Cartridge and image forming apparatus

A cartridge comprising:

• a toner;
• a developing roller carrying on a surface thereof the toner;
• a developer container rotatably supporting the developing roller;
• a toner accommodating portion accommodating the toner;
• a supply member abutting the surface of the developing roller and supplying the toner from the toner accommodating portion to the surface of the developing roller;
• and
• a regulating member abutting the surface of the developing roller and regulating the toner carried on the surface of the developing roller, wherein
• the cartridge comprises a first supply electrode to which a voltage is supplied from outside of the cartridge,
• the supply member and the regulating member are electrically connected to the same first supply electrode,
• the toner comprises a compound A having a structure represented by Formula (1) below,
• —(CH2CH2O)— (1)
• the compound A is eluted in methanol when elution treatment of the toner is carried out under an elution condition A below, and
• in a case where a supernatant obtained by centrifuging an eluate of the compound A eluted in the methanol under a centrifugation condition A below is analyzed within a range of m/z=50 to 1500 by liquid chromatograph ESI/MS,
• a reference peak defied as follows is present, and
• an average m/z defined as follows is 300 to 1000:
• Elution condition A:
• Methanol (a product equivalent to JIS K8891) in an amount of ten times that of the toner by mass is used, and a mixture thereof is stirred at 25° C. at a rotor rotation speed of 200 rpm for 10 hours with a stirring apparatus;
• Centrifugation condition A:
• Rotation is performed with a rotation radius of 10.1 cm and a rotation speed of 3500 rpm at 25° C. for 30 minutes;
• Reference peak:
• A relative abundance is obtained on the assumption that an abundance of a peak of the highest strength in a mass analysis spectrum obtained by liquid chromatograph ESI/MS of the supernatant is 100%;
• peaks are chosen in a descending order of the relative abundance, and a m/z value of a peak top of the chosen peak is defined as P;
• and a chosen peak with the highest relative abundance is defined as the reference peak from among the chosen peaks including peaks with a relative abundance of not less than 10% and with m/z values of P +44 or P −44 at peak tops;
• Average m/z:
• The m/z value at the peak top of the reference peak is defined as Ps, the m/z value at the peak top=Ps+44n (n is an integer), and an average value of m/z at peak tops of peaks with a relative abundance of not less than 30% is defined as an average m/z.