{"id":3428,"date":"2020-02-05T13:03:59","date_gmt":"2020-02-05T18:03:59","guid":{"rendered":"https:\/\/www.phytochemia.com\/?p=3428"},"modified":"2020-02-05T13:03:59","modified_gmt":"2020-02-05T18:03:59","slug":"rosa-rosam-rosae-part-1","status":"publish","type":"articles-de-blogue","link":"https:\/\/phytochemia.com\/en\/articles-de-blogue\/rosa-rosam-rosae-part-1\/","title":{"rendered":"Rosa, Rosam, Rosae"},"content":{"rendered":"<p>Corine Lormel , PhD<\/p>\n<p style=\"text-align: center;\">As suggested by the Latin declension of the title, this February we will look at <span style=\"text-decoration: underline;\">a series of blog posts<\/span> on <strong>the theme of roses.<\/strong><\/p>\n<p style=\"text-align: justify;\">In this first post, we will start with a historical overview of the rose&#8217;s botany and a summary of the main methods to produce rose derivative products : essential oil, hydrosol, absolute and concrete.<\/p>\n<table class=\"tr-caption-container\" style=\"float: right; margin-left: 1em; width: 100%;\">\n<tbody>\n<tr>\n<td style=\"text-align: center; width: 100%;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-3407 \" src=\"https:\/\/phytochemia.com\/wp-content\/uploads\/2020\/02\/Sans-titre-1-750x563.png\" alt=\"\" width=\"538\" height=\"404\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"tr-caption\" style=\"text-align: center; width: 100%;\"><span style=\"font-size: xx-small;\">Image composed from https:\/\/pixabay.com\/fr\/photos\/romance-rose-aimer-rose-rouge-4520920\/ sample<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u00a0<\/h3>\n<h3>\u00a0<\/h3>\n<h3>A Brief History of Roses<\/h3>\n<p style=\"text-align: justify;\">Roses are plants from the Rosaceae family. The genus <em>Rosa<\/em> is subdivided in four subgenera. <em>Eurosa<\/em> subgenus is the most considerable, it contains the majority of the overall 100 to 300 species of roses (depending on the sources).<\/p>\n<p style=\"text-align: justify;\">Roses are among the most cultivated plants in the world and hybridize easily even in their natural state. The 16,000 cultivar* types, currently available, result from millennia of transformations. Surprisingly, genetic tests show that most of the cultivated varieties result from roughly a dozen species and their derived taxa.<\/p>\n<p>&nbsp;<\/p>\n<table class=\"tr-caption-container\" style=\"float: right; margin-left: 1em; width: 17.9427%; height: 77px;\">\n<tbody>\n<tr style=\"height: 53px;\">\n<td style=\"width: 100%; height: 77px; text-align: center;\"><img decoding=\"async\" class=\"wp-image-3445  aligncenter\" src=\"https:\/\/phytochemia.com\/wp-content\/uploads\/2020\/02\/Rosa-canina-e1580882589421.jpeg\" alt=\"\" width=\"182\" height=\"136\" \/><span style=\"font-family: inherit; font-size: inherit;\">Dog rose, <\/span><em style=\"font-family: inherit; font-size: inherit;\">Rosa Canina<\/em><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\">In botany it is commonly accepted to divide roses between old and modern varieties. Originally wild roses, also named botanical or antique (which include among the others wild heather rose such as <em>Rosa canina<\/em> generally employed as a rootstock) were predominant. These wild species are the most rustic, adaptative and very fragrant. They develop an abundant flowering for a brief period and only once a year. <em>Rosa chinensis<\/em> is an exception with a long flowering period.<\/p>\n<table class=\"tr-caption-container\" style=\"float: left; margin-right: 1em; width: 10.1705%; height: 10px;\">\n<tbody>\n<tr style=\"height: 10px;\">\n<td style=\"width: 100%; height: 10px;\">\n<p style=\"text-align: center;\"><img decoding=\"async\" class=\"wp-image-3396 aligncenter\" src=\"https:\/\/phytochemia.com\/wp-content\/uploads\/2020\/02\/La-France.png\" alt=\"\" width=\"112\" height=\"112\" \/><span style=\"font-family: inherit; font-size: inherit;\">Rosa &#8216;La France&#8217;<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\">In 1867, the first hybrid tea (Rosa &#8216;La France&#8217;) or large-flowered rose, developed by Jean-Baptiste Guillot, was the starting point for the explosion of ascending varieties i.e., featuring continuous blooming. The hybridization with <i>Rosa chinensis<\/i> had provided a repeat-blooming characteristic very suitable for cultivation. All cultivars or hybrids created after this date are considered as modern roses.\u00a0 They were hybridized mostly in favor of their color or shape and as a consequence usually fail to exude the original rose fragrance.