1.Why do all sugars give a positive result for Molisch’s test?
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All Sugars whether aldose or ketose, comes under the category of carbohydrates. Giving Positive Molisch test is a characteristic property of all carbohydrate (e.g sugars, potatotes). That is why sugars give a positive molisch test.
260815
my son's gymnastics coach is diabetic and i have wondered the same thing. someone told me when their sugar is low they can get upset easily but i haven't seen it anywhere in writing.
526021
Molisch's Test is the reaction of 1-naphthol with carbohydrates in the presence of sulfuric acid.  Carbohydrates are oxidized in this system to furfural derivatives, which will condense with the naphthol to give a purple-colored dye.\n\nFehling's Test is for aldehydes.  Copper (II) sulfate and Rochelle's salt (potassium sodium tartrate) solutions are combined, which causes complexation of the copper with tartrate.  An aldehyde will reduce the copper (II) to copper (I), which will precipitate as Cu2O, a red solid.  Ketones do not react in this manner.
714556
The acid is used in a test for non reducing sugars. Without it, the test would come out negative, so you hydrolise the sugar produced during photosynthesis to reducing sugars (acid hydrolysis, followed by neutralisation), then perform Benedict's test. So basically the HCl hydrolises the sugar.
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The Molisch test is a general test for the presence of carbohydrates.
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There are a few things that can cause a false positive:\n· Kidney infection and diabetes can cause you to test positive for cocaine.\nDesipramine and amantadine, prescribed to reduce cravings for cocaine, may cause false-positive results on urine tests for amphetamines.\n\nHave your doctor test your blood or hair samples.
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that's so weird, we're doing something similar in my bio class...\n\nI would agree with you....glucose should be broken down faster...perhaps theres some error in ur results.\n\nI did the same experiment...and I had glucose produce a little more CO2 than sucrose.
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Both Tollen's and Benedict's reagents are used for the detection of reducing sugars/aldehydes (such as glucose).  Sucrose is a disaccharide consisting of an aldehyde (glucose) and a ketone (fructose).  \n\nIn Benedict's reagent, sucrose is not broken down into its monosaccharide components and thus elicits no reaction/color change.\n\nIn Tollen's reagent, sucrose is broken down into glucose and fructose monomers, but this process occurs very slowly.  Thus you will eventually see the reduction of silver I to silver metal (as observed visually by "mirror" formation on the reaction container) as sucrose is broken down and glucose is liberated allowing it to react.
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A) Glucose is what is known as a "reducing sugar" and can be identified by several chemical means, however you could also use an enzymatic method with a colored end product such as glucose oxidase.\n\nB) Luteinizing hormone, produced in the pituitary gland, regulates the synthesis of testosterone in the Leydig cells of the testis, it also plays an important role in the regulation of egg development and maturation in the ovaries.\n\nChemical elements? Do you mean carbon, oxygen, hydrogen, these are present in most organic compounds.\n\nIn passive immunity, you are provided with antibodies that are ready to attack an immune insult, so there is none of the lag time associated with producing the antibodies.\n\nThat's enough for now, study harder for your test!
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In September of 1974 my blood sugar was 1200+ I woke up in intensive care. I don't know if that's 'the highest' but it was enough to put me in a 7-day coma! \n\nHey killer this wasn't a glucometer, back in 1974 it probably would take 3+ minutes to get the results and anything over 250 would register "High" this test was taken by the hospital lab!
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C6H12O6 represents Glucose and Fructose. Go to http://images.google.com/images?q=Glucose%20structure
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As no one else has had a go, i will. \n\nCellulase should produce glucose, so you are needing a method to analyse the amount of glucose formed. \n\nIf you have access to a blood glucose monitor, this would be the simplest way. Otherwise, the reaction between glucose and Benedicts solution is quantitative, and you could weigh the amount of Cu2O formed.
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im a medical assistant at a drug testing facility. we have to tell people that the test in inconclusive or "non-negative" because we cant tell you that its positive. more than likely it will be if they sent it to the lab though. some medications, however, do show up (pain med, etc.). if it were diluted (too much water) it would have showed negative on a quick screen. (those only show neg or positive). e-mail me if you want to.
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The tests are to determine how much glucose there is a person's blood. Since this glucose level can change a lot in a short time, frequent testing is needed.\n\nIf glucose levels are too high or too low (hypERglycemia and  hypOglycemia, respectively) this can lead directly to problems like diabetic coma or indirectly contribute to things like microvascular damage to the eyes, the cause of eventual blindness in so many diabetics.\n\nAfter the blood glucose level is measured, usually with a home device called a glucometer, the person takes steps to bring to blood glucose level up or down so that it falls within normal range; that is, they act to restore normoglycemia. If it's too low, they can have a little snack, or in extreme cases, take a dose of concentrated sugar. If it's too high, they take a shot of insulin, a natural substance, manufactured by a healthy pancreas. Using insulin, the body can get the glucose out of the bloodstream by converting it glycogen, which is stored in the liver.
