This paper presents two high performance liquid chromatographic (HPLC) methods used for the separation and determination of artificial sweeteners aspartame, acesulphame K, sodium saccharin, and ...sodium cyclamate in beverages and special nutritional products (special food intended for specific population groups). All four compounds are soluble in aqueous solutions and can easily be separated and determined by HPLC with a diode array detector (DAD). The first method involved separation of aspartame, acesulphame K, and sodium saccharin on a C18 column with an isocratic elution of phosphate buffer and acetonitrile as mobile phase. The second method was used to separate sodium cyclamate on a C18 column with methanol and water as mobile phase. Under optimum conditions, both methods showed good analytical performance, such as linearity, precision, and recovery. The methods were successfully applied for the analysis of real samples of soft drinks and special nutritional products.
Ovaj rad predstavlja dvije metode za separaciju i određivanje umjetnih sladila aspartama, acesulfama K, natrijeva saharina i natrijeva ciklamata u osvježavajućim bezalkoholnim pićima i posebnim prehrambenim proizvodima tehnikom tekućinske kromatografije visoke djelotvornosti (HPLC). Sva četiri analita topljiva su u vodenim otopinama i lako se mogu razdvojiti i odrediti tekućinskom kromatografijom uz primjenu detektora s nizom dioda (DAD). Prva je metoda kromatografsko razdvajanje aspartama, acesulfama K i natrij saharina na C18 koloni izokratnim ispiranjem fosfatnog pufera i acetonitrila kao mobilne faze. Druga metoda omogućava određivanje natrijeva ciklamata na C18 koloni sa metanolom i vodom kao mobilnom fazom. Pod najpovoljnijim eksperimentalnim uvjetima obadvije metode pokazale su dobre analitičke karakteristike, kao što su linearnost, preciznost i analitički povrat. Navedene su metode primijenjene za analize realnih uzoraka osvježavajućih bezalkoholnih pića i hrane za posebne prehrambene potrebe.
Ovaj rad predstavlja dvije metode za separaciju i određivanje umjetnih sladila aspartama, acesulfama K, natrijeva saharina i natrijeva ciklamata u osvježavajućim bezalkoholnim pićima i posebnim ...prehrambenim proizvodima tehnikom tekućinske kromatografi je visoke djelotvornosti (HPLC). Sva četiri analita topljiva su u vodenim otopinama i lako se mogu razdvojiti i odrediti tekućinskom kromatografi jom uz primjenu detektora s nizom dioda (DAD). Prva je metoda kromatografsko razdvajanje aspartama, acesulfama K i natrij saharina na C18 koloni izokratnim ispiranjem fosfatnog pufera i acetonitrila kao mobilne faze. Druga metoda omogućava određivanje natrijeva ciklamata na C18 koloni sa metanolom i vodom kao mobilnom fazom. Pod najpovoljnijim eksperimentalnim uvjetima obadvije metode pokazale su dobre analitičke karakteristike, kao što su linearnost, preciznost i analitički povrat. Navedene su metode primijenjene za analize realnih uzoraka osvježavajućih bezalkoholnih pića i hrane za posebne prehrambene potrebe.
This enthralling book is the first to uncover the story of New York City merchants who engaged in forbidden trade with the enemy before and during the Seven Years' War (also known as the French and ...Indian War). Ignoring British prohibitions designed to end North America's wartime trade with the French, New York's merchant elite conducted a thriving business in the French West Indies, insisting that their behavior was protected by long practice and British commercial law. But the government in London viewed it as treachery, and its subsequent efforts to discipline North American commerce inflamed the colonists.
Through fast-moving events and unforgettable characters, historian Thomas M. Truxes brings eighteenth-century New York and the Atlantic world to life. There are spies, street riots, exotic settings, informers, courtroom dramas, interdictions on the high seas, ruthless businessmen, political intrigues, and more. The author traces each phase of the city's trade with the enemy and details the frustrations that affected both British officials and independent-minded New Yorkers. The first book to focus on New York City during the Seven Years' War,Defying Empirereveals the important role the city played in hastening the colonies' march toward revolution.
With the passage of the Eighteenth Amendment, "drying up" New York City promised to be the greatest triumph of the proponents of Prohibition. Instead, the city remained the nation's greatest liquor ...market. Smugglers, Bootleggers, and Scofflaws focuses on liquor smuggling to tell the story of Prohibition in New York City. Using previously unstudied Coast Guard records from 1920 to 1933 for New York City and environs, Ellen NicKenzie Lawson examines the development of Rum Row and smuggling via the coasts of Long Island, the Long Island Sound, the Jersey shore, and along the Hudson and East Rivers. Lawson demonstrates how smuggling syndicates on the Lower East Side, the West Side, and Little Italy contributed to the emergence of the Broadway Mob. She also explores New York City's scofflaw population—patrons of thirty thousand speakeasies and five hundred nightclubs—as well as how politicians Fiorello La Guardia, James "Jimmy" Walker, Nicholas Murray Butler, Pauline Morton Sabin, and Al Smith articulated their views on Prohibition to the nation. Lawson argues that in their assertion of the freedom to drink alcohol for enjoyment, New York's smugglers, bootleggers, and scofflaws belong in the American tradition of defending liberty. The result was the historically unprecedented step of repeal of a constitutional amendment with passage of the Twenty-first Amendment in 1933.
For a decade, from 1983 to 1993, homelessness was a major concern in the United States. In 1994, this public concern suddenly disappeared, without any significant reduction in the number of people ...without proper housing. By examining the making and unmaking of a homeless crisis, this book explores how public understandings of what constitutes a social crisis are shaped. Drawing on five years of ethnographic research in New York City with African Americans and Latinos living in poverty, Where Have All the Homeless Gone? reveals that the homeless “crisis” was driven as much by political misrepresentations of poverty, race, and social difference, as the housing, unemployment, and healthcare problems that caused homelessness and continue to plague American cities.
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