<\/p>\n<p style=\"text-align: justify;\">This diversity leads to expect a great variability in chemical composition of roses. We will explore this subject later in the month. \u00a0<\/p>\n<p>&nbsp;<\/p>\n<h3>Compounds Extraction<\/h3>\n<p style=\"text-align: justify;\">Exploitation of roses for their olfactory or medicinal qualities is very antique. One of the first methods, now almost abandoned, is probably enfleurage. A fatty substance was used to obtain extractives from petals by maceration at ambient or low temperature. The process, which can be quite long and fastidious, was repeated until the oil or fat substance saturation. A fragrant oil or an ointment can be obtained thereof. There is a small market for this type of process. Current methods are distillation, extraction by solvents and more recently supercritical CO<sub>2<\/sub> extraction.<\/p>\n<h5>Essential Oil and Cohobation &#8211; Hydrodistillation<\/h5>\n<p style=\"text-align: justify;\">Rose essential oil, also named rose essence or attar (otto) of roses, is obtained by hydrodistillation and\/or steam distillation with cohobation. Rather than adding fresh water to feed the distillation process, the water evaporated with the essential oil is reintroduced into the system. The same matter is distilled several times and this process is named cohobation. Therefore, some water-soluble molecules are concentrated into the essential oil and provide an oil rich in oxygenated compounds. More than 70% of the rose essential oil comes from cohobation. You may find more information about distillation and cohobation on a lab scale <a href=\"https:\/\/phytochemia.com\/en\/2014\/08\/04\/extracting-essential-oils-in-the-lab\/\">in this previous blog paper <\/a>and with the Explorer from AlChemia <a href=\"https:\/\/phytochemia.com\/en\/2018\/07\/03\/about-canadian-wintergreen\/\">in this blog.<\/a>\u00a0\u00a0<\/p>\n<p style=\"text-align: justify;\">The most popular essential oil comes from the Damask rose (<em>Rosa \u00d7 damascena)<\/em> and the Provence rose (<em>Rosa \u00d7 centifolia)<\/em>. There is a great demand in perfumery and aromatherapy for these products.<\/p>\n<h6>Rose Hydrosol<\/h6>\n<p style=\"text-align: justify;\">Rose hydrosol, also called rose water, is the aqueous condensate obtained during the hydrodistillation of rose petals. It is often used in cosmetics and food industry. Several hydrosols and essential oils have the same origin: Damask and Provence roses.<\/p>\n<h5>Rose Absolute\u00a0 and Concrete &#8211; Solvent Extraction\u00a0<\/h5>\n<p style=\"text-align: justify;\">The absolute of rose is obtained by extracting aromatic compounds from roses using solvents. Hexane is widely used since aromatic compounds, wax and rose pigments have a great affinity with it. The solvent is eliminated by distillation and\/or evaporation under vacuum to produce an extract with a gelatinous consistency, an orange-red color and a typical odor of roses named the concrete. A second extraction with alcohol is generally performed on the concrete, to isolate the aromatic compounds of the concrete from the other components, and finally the solvent is filtered and evaporated to obtain the absolute.\u00a0<\/p>\n<h5>\u00a0CO<sub>2<\/sub> Extract &#8211; Supercritical Extraction<\/h5>\n<p style=\"text-align: justify;\">In the supercritical CO<sub>2<\/sub> extraction method, a supercritical fluid circulates in the plant matrix. This CO<sub>2<\/sub> physical state, reached under specific temperature and overpressure conditions, gives it both the properties of a gas and a liquid. It can thus, like a gas, penetrate porous matrices and, like a liquid, dissolve compounds and entrain them. Subsequently, a depressurization leads to CO<sub>2<\/sub> vaporization and an extract in liquid or solid form appears. In addition, depending on the operating conditions, the composition of the extract can be tuned. A selectivity towards lighter volatile molecules can be achieved, or an extraction of all the lipophilic compounds can be preferred.<\/p>\n<p style=\"text-align: center;\">This introduction to the world of roses is now over. We are waiting for you next week to break down these different extracts.<\/p>\n<pre id=\"tw-target-text\" class=\"tw-data-text tw-text-large tw-ta\" dir=\"ltr\" data-placeholder=\"Traduction\">\u00a0<\/pre>\n<p><\/p>","protected":false},"template":"","categories-darticle":[31],"class_list":["post-3428","articles-de-blogue","type-articles-de-blogue","status-publish","has-post-thumbnail","hentry","categories-darticle-popularization"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rosa, Rosam, Rosae - PhytoChemia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/phytochemia.com\/en\/articles-de-blogue\/rosa-rosam-rosae-part-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rosa, Rosam, Rosae - 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