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What does the test result mean?\nHigh levels of glucose most frequently indicate diabetes, but many other diseases and conditions can also cause elevated glucose. The following information summarizes the meaning of the test results. These are based on the clinical practice recommendations of the American Diabetes Association.\n\nFasting Blood Glucose\nFrom 70 to 99 mg/dL (3.9 to 5.5 mmol/L) Normal glucose tolerance\nFrom 100 to 125 mg/dL (5.6 to 6.9 mmol/L) Impaired fasting glucose (pre-diabetes)\n126 mg/dL (7.0 mmol/L) and above on more than one testing occasion Diabetes\n\nOral Glucose Tolerance Test (OGTT)\n[except pregnancy]\n(2 hours after a 75-gram glucose drink)\nLess than 140 mg/dL (7.8 mmol/L) Normal glucose tolerance\nFrom 140 to 200 mg/dL (7.8 to 11.1 mmol/L) Impaired glucose tolerance (pre-diabetes)\nOver 200 mg/dL (11.1 mmol/L) on more than one testing occasion Diabetes\n\nGestational Diabetes Screening: Glucose Challenge Test\n(1 hour after a 50-gram glucose drink)\nLess than 140* mg/dL (7.8 mmol/L) Normal glucose tolerance\n140* mg/dL (7.8 mmol/L) and over Abnormal, needs OGTT (see below)\n* Some use a cutoff of >130 mg/dL (7.2 mmol/L) because that identifies 90% of women with gestational diabetes, compared to 80% identified using the threshold of >140 mg/dL (7.8 mmol/L).\n\n\nGestational Diabetes Diagnostic: OGTT\n(100-gram glucose drink)\nFasting* 95 mg/dL (5.3 mmol/L)\n1 hour after glucose load* 180 mg/dL (10.0 mmol/L)\n2 hours after glucose load* 155 mg/dL (8.6 mmol/L)\n3 hours after glucose load* ** 140 mg/dL (7.8 mmol/L)\n* If two or more values are above the criteria, gestational diabetes is diagnosed.\n** A 75-gram glucose load may be used, although this method is not as well validated as the 100-gram OGTT; the 3-hour sample is not drawn if 75 grams is used.\n\nSome of the other diseases and conditions that can result in elevated glucose levels include:\n\n    * Acromegaly\n    * Acute stress (response to trauma, heart attack, and stroke for instance)\n    * Chronic renal failure\n    * Cushing syndrome\n    * Drugs, including: corticosteroids, tricyclic antidepressants, diuretics, epinephrine, estrogens (birth control pills and hormone replacement), lithium, phenytoin (Dilantin), salicylates,\n    * Excessive food intake\n    * Hyperthyroidism\n    * Pancreatic cancer\n    * Pancreatitis \n\nLow to non-detectible urine glucose results are considered normal. Anything that raises blood glucose levels also has the potential to elevate urine glucose levels. Increased urine glucose levels may be seen with medications, such as estrogens and chloral hydrate, and with some forms of renal disease.\n\nModerately increased levels may be seen with pre-diabetes. This condition, if left un-addressed, often leads to type 2 diabetes.\n\nLow glucose levels (hypoglycemia) are also seen with:\n\n    * Adrenal insufficiency\n    * Drinking alcohol\n    * Drugs, such as acetaminophen and anabolic steroids\n    * Extensive liver disease\n    * Hypopituitarism\n    * Hypothyroidism\n    * Insulin overdose\n    * Insulinomas (insulin-producing pancreatic tumors)\n    * Starvation \n\n\n\n\nIs there anything else I should know?\nHypoglycemia is characterized by a drop in blood glucose to a level where first it causes nervous system symptoms (sweating, palpitations, hunger, trembling, and anxiety), then begins to affect the brain (causing confusion, hallucinations, blurred vision, and sometimes even coma and death). An actual diagnosis of hypoglycemia requires satisfying the "Whipple triad." These three criteria include:\n\n    * Documented low glucose levels (less than 40 mg/dL (2.2 mmol/L) often tested along with insulin levels and sometimes with C-Peptide levels)\n    * Symptoms of hypoglycemia\n    * Reversal of the symptoms when blood glucose levels are returned to normal. \n\nPrimary hypoglycemia is rare and often diagnosed in infancy. People may have symptoms of hypoglycemia without really having low blood
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sucrose is a non reducing sugar so it will not give a positive red result. You need to boil it with acid to hydrolyse it then it will give a positive result.
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as drsuria said, + many other sugars depend on what u eat, like for example grapes have a kind of sugar called arabinose which will increase significally in your urine if u ate them.