Question

You will examine the reactivities of the carbohydrates in Figure 8.23. In addition, choose one of the available solutions containing a mystery carbohydrate and record the sample identification code on the data sheet, page 189 Use the same mystery sample for Parts A through D. Review the proper technique for using a hot-water both in Topic 1.4, page 20. CH, OH CH OH CH,OH CH,OH CH OH CH,OH , но QUOOH OH OHO кон OW І ОН OH OH OH CHRWON D-glucose D-fructose lactose еснон CHOM sucrose CH,OH CH, OH CHOH OOO OOH OH OH OOOO OH анон онон starch 8.23 Structures of the five identified carbohydrates examined in Parts A through CHAPTER 8 Biomolecules 183

Benedict's Test

Answer 1

→ → Benedict test It i test for simple carbohydrates. it identifies reducing sugat. It is deep blue alkalide solution No colour change means reducing sugae absent. colour change Aneaus reducing sugas present- - > prediction Reducing sugar ) No change change (Red) t. Distilled water . 2- Glucose 3- fructose 4- suerose 5- Lactose 6- starch 7- Mystery change (Red) TIZI No change change (Red) y Ş By observation Not by structure? sample → prediction is expected result based on - structure → concept for prediction reducing sugal . sugar that is capable of lacting as reducing agent because it has a free aldehyde group of Kefonic group in structure.