Effect of Thymoquinone Extracted From Nigella Sativa in the Treatment of Arsenical Keratosis

Effect of Thymoquinone Extracted From Nigella Sativa in the Treatment of Arsenical Keratosis


Lead Sponsor: Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh

Source Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
Brief Summary

Prepare an ointment from Nigella sativa seeds extract and apply it over palmer arsenical keratosis patient for 12 weeks. After than the effect of the ointment will be observed by measuring the keratotic nodular size before and after the intervention.

Detailed Description

Arsenicosis is a massive public health problem affecting thousands of people worldwide, especially India, West Bengal, and Bangladesh. In our country groundwater of estimated 59 administrative districts have been contaminated with high concentration of arsenic. Through this contaminated drinking water a large number of populations are chronically exposed to high concentration of arsenic. Arsenicosis is characterized by diffuse melanosis followed by hyperpigmentation and keratosis. Keratosis causes reduce working capacity that affects socioeconomic condition of the patient. Invasive skin lesions like squamous cell carcinoma, Bowen's disease, and basal cell carcinoma also caused by it. Keratosis can treated by several topical preparation like propylene glycol, salicylic acid, alpha-lipoic acid, neem leaf extract, solanum melongena extract, Azadirachta indica and oral preparation like zinc, antioxidant, and folic acid. This treatment procedure required longer time to relieve symptom and reduce patient's compliance. Nigella sativa is a well-known spice of Southeast Asia, especially in Bangladesh. It contains a yellow volatile oil, a fixed oil, protein, amino acid, reducing sugars, alkaloids, and minerals like potassium, sodium, phosphorus, and iron while zinc, magnesium, calcium, copper, and manganese are found in low level. Thymoquinone is a main pharmacologically active constituent of volatile oil of N. sativa. Other constituents of the volatile oil are thymol, thymohydroquinone, and dithymoquinone. These biologically active compounds possess antimicrobial, anti-inflammatory, antioxidant, immunological, antimetastatic, anti-diabetic activity. Study with Nigella sativa in the treatment of arsenical keratosis was done and found effective. Therefore, the study will be done to identification of compound that is isolated from Nigella sativa and its effect on moderate to severe arsenical keratosis. . After obtaining clearance from IRB, on the basis of selection criteria, 34 patients of arsenical keratosis will be enlisted from Bhanga Upazilla of Faridpur district, an arsenic affected area. The study will be an experimental study and conducted in Bangabandhu Sheikh Mujib Medical University. Nigella sativa extract will be collected by using n-hexane as a solvent and rotary evaporator. Thin Layer Chromatography (TLC), Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectrometry of the extract will be done to identify compound. Cytotoxicity test of the extract will be analyzed by using brine shrimp bioassay. . Then a topical ointment will be prepared from Nigella sativa extract and supplied to the arsenical keratosis patient at two weeks interval. Instruction about the application of the ointment on keratotic lesion will be given to the patients. Adherence and side effects of the ointment will be monitored at regular interval over phone calls and during field visit. Keratotic nodular size will be measured before start and after completion of treatment. Photograph will also take before and after treatment. Improvement of the lesion will be measured by mean scoring of nodule and perception of patients about their improvement by using Likert Scale. Statistical analysis and results will be presented in tabulated forms and in different diagrams.

Overall Status Recruiting
Start Date 2019-10-20
Completion Date 2021-02-20
Primary Completion Date 2021-01-20
Phase N/A
Study Type Interventional
Primary Outcome
Measure Time Frame
Keratotic nodular size 12 weeks
Enrollment 34

Intervention Type: Drug

Intervention Name: Nigella sativa seeds extract containing ointment intervention

Description: Nigella sativa seeds extract containing ointment Nigella sativa seed extract, bee wax, white petrolatum, stearyl alcohol

Arm Group Label: Nigella sativa seeds extract containing ointment intervention



Inclusion Criteria: - Age: 19 - 65 years - Arsenical keratosis: Presence of moderate to severe keratosis (>5 mm) in both palms or soles - Drinking arsenic-contaminated water (>50 µg/ L) for at least more than six months - Patient did not receive topical application of any drug for the last three months - Patient agreed to participate voluntarily - Patient who understood the instruction of applying drug and could apply drug as per an instruction Exclusion Criteria: - Age <19 and >65 years - Pregnant and nursing mother - Patient who received any treatment of arsenicosis within the last three months - Patient with skin diseases like atopic dermatitis, eczema, and psoriasis - Any systemic disease, inflammatory disease and infectious condition that affected the skin, for example, diabetes mellitus, rheumatoid arthritis, systemic lupus erythematosus and hepatitis - Food allergy to Nigella sativa



Minimum Age:

19 Years

Maximum Age:

65 Years

Healthy Volunteers:


Overall Official
Last Name Role Affiliation
Bangladesh Bhanga, Faridpur Principal Investigator Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
Overall Contact

Last Name: Farhana Nargis, MBBS

Phone: 01717512743

Email: [email protected]

Facility: Status: Contact: Bhanga Farhana Nargis, MBBS 01717512743 [email protected]
Location Countries


Verification Date


Responsible Party

Type: Principal Investigator

Investigator Affiliation: Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh

Investigator Full Name: Dr. Farhana Nargis

Investigator Title: MD, Resident

Has Expanded Access No
Condition Browse
Number Of Arms 1
Arm Group

Label: Nigella sativa seeds extract containing ointment intervention

Type: Experimental

Description: Nigella sativa seeds extract containing ointment dose- twice daily for 12 weeks

Patient Data No
Study Design Info

Allocation: N/A

Intervention Model: Single Group Assignment

Primary Purpose: Treatment

Masking: None (Open Label)

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