaneous

Tannin
Tannin
sources Pseudo tannins Synthetic tannins Tannin
Tannin
uses

Enological Drilling Ink Tanning

Others

Diarylheptanoids (C6-C7-C6) Anthraquinones Chalconoids (C6-C3-C6) Kavalactones Naphthoquinones (C6-C4) Phenylpropanoids (C6-C3) Xanthonoids (C6-C1-C6) Coumarins and isocoumarins

Misc:

Polyphenols

Aromatic acids

v t e

Aromatic acids

Phenolic acids

Monohydroxybenzoic acids

Aglycones

3-Hydroxybenzoic acid 4-Hydroxybenzoic acid Salicylic acid

Glycosides

p-Hydroxybenzoic acid glucoside

Dihydroxybenzoic acids

2,3- Dihydroxybenzoic acid (Hypogallic acid) 2,4-Dihydroxybenzoic acid 2,6-Dihydroxybenzoic acid 3,5-Dihydroxybenzoic acid Ethyl protocatechuate Gentisic acid Homogentisic acid Orsellinic acid Protocatechuic acid

Trihydroxybenzoic acids

Bergenin Chebulic acid Ethyl gallate Eudesmic acid Gallic acid Tannic acid Norbergenin Phloroglucinol carboxylic acid Syringic acid Theogallin

Other phenolic acids

Vanillin Ellagic acid

Hydroxycinnamic acids

α-Cyano-4-hydroxycinnamic acid Caffeic acid Cichoric acid Cinnamic acid Chlorogenic acid Diferulic acids Coumaric acid Coumarin Ferulic acid Sinapinic acid

Aromatic amino acids

phenylalanine tryptophan histidine tyrosine thyroxine 5-hydroxytryptophan L-DOPA

Phenylethanoids

Tyrosol Hydroxytyrosol Oleocanthal Oleuropein

Others

Capsaicin Gingerol Alkylresorcinols

Misc:

Phenolic compounds Phlorotannins)

Glucosinolates

Precursor to isothiocyanates

Sinigrin Gluconasturtiin Glucoraphanin

Aglycone derivatives

Isothiocyanates

Sulforaphane Allyl isothiocyanate Phenethyl Isothiocyanate

Nitriles Thiocyanates

Organosulfides

Sulfides Polysulfides

Diallyl disulfide

Indoles

Indole-3-carbinol 3,3'-Diindolylmethane Allicin Alliin Allyl isothiocyanate Piperine Syn-propanethial-S-oxide

Betalains

Betacyanins

Betanin

Betaxanthins

Indicaxanthin Vulgaxanthin

Chlorophylls

Chlorophyllin

Organic acids

Saturated cyclic acids

Phytic acid Quinic acid

Oxalic acid Tartaric acid Anacardic acid Malic acid Caftaric acid Coutaric acid Fertaric acid

Carbohydrates

Monosaccharides

Hexoses Pentoses

Polysaccharides

Beta-glucan

Chitin Lentinan

Fructan

Inulins

Lignin Pectin

Misc:

List of phytochemicals and foods in which

.