Astanga Hrudaya
स्वादुः पटुश्च मधुरमम्लोऽम्लं पच्यते रसः। तिक्तोषणकषायाणां विपाकः प्रायशः कटुः॥२१॥
Types of Vipaka- There are three types of Vipaka (taste conversion after digestion). Swadu (sweet) and Patu (salt) tastes undergo Madhura Vipaka (sweet). Sour remains as sour itself – Amla – Amla Vipaka (taste conversion after digestion) Tikta (bitter), Ushna (pungent) and Kasaya (astringent) tastes will generally be Katu Vipaka (pungent). So, generally, sweet and Salt tastes get converted into sweet taste Sour remains as sour and Bitter, pungent and astringent convert into pungent.
english translation
svAduH paTuzca madhuramamlo'mlaM pacyate rasaH। tiktoSaNakaSAyANAM vipAkaH prAyazaH kaTuH॥21॥
hk transliteration by Sanscript