Central composite design (CCD) approach to develop HPLC method for caffeine: Application to coffee samples analysis of Jazan region, Saudi Arabia by Asim Najmi, Zia ur Rehman, Khalid Zoghebi, Hassan Ahmed Alhazmi, Mohammed Mofarreh Albratty, Qasem Yahya Hassan Haroobi, Ismail Mohammed Ali Sayram, Mohammed Ahmed Saleh, Waleed Mohammed Ahmed Qaser, Abdulaziz Ali Houssein Qaysi

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