29 Questions 17 Answers 0 Followers
Questions related from Mahsa Ostadgholami
Hi every body How can I determination Minoxidil and minoxidil oxothiazolidine carboxylate in hair growing? please introduce a extraction method. I use HPLC-DAD for instrument analysis.
04 May 2025 537 0 View
Hi everyone Is there any guideline for method validation for cosmetic? I wanna know about criteria for that.
01 June 2024 2,247 2 View
Hi Have a nice day I want to determination PAAs and PAHs in tatoo. Would you present and introduce methods to this?
03 April 2024 6,837 0 View
Hi every body responce of my HPLC decreased. I think , UV cell detector is dirty. How can I I Wash UV cell detector? I washed Whole HPLC with Water, water+methanol and methanol. Are there any way...
28 February 2024 7,125 3 View
Hi I'm new to cosmetics analysis and looking for cheats for these products. I need information today about illegal preservatives used in cosmetic shampoos and creams. I know that preservatives...
13 February 2024 9,191 2 View
I am in the process of setting up a method for determination nitroso diethanolamine in shampoo. This method is performed using derivatization and post-column with HPLC device and UV detector. I...
07 February 2024 9,083 9 View
Hi everyone I want to determination 16 PAHs in edible oil by GC-MS. But for this reason that matrix is so difficult, I can't have a good recovery and sensitivity. Please introduce methods for...
03 January 2023 6,575 4 View
Hi everyone I need couple of valid, helpful and easy references (video or book) to learn principles of High Resolution mass spectrometry. please help me to find those. thanks
22 August 2022 8,553 0 View
Hello everybody I am going to extract MCPD in oil ,but I havent pressurized liquid extraction. How can I extract MCPD in oil and determination with GC-MS?
21 December 2020 7,644 2 View
Hi, everybody, My GC-MSMS instrument (Agilent 7000) shows the following error at 20-40 minutes after beginning run: "QQQ Fault Detected: 3.12 Collision Cell RF Driver Cannot Maintain the Request...
21 December 2020 3,557 3 View
01 January 1970 6,444 3 View
Hello everybody I'm going to deterination PAHs in oil. but my recoveries are very bad. levels of spike is 2 ng/g sample and method of extraction is base on modified QuECheRS . my solvents for...
01 January 1970 965 3 View
01 January 1970 4,017 4 View
Hi every one How can I determination Formaldehyde in Shampoo by HPLC or LC-MSMS?
01 January 1970 777 8 View
Hi everybody could you introduce guideline about method validation for cosmetic.
01 January 1970 2,144 4 View
Hi everyone I am in the process of setting up a method for determination nitrosoethanolamine in shampoo. This method is performed using derivatization and post-column with HPLC device and UV...
01 January 1970 530 3 View
Extract and determination PAAs and PAHs in tatoo Hi Have a nice day I want to determination PAAs and PAHs in tatoo.
01 January 1970 5,441 0 View
I'm new to cosmetics analysis and looking for cheats for these products. I need information today about illegal preservatives used in cosmetic shampoos and creams. I know that preservatives such...
01 January 1970 2,415 1 View
Hi everyone How can I determination peroxides in lipstick?
01 January 1970 5,299 1 View
Hi everyone How can I determination of methyl salicylate in massage gel?
01 January 1970 3,428 2 View
Have a good day How can I determination Bimatoprost in Eyelash Enhancing Cosmetic Serums?
01 January 1970 5,187 0 View
Hi everyone I have a control and evaluation laboratory for cosmetic products. In this laboratory, I will identify frauds in cosmetic products. What test setup and methods do you recommend?
01 January 1970 9,203 0 View
Hellow everybody I am going to extraction PAHs in oil with QuEChERS method or modified of it. please suggest a valid method to me. thanks
01 January 1970 2,980 0 View
01 January 1970 4,670 0 View
Hi everybody, My GC-MS-MS instrument (Agilent 7000) shows the following error at 20-40 minutes after beginning run: "QQQ Fault Detected: 3.12 Collision Cell RF Driver Cannot Maintain the Request...
01 January 1970 1,247 3 View
Hi Every body I want to detect Peroxide value. I use this method: Procedure The sample has to be protected from the air, stored in a cool place and should not be opened before the onset of the...
01 January 1970 2,328 5 View
Hi Every body I want to determination Minoxidil and minoxidil oxothiazolidine carboxylate in hair growing. Introduce a method by HPLC-DAD or UV.
01 January 1970 3,278 2 View
Hi every body I want to determination phenoxyethanole in mascara by HPLC-DAD. How can I remove Black color from matrix in extraction. Please introduce method for extract, detect and determination.
01 January 1970 9,860 2 View
I study about determination 16 PAHs in oil by GC-MS and column is HP5-MS
01 January 1970 2,885 9 View
