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Starch: Physical and chemical tests / Analysis of crude drugs

Background

Amylose forms a colloidal dispersion in hot water whereas amylopectin is completely insoluble. The structure of amylose consists of long polymer chains of glucose units connected by an alpha acetal linkage. Starch – Amylose shows a very small portion of an amylose chain. All of the monomer units are alpha -D-glucose, and all the alpha acetal links connect C #1 of one glucose and to C #4 of the next glucose. As a result of the bond angles in the αacetal linkage, amylose actually forms a spiral much like a coiled spring. See the graphic below, which shows four views in turning from the side to an end view

Chemical Test for Starch or Iodine

Amylose in starch is responsible for the formation of deep blue colour in the presence of iodine. The iodine molecule slips inside of the amylose coil. Iodine – KI Reagent: Iodine is not very soluble in water; therefore the iodine reagent is made by dissolving iodine in water in the presence of potassium iodide. This makes a linear triiodide ion complex with is soluble and slips into the coil of the starch causing an intense blue-black colour.

CONCLUSION

From the above morphological characters and chemical tests, the crude drug is identified as starch.

REFERENCES

Kokate CK. Practical Pharmacognosy, 4 edition, VallabhPrakashan. Delhi; 1994: 98


Second Year B Pharm Notes, Syllabus, Books, PDF Subjectwise/Topicwise

S Y B Pharm Sem IIIS Y B Pharm Sem IV
BP301T Pharmaceutical Organic Chemistry II TheoryBP401T Pharmaceutical Organic Chemistry III Theory
BP302T Physical Pharmaceutics I TheoryBP402T Medicinal Chemistry I Theory
BP303T Pharmaceutical Microbiology TheoBP403T Physical Pharmaceutics II Theory
BP304T Pharmaceutical Engineering TheoryBP404T Pharmacology I Theory
BP305P Pharmaceutical Organic Chemistry II Practical BP405T Pharmacognosy I Theory
BP306P Physical Pharmaceutics I PracticalBP406P Medicinal Chemistry I Practical
BP307P Pharmaceutical Microbiology PracticalBP407P Physical Pharmaceutics II Practical
BP308P Pharmaceutical Engineering PracticalBP408P Pharmacology I Practical
BP409P Pharmacognosy I Practical

Suggested readings

  • Iodine Gargle Pharmaceutics I Practical
  • Preparation and standardization of Potassium permanganate standard solution
  • Paracetamol Tablet Pharmaceutics Lab Manual PDF
  • Preparation and evaluation of Paracetamol tablets: Industrial Pharmacy
  • Preparation and evaluation of Aspirin tablets

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B Pharmacy Notes (Subjectwise/Topicwise)

  • F Y B Pharmacy Notes
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  • T Y B Pharmacy Notes
  • Final Year B Pharmacy Notes
  • B Pharmacy All Subject Notes

D Pharmacy Notes (Subjectwise/Topicwise)

  • 1st Year D Pharmacy
  • 2nd Year D Pharmacy

  • Disease
  • Drugs
  • Jobs
  • News
  • pharma events
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  • ups and battery




  • Bharat Parenterals Ltd Jobs
  • Ellicium Solution Freshers Job
  • Straive Life Science Freshers jobs
  • Imeg Engineering (India) Pvt Ltd Walk in interview
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Telegram Groups

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  • F Y B Pharm: t.me/fybpharmnotes
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